16 March 1998

42 1697 05

The information in this datasheet is subject to change

SBPH400-3

IEEE1394 3-Port 400Mbps Physical Layer

PRELIMINARY DATA

FEATURES

3 ports fully compliant with IEEE 1394-1995
cable environment specification

Fully

implements

IEEE

P1394a

D2.0

proposal

S100, S200 and S400 speeds

IEEE P1394a proposal PHY-LINK interface

IEEE P1394a proposal Suspend/Resume

OHCI support

Per port disable

Automatic power saving

Optional isolation support

IEEE

P1394a

proposal

arbitration

enhancements

IEEE P1394a proposal register set and
remote register read

Advanced

Data-Strobe

clock

and

data

recovery

Digital

delay-lock

loop technology

- no

filtering capacitors

Built-in self-test (BIST) of analog and digital
port logic

JTAG Test Access Port

3.3V supply

80 pin plastic TQFP package

APPLICATIONS

Host processor interface

Host processor adapter cards

Digital set-top box

Digital Video Recorder/ Player

Repeaters

1394 cable

interface

@400 Mbps

Port

logic

Port

logic

Port

logic

Reset and

arbitration

Link layer interface logic

P1394a Link interface

1394 cable

interface

@400 Mbps

1394 cable

interface

@400 Mbps

Built-in

self test

2/43

Table of Contents

1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.1

Transmitter and receiver port interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.2

Connect detect and bias . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.3

Configuration pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.4

Suspend/Resume/Disable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.5

Data encoder/decoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.6

Bus reset, arbitration and control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2.7

PHY packets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2.7.1

Link device interaction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2.7.2

Self-ID packet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2.7.3

Link_on packet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2.7.4

PHY configuration packet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2.7.5

Ping packet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2.7.6

Remote Access and Reply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

2.7.7

Remote Command and Confirmation packets . . . . . . . . . . . . . . . . . . . . . . 14

2.8

Link interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

2.8.1

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

2.8.2

Types of operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

2.8.3

Control pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

2.8.4

Link device request (LREQ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

2.8.5

Bus request . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

2.8.6

2.8.7

Status transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

2.8.8

Transmit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

2.8.9

Receive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

2.8.10 SBPH400 registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

2.9

Reset and initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

2.9.1

Power on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

2.9.2

PHY/Link Interface start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

2.9.3

PHY/Link interface reset and disable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

2.9.4

LKON (link on) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

2.10 ISO (isolation) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

2.11 CPS (cable power status) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

3 Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

3/43

Table of Contents

4 Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

4.1

Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

4.2

Operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

4.3

DC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

5 AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

6 Package Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

7 Application Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

4/43

SBPH400-3

Overview

The S B P H 4 0 0-3 provides the analog transceiver functions needed to implement a 3 port
node in an IEEE 1394-1995 cable network. There are 2 differential line transceivers in each
cable port. The following main functions are included in the chip:

Detection of connection status using line condition detection circuitry.

Node initialization and bus arbitration.

Reception and Transmission of Data Strobe Bit Level encoded packets

Interface to higher level protocol devices (Link layer).

Production test through JTAG

The interface to the Link conforms to the IEEE 1394-1995 Annex J with 2 control lines and an
8 bit data bus, as modified by the P1394a proposals.

The basic chip timing may be controlled either from a 24.596 MHz crystal controlling an
internal oscillator or from an external 24.596 MHz oscillator. The internal delay lock loop (DLL)
generates the various internal clocks for the high speed serial data transmission and
reception. Note that there is no need to provide filtering capacitors. The input clock is used to
derive the 49.152 MHz clock for the interface to a Link layer device, which provides the data
to be transmitted on the 8 bit Link data interface. The data from the Link layer device is latched
internally in the chip at 49.152 MHz. The bits are serialized and encoded in the Data Strobe
Bit Level Encoding format. The Data information is transmitted differentially on the TPB cable
pair(s) while the Strobe information is transmitted differentially on the TPA cable pair(s). Data
can be transmitted at 98.304 Mbit/s (S100 speed), 196.608 Mbit/s (S200 speed) or 393.216
Mbit/sec (S400 speed). When a packet is received by a port, the corresponding transmitters
are disabled and the receivers enabled. The received encoded Data information from TPA
cable pair and the encoded Strobe information from the TPB cable pair are decoded to extract
the receive clock signal and the data bits. The data bits are converted into a parallel format
and transmitted to the Link Layer controller and the other active cable ports after
resynchronisation to the system clock.

Figure 1.1 is a block diagram of the SBPH400-3. The portion of circuit which is circled by the
dash line is termed the

Cable Media Interface. All signals between the Digital Circuit and the

Cable Media Interface are pure digital signals. The signals which are driven on and received
from the cable are analog differential and common mode signals. The differential signals on
the cable transmit data or arbitration states, while common mode signals indicate the cable
connection status or transmission rate (speed).

6/43

SBPH400-3

Functional Description

2.1

Transmitter and receiver port interface

Figure 2.1

Analog port schematic

The SBPH400-3 implements three cable interface transceiver ports. Each port operates
independently from the other ports, under control of the device control logic. Each port
provides two pairs of signals, denoted TPA, TPA#, and TPB, TPB#. Each signal is
implemented using a driver and a receiver connected to a single pin (total of four pins per port).
In various modes, the driver and receiver are enabled, either separately or both at the same
time (for bi-directional signalling).

Strb_ Tx

Strb_ Ena ble

Da ta_Rx

7 k

5 5

Twisted Pair A

Twisted Pair B

TPA

TPA*

TPB

TPB *

T pB ia s '

0. 3

m in

D riv e r

R ec eiv er

Arb_A_Rx

A rbitr ation

C o m pa ra to rs

S 20 0 _ref

S20 0

Da ta _T x

Da ta _Enab le

Strb _ Rx

A rb itra tion

C om p arator s

Arb _ B_Rx

Bia s

0.8V

C o m m o n m o d e sp ee d
s ig na l c u rren t

5 k

5 %

25 0 pF

(sh ared with TPA
a nd othe r p orts)

7 k

T pB ia s de te c tion c o m pa rato r

Ph ys ic al con ne c tio n
de te ction c o m pa rato r

Con

Tp Bia s d isa ble

S4 00 _r ef

S40 0

Spe e d_T x

S4 00
Sp ee d_T x

S20 0
Spe ed _Rx

Spe ed_ Rx

SBPH400-3

7/43

A port may be disconnected, disabled, suspended or active. When active, each port operates
in the following modes:

Idle mode: In this mode, each port's driver is disabled, i.e. the port presents a high impedance
on all four signals. The inputs are continuously sampled, and if a signal is detected (which will
normally indicate an arbitration signal from a connected port) then this is passed to the
arbitration logic.

Arbitration mode: In this mode, both pairs engage in bi-directional untimed digital signalling.
Each pair transmits (under the control of the arbitration logic) either a logic 1 using differential
signalling, a logic 0 using differential signalling, or high impedance Z. Simultaneously, the
signal on each pair is continuously sampled, and is interpreted as a logic 1, logic 0 or high
impedance Z. The sampled signal is a combination of the transmitted signal and the signal
being transmitted on the corresponding pair by a connected transceiver (NB the cable
implements a "twist" - TPA is connected to the far end TPB, and vice versa). The signal is
interpreted using the 1394 1's dominant rule and passed to the arbitration logic for
interpretation by the arbitration state machine. If a 11 level is received then this is interpreted
as a reset signal and passed to the control logic.

Speed signalling mode: Speed signalling uses common mode signalling. It is used to signal
the transmission speed capabilities of the device (during the Self_ID phase of bus initialization)
and in parallel with the transmission of Data_Prefix arbitration signal during arbitration to
indicate the speed of the packet about to be transmitted. To send a speed signal, the port
generates a common mode current signal on TPB and TPB# for 100 ns. This signal results in
a drop of the current mode bias voltage through a pair of 55 Ohm resistors connected between
the TpBias output and the TPA, TPA# pair at the receiving end. To receive a speed signal, the
port determines the speed by measuring the amount of voltage drop on the TPA pair,
compared to the TpBias signal it is generating. The port samples the speed signal at 20ns
intervals in order to provide filtering against intermediate values or against noise. The
SBPH400 requires two consecutive samples of a S200 or a S400 signal (as appropriate) in
order to identify a valid speed signal. If no speed signal is identified when data transmission
starts, then the data is assumed to be transmitted at S100 speed.

Data transmission mode: In this mode, which always follows arbitration mode, the port
transmits the data and strobe signals received from the data encoder on the TPB pair and the
TPA pair respectively. The transmission uses uni-directional differential data signalling on
each pair. Note that at the end of arbitration mode, the port will be transmitting an untimed
signal of 01. If the first bit to be transmitted is a zero, then this will cause a transition on "data"
(i.e. TPB, so that TPA, TPB transmit 00), if the first bit to be transmitted is a 1, then this will
cause a transition on "strobe" (i.e. TPA, so that TPA, TPB transmit 11). The receivers are
disabled during data transmission. At the end of data transmission mode, the port reverts to
idle mode.

Data reception mode: This mode always follows arbitration mode. The port presents high
impedance on its output drivers (and ignores the data which is being repeated to the other
ports by the data encoder/decoder). The port implements a differential receiver for each of
TPA (data) and TPB (strobe) pairs, and passes the received binary signals to the data

8/43

SBPH400-3

decoder. Advanced logic is used to ensure reception of the Data and Strobe signals at speeds
of up to 400 MHz.

2.2

Connect detect and bias

A low current connect detect circuit is used to detect a physical connection. A current, applied
to the TPA pair and sensed via a local Schmitt trigger, will indicate a disconnected state unless
there is a physical connection to ground via the 5K resistor connected to the TPB pair at the
far end. Note that this does not require the far end to be powered. This mechanism operates
only when the port is not generating TpBias.

In order to implement the cable detection, suspend/resume and speed signalling functions, a
common mode bias voltage has to be provided to the TPA pair. A separate TpBias pin is
provided for each port, which should be connected to the TPA pair via a pair of 55 Ohm
resistors, as shown in Figure 2.1. The use of a separate pin for each port avoids problems of
possible interference between the common mode signalling on each port, or possible mis-
detection of a disconnect.

A single external resistor should be provided between pins R0 and R1 in order to set the
internal operating and the cable driver output currents. A low TCR 3K

1% resistor should

be used.

2.3

Configuration pins

The SBPH400 provides six configuration pins which may be hard wired high or low, or may be
directly controlled from a link layer device. Four of the pins are used to initialize registers which
control configuration status bits in the self identification packet.

The PC[0:2] pins provide the power reset value for the power class register, which is reported
in the Self_ID packet in the pwr field.

The CMC pin provides the power reset value for the C register, with is reported in the Self_ID
packet in the C field to indicate if the node is a contender for the bus or isochronous resource
manager.

The LACT pin is used to initialize the value of the Link_active register on power reset. If set to
zero, this allows the node to appear as having an inactive link (the L field in the Self-ID packet
will be zero) until application software sets the Link_active bit to 1.

The PDISABLE pin is used to initialize all ports as disabled on power reset. This satisfies the
OHCI requirement, and allows software to be initialized before the device starts to participate
on power-on as a new device on the bus.

The ISO pin is used on power reset to determine the operating mode of the PHY/Link interface
(DC coupled or using a DC isolation barrier).

The SBPH400 also has a number of pins which are intended for use during production test
only, and are held to ground or V

as appropriate in normal operation.

SBPH400-3

9/43

2.4

Suspend/Resume/Disable

Each port independently implements the P1394a suspend/resume proposal. At any one time,
a port may be disconnected, disabled, suspended or active.

On power reset, if PDISABLE = 0 then all ports are initialized as disconnected, and then, if any
ports are physically connected, the normal new connection actions taken. If PDISABLE = 1
then all ports are initialized as disabled.

When a port is not active, the TpBias output for the port is disabled, all outputs of the port are
set to high impedance and any incoming arbitration signals on TPA and TPB are ignored.

A port may be disabled or re-enabled by a command (register write) from the local link, or by
remote PHY command packet. While disabled, the port ignores any incoming TpBias signal
but the port continues to monitor its connection status using the connect_detect mechanism.
A change in connection status will cause an interrupt to the link or a LinkOn packet as
appropriate and according to the controlling flags. When re-enabled and connected, the port
is treated as suspended (see below).

When disconnected, a port ignores any incoming TpBias signal but continuously monitors the
connection status using the connect detect circuitry. On connection, the port attempts to
become active, but if an incoming TpBias is not then detected, then the port is suspended with
the fault bit set.

While active, the port continuously senses the common-mode bias input voltage on the TPB
pair. The presence of a bias voltage on the TPB pair indicates that the port is connected to an
active port on some other device. Similarly, the absence of a bias voltage indicates the lack of
such a connection or that the far end port has been powered off. On detection of loss of bias,
the port is treated as suspended (see below)

A port may be suspended by a remote PHY command packet. In this case, it engages in a
protocol with the remote connected port, resulting in that port too being suspended. It may be
suspended on loss of incoming TpBias on an active port. A port may also be suspended as a
result of its active connected port being suspended. A connected disabled port is treated as
suspended when re-enabled.

While suspended, the port monitors both TpBias and its connection state using the
connect_detect mechanism. If a disconnection is detected, then the port becomes
disconnected. If a TpBias signal is detected, then the port resumes to its active state. A port
may be instructed to resume by means of a remote command packet, in which case it
generates a TpBias signal. This will indicate to the connected peer port that it too should
resume.

It should be noted that any change of port state to or from the active state has the effect of a
topology change, and that reconfiguration of the bus is necessary. To ensure that this occurs,
the SBPH400 initiates the appropriate bus resets as defined in the P1394a proposal.

When a port becomes disconnected, disabled or suspended, it carries out the appropriate
actions and then automatically enters a low power mode. Normal operation (on full power) is
restored after an appropriate delay (to allow the internal clocks to stabilize) on any change in

10/43

SBPH400-3

port state. If all ports are in a low power state, and the PHY/Link interface is disabled, then the
SBPH400 implements the necessary delays to allow the SBPH400 core to enter a low power
state in future versions with no functional or timing change.

2.5

Data encoder/decoder

The data encoder/decoder implements the SGS-Thomson patented "Data/Strobe" clock
encoding technique, as described in the 1394 specification. Data to be transmitted is serialized
and encoded into the appropriate Data and Strobe signals. These are send simultaneously to
all active ports for outputting. All output is clocked by the SBPH400 clock derived from the local
crystal. Note that data to be transmitted may be received from an incoming port, or from the
link interface.

Data received from a port (only at most one port can be receiving data at any one time) is
resynchronized to the local clock using a small elastic buffer, as the clock frequency of the
incoming data may differ (by up to 200 ppm) from the local clock. The buffer is sized to avoid
underflow or overflow for the longest possible packet.The data is repeated to the ports and to
the link layer as described above, using the local reference clock.

2.6

Bus reset, arbitration and control

The SBPH400 enters bus reset on power reset, if the reset signal is sensed on any connected
port's arbitration signal lines, on a request from a link layer device, on resume from suspend
or on connection of detection on any port (possibly after a delay, to allow for an incoming
reset), on loss of TpBias on an active parent port, on entry to suspend as a result of the peer
port being suspended or disabled, or if the device stays in any state other than Idle, Tree-ID
start, Transmit or Receive for longer than 300

sec. In some circumstances, the device will

arbitrate for the bus before generating a reset signal, as defined in the P1394a proposal. This
results in minimum disruption to high priority traffic.

On entry to reset, the arbitration control logic enters a Tree-ID phase. Either the node will be
identified an isolated node, or the node will be identified as the root, and all active ports will be
identified as child ports, or one active port will be the port to the node's parent, and the other
active ports will be identified as child ports.

The control logic will then engage in Self-ID, in which all nodes are allocated a node-ID and
exchange self-ID packets (see 2.7.2). All received self-ID packets are passed to the link layer
device. Speed capabilities are exchanged during the Self-ID process with all connected active
nodes.

In normal operation, the control logic implements the functions of the root, should the result of
the Tree-ID process be that this node becomes the root.

The control logic accepts arbitration requests from either the local link or any port. Upon receipt
of an arbitration request, the request is accepted locally (if the node is the root) or repeated
towards the root node via the parent port. Data Prefix (01) is transmitted on all other ports,
which indicates that any arbitration request from these ports is rejected.

SBPH400-3

11/43

If the request for transmit comes from the local link, then the arbitration control logic waits for
an appropriate gap (all interfaces Idle), and then (unless the request is an immediate request)
arbitrates as above.

The arbitration logic supports all the arbitration enhancements specified in IEEE P1394a:-

arbitrated reset (a short reset which is delayed until a subaction gap arbitration)

ack-accelerated arbitration (immediate arbitration after an ACK)

fly-by arbitration (concatenation of packets after a packet received from a child

port)

2.7

PHY packets

2.7.1 Link device interaction

The SBPH400 will forward to the link (if the PHY/Link interface is active) every PHY packet
received on the bus.

The SBPH400 will interpret every PHY packet which it receives from the local link device for
transmission on the bus (in addition to responding to every PHY packet received from the bus).
The SBPH400 will act on it in exactly the same way as if the packet was received from the bus.

2.7.2 Self-ID packet

The Self-ID packet has the following format:

Figure 2.2

Self-ID packet format

1 0

phy_ID

0 L

gap_cnt

pwr

logical inverse of first quadlet

rsv

12/43

SBPH400-3

The fields in the Self-ID packet are derived as shown in Table 2.1.

2.7.3 Link_on packet

The SBPH400 will respond to a Link_on packet addressed to it received on the bus. The
packet has the following format:

Figure 2.3

Link_on packet format

If the logical AND of the LPS pin and the Link_active bit is zero, then the SBPH400 will
generate a 6.144 MHz signal on the LKON pin, until this logical value becomes 1. Otherwise
the packet is forwarded to the local link. Note that all Link_on packets received on the bus are
forwarded to the local link if it is active, whether or not the packets are addressed to the local
node.

2.7.4 PHY configuration packet

The SBPH400 will respond to every PHY configuration packet which it receives on the bus, or
from the link device for transmission on the bus. The packet has the format shown in Figure
2.4:

Table 2.1

Self ID packet fields

Field

Derived from

Comment

phy_ID

self-ID process or
set_PHY_ID packet

physical node identifier

Link enabled register

Logical AND of LPS signal and the Link_active register

gap_cnt

Gap_Count register

current value of Gap Count register

Max_Phy_Speed

10b (S100, S200 and S400 capable)

rsv

(reserved)

00b

Contender register

current value of C register

pwr

Power class register

current value of Power class register

p0, p1 p2

port status for port 0, 1 and
2 respectively

01 - not active (disabled, disconnected or suspended)
10 - active and connected to parent node
11 - active and connected to child node

initiated reset

set whenever the node initiated the current bus reset

0 1

phy_ID

logical inverse of first quadlet

0000

SBPH400-3

13/43

Figure 2.4

PHY configuration packet format

The fields in the PHY configuration packet are interpreted as shown in Table 2.2.

Note that either or both of R and T must be set to 1.

2.7.5 Ping packet

The SBPH400 supports the use of ping timing. The ping packet has the format shown in Figure
2.5:

Figure 2.5

Ping packet format

When the SBPH400 receives a ping packet from the bus or from the local link addressed to
the node, it responds immediately (without arbitration) with a Self_ID packet to both the bus
and the local link.

2.7.6 Remote Access and Reply

The SBPH supports remote access to its internal registers. On receipt of a remote access
packet addressed to the node (either from the bus or from the local link), the SBPH400 will
immediately respond with the appropriate remote reply packet. The remote access packet and
the reply packet are also forwarded to the local link.

Table 2.2

PHY configuration packet fields

Field

Definition

Comment

root_ID

physical ID

the physical node identifier of the node to become root on next reset

set root

The Force_Root bit in the SBPH400 is set if R=1 and root_ID = the
node_ID of this node

set gap count

If T=1, then the value of the gap count register in the SBPH400 is set
to gap_cnt.

gap_cnt

Gap_Count value

new value of Gap Count register

0 0

root_ID

logical inverse of first quadlet

0000

gap_cnt

0 0

phy_ID

logical inverse of first quadlet

0000

type (0)

14/43

SBPH400-3

Figure 2.6

Remote access packet format

Figure 2.7

Remote reply packet format

The fields in the remote access and remote reply packets are interpreted as shown in Table
2.3.

2.7.7 Remote Command and Confirmation packets

The SBPH400 responds to remote command packets by initiating the appropriate action and
immediately sending a remote confirmation packet.

Figure 2.8

Remote command packet format

Table 2.3

Remote Access and Remote Reply packet fields

Field

Comment

phy_ID

Physical node identifier of the destination of the packet (type = 1 or 5)
Physical node identifier of the source of the packet (type = 3 or 7)

type

1 - register read of the base registers
3 - register contents (base registers)
5 - register read of the paged registers
7 - register contents (paged registers)

page

0 - Port Status Page
1 - Product Identification Page
2-7 - (these pages not implemented, always responds with zero)

port

Identify the port for the selected register page. For values 0, 1 and 2, the page is as
defined in Table 2.17. For all other values the SBPH400 always responds with zero.

reg

If type = 1, then reg directly addresses one of the base registers.
If type = 5, then reg addresses 1000

+reg in the selected page and port.

data

Current value of the SBPH400 register addressed by the immediately preceding Remote
Access packet (reserved and unimplemented fields and registers are returned as zero).

0 0

phy_ID

logical inverse of first quadlet

port

reg

reserved

page

type

0 0

phy_ID

logical inverse of first quadlet

port

reg

data

page

type

0 0

phy_ID

logical inverse of first quadlet

port

0000

cmnd

000

type(8)

0000

SBPH400-3

15/43

Figure 2.9

Remote confirmation packet format

The fields in the remote command and remote confirmation packets are interpreted as shown
in Table 2.4.

2.8

Link interface

2.8.1 Overview

The link interface in the SBPH400 operates as described in the IEEE P1394a proposal.

The SBPH400 implements an interface to a single 1394 link layer device, using the pins D[0:7],
Ctl[0:1], LREQ, SClk, LPS and LKON. The interface is scalable, using 2 data bits in parallel
per 100 Mbit/sec. This enables the clock rate of the signals at this interface to remain at 50
MHz.

Table 2.4

Remote Command and Confirmation packet fields

Field

Comment

phy_ID

Physical node identifier of the destination of the packet (type = 8)
Physical node identifier of the source of the packet (type = A

)

type

8 - remote command packet
A

- remote confirmation packet

port

Identify the port for the command or confirmation. For values other than 0, 1 and 2, the
SBPH400 always responds with the OK bit set to zero in the confirmation packet.

current value of the Fault bit from SBPH400 register 1001

for the addressed port

current value of the Connected bit from SBPH400 register 1000

for the addressed port

current value of the Bias bit from SBPH400 register 1000

for the addressed port

current value of the Disabled bit from SBPH400 register 1000

for the addressed port

1 if the immediately preceding remote command was accepted by the SBPH400, zero
otherwise

cmnd

type = 8:-
0 - NOP
1 - Transmit TX_DISABLE_NOTIFY then disable the port
2 - Initiate suspend
4 - Clear the port's Fault bit
5 - Enable port
6 - Resume port
type = A

The cmnd value from the immediately preceding remote command packet

data

Current value of the SBPH400 register addressed by the immediately preceding Remote
Access packet (reserved and unimplemented fields and registers are returned as zero).

0 0

phy_ID

logical inverse of first quadlet

port

000

cmnd

000

type(A

)

c b d ok

16/43

SBPH400-3

The SBPH400 has control over the bidirectional pins. It will, upon request, transfer this control
to the link device, which can then drive these pins. The 8 bidirectional data pins D[0:7] form
the data bus. The portion of the D bus which carries packet data is left-justified starting with
the 0 bit. Packet data for 100 Mb/s transfers uses D[0:1], 200 Mb/s transfers use D[0:3], and
400 Mb/s transfers use D[0:7]. The unused D[n] signals are transmitted as `0' and are ignored
when the link device has control of the bus. The control bus CTL[0:1] carries the control
information. The LREQ pin is used by the link device to request access to the serial bus and
to read and write the chip registers.

2.8.2 Types of operation

The four basic operations which may occur at the PHY-Link interface are: request, status,
transmit and receive. Request is the only operation initiated by the link layer device. The link
layer device uses the request operation to read or write a register located in the SBPH400 or
to request the bus so that the SBPH400 can initiate a transmit action on the bus. The
SBPH400 initiates a receive action whenever a packet is received from the serial bus and a
status indication to notify events to the link layer device.

2.8.3 Control pins

When the SBPH400 has control of the PHY-Link interface the CTL[0:1] lines are encoded as
shown in Table 2.5.

When the link layer device has been granted the PHY-Link interface by the SBPH400, it should
encode the CTL[0:1] lines Table 2.6

Table 2.5

CTL[0:1] When the SBPH400 is driving

CTL[0:1]

NAME

DESCRIPTION

Idle

No activity (default mode)

Status

The SBPH400 is sending status information to the link device

Receive

An incoming packet is being transferred from the SBPH400 to the link
device

Grant

The link device is granted the bus to send a packet

Table 2.6

CTL[0:1] when the link is driving (upon grant from SBPH400)

NAME

DESCRIPTION

Idle

The link device has released the bus (normally after transmission).
Note that multiple Idles may need to be transmitted.

Hold

The link device is preparing data or wishes to reacquire the bus without
arbitrating to send another packet

Transmit

The link device is sending a packet to the SBPH400

unused

SBPH400-3

17/43

2.8.4 Link device request (LREQ)

The link layer device requests the bus or accesses a register in the SBPH400 by sending a
short serial stream on the LREQ pin. The information sent includes the type of bus request,
the speed at which the packet is to be sent, or a read or write command. The length of the
request stream depends on whether it is a bus request (8 bits), a read register request (9 bits),
a write register request (17 bits), or an accelerate control request (6 bits).

The request stream always commences with a start bit (value 1b) and terminates with a stop
bit (0b). Bit 0 is transmitted first on the serial request stream.

The LREQ timing and the definition of the bits in the transfer are shown in Figure 2.10

Figure 2.10

LREQ timing

The Bus Request is 8 bits long and is specified in Table 2.7. (Note that this is backwards
compatible with the 7-bit format as specified in IEEE 1394-1995, which is also supported by
the SBPH400.)

The Read Request is used to read a register in the device. It is 9 bits long and is specified in
Table 2.8.

Table 2.7

Bus request format

Bit(s)

Name

Description

Start_Bit

Indicates start of transfer. Always 1.

1-3

Request_Type

Indicates the type of bus request being performed. See Table 2.12 for the
encoding of this field.

4-6

Request_Speed

Indicates the speed at which the SBPH400 will be sending the packet for
this request. This field has the same encoding as the speed code from the
first symbol of the receive packet. See Table 2.11 for the encoding of this
field.

Stop_Bit

Indicates end of transfer. Always 0.

Table 2.8

Read register request format

Bit(s)

Name

Description

Start_Bit

Indicates the start of transfer. Always 1.

1-3

Request_Type

100b (Register read)

4-7

Address

Indicates the address of the physical register to be read.

Stop_Bit

Indicates end of transfer. Always 0.

LR0

LR1

LR2

LR3

LR(n-2)

LR(n-1)

18/43

SBPH400-3

The Write Request is used to write to a register in the device. It is 17 bits long and is specified
in Table 2.9.

The Accelerate Control Request is used to control the use of arbitration acceleration in order

to prevent Cycle Start packet starvation. It is 6 bits long and is specified in Table 2.10

The Request Speed field in the bus request is encoded as specified in Table 2.11:

Table 2.9

Write register request format

Bit(s)

Name

Description

Start_Bit

Indicates the start of transfer. Always 1.

1-3

Request_Type

101b (Register write)

4-7

Address

Indicates the address of the physical register to be written.

8-15

Data

Indicates the data to be written to the specified physical register.

Stop_Bit

Indicates end of transfer. Always 0.

Table 2.10

Accelerate control request format

Bit(s)

Name

Description

Start_Bit

Indicates the start of transfer. Always 1.

1-3

Request_Type

110b (AccCtrl)

Acceleration_Select

0 = Decelerate
1 = Accelerate

Stop_Bit

Indicates end of transfer. Always 0.

Table 2.11

Request speed field

LR[4:6]

Data Rate

000

S100

001

not supported (S1600)

010

S200

011

not supported (S3200)

100

S400

101

reserved

110

not supported (S800)

111

reserved

SBPH400-3

19/43

The Request Type field is encoded as specified in Table 2.10:

Table 2.12

Request type field

LR[1:3]

Name

Description

000

ImmReq

Used for Acknowledge Transfers. The SBPH400 takes control of the bus
immediately upon detecting idle without arbitration.

001

IsoReq

Used for Isochronous Transfers. The SBPH400 arbitrates after an
isochronous gap, or transmits immediately if an isochronous packet has
just been received from a child port (fly-by arbitration). The SBPH also
performs accelerated arbitrations (see AccCtrl below) after receiving this
request if the enab_accel register is set to 1.

010

PriReq

Used for Cycle Master requests. The SBPH400 arbitrates after a
subaction gap or, if acceleration enhancements are enabled (enab_accel
register is set to 1) and if accelerate control has been set to allow
accelerations (see AccCtrl below), arbitrates after an ACK packet has
been received, or transmits immediately if an ACK packet has just been
received on a child port (see Accelerate/Decelerate below), ignoring the
fair protocol. This is also used for the second and subsequent optimized
fair transfers

011

FairReq

Used for Fair Transfers. Used for Fair Transfers. The SBPH400 normally
arbitrates after subaction gap. If acceleration enhancements are enabled
(enab_accel register is set to 1) and if accelerate control has been set to
allow accelerations (see AccCtrl below), then the SBPH400 will arbitrate
after an ACK packet has been received, or transmit the packet
immediately if an ACK packet has been received on a child port. In all
cases the SBPH400 follows the fair protocol (one FairReq packet per
arbitration reset gap).

100

RdReg

Return specified register contents through a status transfer.
Note that the result is undefined if a previous RdReg request has not been
completed.

101

WrReg

Write to specified register.

110

AccCtrl

Accelerate control. The link should send an AccCtrl request with
Acceleration_Select = 0 (Decelerate) if it is not root and when its cycle
timer has counted a 125

s interval. The SBPH400 will not employ ACK

accelerated arbitration or fly-by arbitration for asynchronous packets until
a subsequent Accelerate request with Acceleration_Select = 1
(Accelerate) is received or an IsoReq has been received. The link should
send an Accelerate request with Acceleration_Select = 1 after it has
received a cycle start packet if it has no isochronous packets to transmit
in the current isochronous cycle.

111

reserved

ignored

20/43

SBPH400-3

2.8.5 Bus request

The SBPH400 obeys the rules specified in the P1394a proposal for the disposition of requests
received from a link device, provided that the link device follows the P1394a rules for when it
may issue requests.

The link device sends the request for the bus for fair (FairReq) or priority (PriReq) access at
least one clock after the interface becomes idle or during a status transfer from the SBPH400.
A cycle master node uses a priority request (PriReq) to send the cycle start packet.

A receive state (CTL[0:1]=10) at any time during or after the link device sends a fair or priority
request transfer indicates to the link device that the request cannot yet been granted, due to
the arrival of an incoming packet. If arbitration acceleration is enabled, and the incoming
packet is null or has no more than 8 bits, then the SBPH400 retains the request, otherwise the
request is discarded as soon as the SBPH400 determines that the incoming packet has more
than 8 bits. The request always discarded if arbitration acceleration is not enabled. The link
device should reissue a discarded request on the next idle or status.

A link device uses the IsoReq request at any time to request the SBPH400 to send an
isochronous packet. The SBPH400 will wait for a an isochronous gap before arbitrating for the
bus. The SBPH400 will clear the request only when the bus has been won, or if it performs a
status transfer indicating a subaction gap (this indicates an error condition and should not
occur).

A link device must issue a ImmReq request to send an acknowledge packet during the
reception of a packet addressed to it or no later than the fourth SClk cycle after the interface
went idle. As soon as the packet reception ends the SBPH400 immediately takes control of
the bus and grants the bus to the link device. If the header CRC of the packet happens to be
bad the link device should release the bus immediately. Note that the link device should not
use this request to send another type of packet. This can be ensured by making the link device
wait for 160 ns after the end of the receive packet to allow the SBPH400 to grant it the bus for
the acknowledge. The bus is then released before starting another request.

After the link issues a request for the access to the bus (immediate, iso, fair, or priority) it
cannot issue another bus request until the SBPH400 indicates that the request is either "lost"
(incoming packet, other than an ACK packet when accelerations are enabled) or "won" (grant).
When a previous bus request is pending the SBPH400 ignores new bus requests.

All outstanding requests are cancelled on a bus reset.

2.8.6 Register Read/Write requests

For write requests, the SBPH400 takes the data field of the LREQ transfer and loads it into the
addressed register as soon as the transfer is complete.

For read requests, the SBPH400 returns the contents of the addressed register at the next
opportunity through a 16-bit status transfer. The link device may perform a read or write
register operation at any time.

SBPH400-3

21/43

2.8.7 Status transfer

A 4-bit status transfer of S[0:3] is initiated by the SBPH400 when any of the four status bits
S[0] to S[3] (as specified in Table 2.13) is set to 1. A 16-bit status transfer of s[0] to s[15] (as
specified in Table 2.13 is initiated by the link in response to a register read request from the
link device, or to indicate the node's new phy_ID after a bus reset during the Self_ID process.
After the link interface is idle, a status transfer is initiated with the assertion of status (CTL[0:1]
= 10) condition by the SBPH400. The first two bits of status information (S[0:1]) are made
available on D[0:1]. The status condition is held on CTL[0:1] for the duration of transfer. The
SBPH400 ensures that there is at least one clock cycle between status transfers.

Figure 2.11

Status transfer timing

Table 2.13

Status bits

Bit (S[n])

Name

Description

ArbitrationResetGap

This bit indicates that the SBPH400 has detected that the
serial bus has been idle for an arbitration reset gap time (this
is defined in the IEEE 1394 standard). This bit is used by the
link device in the busy/retry state machine. This bit is reset
after the status transfer or when a transfer occurs on the bus.

SubactionGap

This bit indicates that the SBPH400 has detected that the
serial bus has been idle for a subaction gap time (this is
defined in the IEEE 1394 standard). This bit is used by the link
device to detect the end of an isochronous cycle. This bit is
reset after a status transfer or when a transfer occurs on the
bus.

BusReset

This bit indicates that the SBPH400 has entered the bus reset
state. This bit is reset after a status transfer

PHY_Interrupt

This bit is set whenever any of the interrupt-generating status
bits (Loop detect, Power fail, State time-out, Port event) is set
to 1. This bit is reset after a status transfer.

4-7

Address

These bits indicate the address of the SBPH400 register
whose contents are being transferred to the link device

8-15

Data

These bits provide the current value of SBPH400's register.

S[0,1]

S[2,3]

S[14,15]

SBPH400
CTL[0:1]

SBPH400

D[0:1]

22/43

SBPH400-3

In the event of a packet reception during status transfer, the SBPH400 prematurely ends the
transfer by removing the status indication on the CTL[0:1]. Note that any status bits transferred
will be reset, even if the status transfer is prematurely terminated (i.e. if it is terminated after
the transfer of S[0:1], then S[0:1] will be reset. If it is terminated after the transfer of S[0:n]
where n>=3, then S[0:3] will be reset. The status transfer will be retried at the next available
opportunity if it was a 16 bit status transfer, or if it was a 4 bit status transfer and at least one
of the four status bits S[0] to S[3] is (still) 1.

2.8.8 Transmit

The link device requests access to the serial bus through LREQ when it wants to transmit
information. The SBPH400 arbitrates, using the timing algorithm appropriate to the request
type, to gain access to the serial bus. After the SBPH400 wins the arbitration, it grants the bus
to the link device by asserting grant on the CTL pins for one clock cycle, followed by idle for
one clock cycle. When it receives control of the bus, the link may assert one cycle of idle on
the CTL pins (this may be advisable when using PHY-Link isolation). While preparing data, the
link device keeps the ownership of the bus by asserting hold on the CTL pins. It is not
necessary for the link device to assert hold if it is ready to transmit as soon as bus is granted.
When it is ready to transmit a packet, the link device asserts transmit on the CTL pins along
with the first bits of the packet.

After sending the last bits of the packet when the link device does not wish to concatenate
another packet, the link device asserts idle on the CTL pins for two clock cycles before
tristating the CTL pins. After sending the last bits of the packet when the link device wishes to
concatenate another packet, the link device asserts hold on the CTL pins for one cycle,
together with the speed code for the next packet, followed by a single cycle of idle before
tristating the CTL pins. The link device may release the bus after the SBPH400 has asserted
grant by asserting idle on the CTL pins for three cycles, and may release the bus after
asserting hold by asserting idle on the CTL pins for two cycles.

The hold state indicates to the SBPH400 that the link device wants to send another packet
without releasing the bus (a concatenated packet). The SBPH400 responds to the hold by
waiting the required minimum time and then asserts transmit as before. The speed of the
concatenated packet is indicated at the time that the hold state is asserted, using the encoding
specified in Table 2.14.

Note that it is not permitted to transmit a S100 packet as a concatenated packet after
transmitting a higher speed packet. Note that, for compatibility with 1394-1995 PHYs, P1394a
requires that if "multi-speed concatenated packets" is not enabled (see Table 2.16), the speed
code for any concatenated packet which is received from the link will be ignored, and the
packet will be transmitted at the same speed as the packet to which it is concatenated. The
SBPH400 will supply the appropriate speed code as it transmits the packet on the bus.

When the link device has finished sending the last packet of the current bus ownership, it
releases the bus by asserting idle on the CTL pins for two consecutive clock cycles. The
transmit timing is shown in Figure 2.12.

24/43

SBPH400-3

2.8.9 Receive

When the SBPH400 detects the "data-on" state on the serial bus, it starts the receive operation
by asserting receive on the CTL pins and `1' on each of the D pins. The SBPH400 indicates
the beginning of the packet by placing on the D pins the speed code, as defined in Table 2.14.
The speed code is followed by the contents of the received packet using the appropriate range
of D pins (D[0:1] for S100, D[0:3] for S200 and D[0:7] for S400). The CTL pins will remain in
the receive state until the last symbol of the packet has been transferred to the link device. The
end of the packet is indicated by the CTL pins going back to the idle state. Note that the speed
code is part of the link interface protocol and is not included in the calculation of CRC. Note
that P1394a requires that, for compatibility with 1394-1995 PHYs, if "multi-speed
concatenated packets" is not enabled (see Table 2.16), any concatenated packet which is
received without a speed code is assumed to be transmitted at the same speed as the packet
to which it is concatenated. If the SBPH400 detects such a packet then it will indeed make this
assumption, and will supply the appropriate speed code in front of the packet as it transfers it
to the link device. The receive timing is shown in Figure 2.14.

Figure 2.13

Receive timing

Table 2.14

Speed codes on the LINK-PHY interface

D[0:7]

Data Rate

00000000

S100

01000000

S200

01010000

S400

11111111

"data-on" indication

CTL[0:1]

D[0:7] (hex)

SBPH400-3

25/43

2.8.10 SBPH400 registers

The accessible SBPH400 registers are listed in Table 2.15. The descriptions of the fields are
given in Table 2.16.

Table 2.15

Accessible SBPH400 register

Address

0000

Physical_ID

0001

RHB

IBR

Gap_count

0010

111b (Extended)

rsv

0011b (Total ports)

0011

Max speed

rsv

0000b (Delay)

0100

Link_active

000b (Jitter)

Power_class

0101

Resume_

int

ISBR

Loop

Pwr-fail

State

t_out

Port

event

Enab_

accel

Enab_

multi

0110

rsv

0111

Page_select

rsv

Port_select

1000-1111

Table 2.16

SBPH400 register fields

Field

Size

Type

Description

Physical_ID

The address of the node determined during self-identification.

When set to 1, indicates that the node is the root.

Cable power status. This value always reflects the filtered voltage
sensed on the CPS pin.

RHB

R/W

Root Hold-off bit. When set to 1, instructs the node to attempt to
become the root during the next Tree-ID process. Value on power
reset is 0.

IBR

R/W

Initiate Bus Reset bit. When set to 1, instructs the SBPH400 to initiate
a bus reset for 166

sec immediately. Always reads as zero.

Gap_Count

R/W

Arbitration timer setting. Used to optimize gap times based on the
topology of the network.

Extended

Always reads as 111b to indicate use of the extended PHY register
map

Total_Ports

Always reads as 3

Max_Speed

010b (maximum speed is S400)

Delay

0000b (maximum repeater delay is 144 ns)

Link_active

R/W

Set or cleared by software. Note that the value of the L bit transmitted
in the self-ID packet is the AND of the Link_active bit and the LPS pin.
Initialized to the value of the LACT configuration pin on power reset.

R/W

Contender. Set or cleared by software to control the value of the C bit
transmitted in the self-ID packet. On power reset this is initialized to
the value of the CMC pin.

Jitter

000b (fastest and slowest repeater delay differ by 20ns)

26/43

SBPH400-3

Power_class

R/W

Power class. Set by software to control the value of the pwr field
transmitted in the self-ID packet. On power reset, this is initialized to
the values of the PC[0:2] pins.

Resume_int

R/W

Resume interrupt enable. When set to 1, the SBPH400 sets
Port_event to 1 if resume operations commence for any port.
Initialized to 0 on power reset.

ISBR

R/W

Initiate short (arbitrated) bus reset. Unless entry to suspend or resume
is in progress for any of the SBPH400's ports, a write of one to this bit
requests the SBPH400 to arbitrate after a sub-action gap and issue a
short bus reset. Any outstanding fair request is abandoned. Unlike fair
bus requests, the request persists until won, or until a time-out forces
a long bus reset. Always reads as 0.

Loop

R/W

Loop detect interrupt. Set to one when the Tree-ID process detected
a loop. The PHY_interrupt status bit is set when this bit transitions
from 0 to 1. A register write with the value 1 in the field corresponding
to this bit clears the register to zero. A register write with a value 0 to
the field corresponding to this bit is ignored.

Pwr_fail

R/W

Cable power fail interrupt. Set when the PS register changes from 1 to
0. The PHY_interrupt status bit is set when this bit transitions from 0
to 1. A register write with the value 1 in the field corresponding to this
bit clears the register to zero. A register write with a value 0 to the field
corresponding to this bit is ignored.

State t_out

R/W

State time-out interrupt. Set to 1 when the arbitration state machine
has been in any state other than Idle, Tree-ID state T0, Transmit or
Receive for longer than 300

sec. The PHY_interrupt status bit is set

when this bit transitions from 0 to 1. A register write with the value 1 in
the field corresponding to this bit clears the register to zero. A register
write with a value 0 to the field corresponding to this bit is ignored.

Port_event

R/W

Port event detect. Set to 1 when any of Connected, Bias, Disabled or
Fault change for a port whose Int_enable bit is one, or when resume
operations commence for any port and Resume_int is set to 1. The
PHY_interrupt status bit is set when this bit transitions from 0 to 1. A
register write with the value 1 in the field corresponding to this bit
clears the register to zero. A register write with a value 0 to the field
corresponding to this bit is ignored.

Enab_accel

R/W

Enable ACK accelerated and fly-by arbitration. Initialized to 0 on
power reset.

Enab_multi

R/W

Enable multi-speed packet concatenation. Initialized to 0 on power-on
reset.

Table 2.16

SBPH400 register fields (continued)

Field

Size

Type

Description

SBPH400-3

27/43

Page_select

R/W

Select extended register page for a subsequent PHY register read or
write operation.

0 = Port Status Page
1 = Product Identification Page

Initialized to 0 on power reset.

Port_select

R/W

Identify the port for the selected register page for a subsequent PHY
register read or write operation. For values 0, 1 and 2, the page is as
defined in Table 2.17. For all other values, a subsequent write to any
register in the page has no effect, and a subsequent read from any
register in the page returns zero. Initialized to 0 on power reset.

rsv

R/W

Field reserved in P1394a for future use. No effect on write, always
reads as zero.

Table 2.17

Port status page

Address

1000

AStat

BStat

Child

Con

Bias

Dis

1001

Negotiated_speed

Int_

enable

Fault

rsv

1010-1111

rsv

Table 2.18

Port status register fields

Field

Size

Type

Description

AStat

TPA line state on the selected port
(11

= Z, 01

= 1,10

= 0, 00

= invalid).

BStat

TPB line state on the selected port
(11

= Z, 01

= 1,10

= 0, 00

= invalid).

Child

If 1 the corresponding port is a child, else parent (only
valid after Self_ID)

Con

If 1 the corresponding port is connected, 0 if the port is
disconnected.

Bias

Reflects the Bias detected status on the port (1 = Bias
detected) after filtering

Dis

R/W

The port is disabled when this bit is set to 1, and
enabled when this bit is set to 0. Initialized to the value
of the PDISABLE pin on power reset.

Negotiated_speed

The negotiated speed for this port (only valid after
Self_ID). Possible values are 000b (S100), 001b
(S200), 010b (S400)

Table 2.16

SBPH400 register fields (continued)

Field

Size

Type

Description

28/43

SBPH400-3

The 6-bit Division field identifies the product group within SGS-THOMSON.

The 10 bit Product field identifies the product within the Division.

The Major revision will increment with each major revision of the device. The minor revision
will start at 0 for each major revision and will increment with mask fixes, etc.

Note:

The Division and Product fields are identical to the corresponding fields when accessing the
SBPH400 via the JTAG Test Access Port.

2.9

Reset and initialization

2.9.1 Power on

Figure 2.14

SBPH400 reset timing

Table 2.19

Product identification page

Address

1000

1 (Compliance level = P1394a)

1001

rsv

1010

Manufacturer's OUI (MSB - 00

)

1011

Manufacturer's OUI (80

)

1100

Manufacturer's OUI (LSB - E1

)

1101

Division (08

)

Prod-MSB (0)

1110

Product- LSB (01

)

1111

Major revision (1)

Minor revision (see note)

E x t os c illa to r

( w h e re u se d )

R e se t#

S B P H 4 0 0 o p e ra tio n a l

50 0

s ec

1 0 0 n s m in

D D

p re se n t)

SBPH400-3

29/43

On Power on, the Reset# pin should be held low for 2ms to allow supplies to settle. To reset
the device when V

is already present, the Reset# pin should be held low until a minimum of

100ns after the external oscillator (if used) is started and operating within specification. The
SBPH400 will wait for approximately 500

sec to allow its internal clocking circuitry to stabilize.

At the end of the nominal 500

sec period, the SBPH400 becomes fully operational. Prior to

the SBPH400 becoming fully operational, all outputs on the PHY/Link interface are held in high
impedance, as are the TpBias and TPA and TPB pins for all three ports. When the SBPH400
becomes fully operational, it senses the ISO, PC[0:2], CMC, LACT and PDISABLE. If ISO = 0,
then all outputs on the PHY/Link interface are taken to zero, and the SBPH400 will also then
respond to LPS if this pin is active (see 2.9.2).

2.9.2 PHY/Link Interface start-up

The PHY/Link interface is controlled by the link device via the LPS signal. In order to indicate
to the SBPH400 that the link interface is active, LPS should either be held to a logic 1 (possibly
by connecting to the V

D D

supplying the link layer device) or be connected to a pulsed output

which meets the specification shown in Figure 2.15 and Table 2.20. If neither of these is true
after power reset (see above), then no signal is considered to be received on LPS, the link
interface continues to be disabled, and the SBPH400 operates as a PHY repeater.

Figure 2.15

LPS timing (isolated interface)

When LPS is asserted, the PHY/Link interface starts as illustrated in Figure 2.16

Table 2.20

LPS timings

Symbol

Parameter

Unit

Min

Typ

Max

LPSL

LPS low time (isolated interface)

1000

LPSH

LPS high time (Isolated interface)

1000

LPSH

LPSL

LPS

(isolated)

30/43

SBPH400-3

Figure 2.16

PHY/Link interface start-up timing

When LPS is reasserted, the SBPH400 resumes sending SCLK (if necessary) after 40-60 ns
if the SBPH400 is operational, or otherwise after a nominal period of 500

sec if LPS is used

to bring the SBPH400 out of suspend. If the interface is operating in direct mode (ISO = 0) then
Ctl[0:1] and D[0:7] are held zero. If the interface is operating in isolated mode (ISO = 1), then
the SBPH400 maintains high impedance for the first cycle of SCLK, asserts zeros on Ctl[0:1]
and D[0:7] for the second cycle of the resumed SCLK, and maintains high impedance for
cycles 3 to 7. The SBPH400 asserts a nominal receive indication on Ctl[0:1] for the eigth cycle,
while simultaneously indicating data_prefix on D[0:7] (all 1's). This is maintained for further
cycles if the SBPH400 is in a state where it would otherwise be transferring data.

2.9.3 PHY/Link interface reset and disable

The PHY-Link interface may be reset by taking LPS low for a minimum of 2.75

sec, but less

than 25

sec. During this time the Ctl[0:1] and D[0:7] signals are disabled, but the SBPH400

continues to provide SCLK.

If neither of these is true for a period greater than 25

sec, then no signal is considered to be

received on LPS, the link interface is disabled, and the SBPH400 operates as a PHY repeater.
When the link interface is disabled, all outputs are held to zero if the interface is operating in
direct mode (ISO = 0), otherwise (ISO = 1) all outputs are maintained in high impedance. The

LP S

S C lk (d ir e ct)

S C lk (is o)

C [0 :1 ], D[0:7 ]

(iso )

(dire ct)

5 n s (m in)

40 - 6 0 n s (S BP H 400 op era tio na l)
50 0

s n om ina l (S B P H 40 0 susp e nde d)

SBPH400-3

31/43

timing parameters are given in Table 2.21, and the signal relationships are illustrated in Figure

2.17 and Figure 2.18.

Figure 2.17

PHY-Link reset timing

Figure 2.18

PHY-Link disable timing

Table 2.21

PHY/Link interface reset and disable timing parameters

Symbol

Parameter

Unit

Min

Typ

Max

LPS_RESET

Time for SBPH400 to recognize LPS logically
deasserted and reset the interface

1.2

2.75

LPS_DIS

Time for SBPH400 to recognize LPS logically
deasserted and disable the interface

RESTORE

Time to permit the optional differentiator and
isolation circuits to restore during an interface
reset

SCLK

LPS

LPS
(isolated)

CTL

DATA

LREQ

LPS_RESET

RESTORE

SCLK

LPS

LPS
(isolated)

CTL

DATA

LREQ

LPS_DISABLE

RESTORE

32/43

SBPH400-3

2.9.4 LKON (link on)

The LKON pin is used as an output to indicate that the SBPH400 has received a Link_On
packet. If the there is no signal on the LPS pin (indicating that the link device is not currently
powered) or the Link_active register is zero (link interface turned off by software) and a
Link_On packet is received addressed to the node, then a 6.144 MHz signal is output on the
LKON pin. This signal is turned off within 500 ns when both there is a signal received on LPS
and the Link_active register is 1.

2.10 ISO (isolation)

The SBPH400 supports the use of an isolation barrier between the chip and a link device. If
ISO is set high, then the an internal pulsed differentiating function is used on the CTL[0:1] and
the D[0:7] pins when used as outputs. Appropriate threshold circuitry is included on these pins
when used as inputs to interpret differentiated signals correctly. The differentiation circuitry
transmits a 1 or a 0 when there is a logical transition to 1 or 0 respectively, otherwise the output
is set to high impedance. This is shown in Table 2.22. This allows an arbitrary sequence of 1's
or 0's to be transmitted across an AC coupled isolation interface.

2.11 CPS (cable power status)

This input should be connected to the power supply provided from the cable via an external
series 400 KOhm resistor. The internal logic associated with this pin provides a nominal filtered
cable power fail voltage (as applied to the external resistor) threshold of 6.25 volts. The internal
logic will report 1 in the PS register when the external voltage on the resistor exceeds the
threshold, and will report 0 in the PS register when the external voltage falls below the
threshold. A transition from 1 to 0 on the value in the PS register causes the Pwr_fail register
to be set to 1, which in turn will cause a link status transfer with the PHY_Interrupt bit set if the
Link interface is active, otherwise will cause a LinkOn signal. Appropriate protection is
incorporated in the SBPH400 for cable power voltages within the 1394 specification applied
via the external series resistor.

Table 2.22

Output differentiation for isolation

Next

Previous

SBPH400-3

33/43

Pin Description

Table 3.1

Pin description - normal operation

Pin name

Pin number

I/O

Description

AGND

15, 23, 25, 80

Analog Ground

AVDD

6, 24, 26, 79

Analog Supply Voltage

CLK24

External 24.576 MHz oscillator input (optional, see QX0)

CMC

Configuration Manager Contender. Used to initialize the C register
at power-on reset. It should be programmed by connecting it to
V

(C=1) or GND (C=0).

CPS

Cable power status.

CTL[0:1]

46, 45

I/O

Control signals for PHY-Link interface

D[0:7]

59 - 51

I/O

Data signals for PHY-Link interface

DGND

12, 13, 14, 27,
28, 29, 30, 31,
34, 40, 43, 48,
49, 50, 61, 69,

70, 72, 73, 74

Digital Ground

DVDD

32, 33, 47, 71

Digital Supply Voltage

ISO

Link interface isolation logic control. Logic level 1 on this pin
enables the isolation logic, 0 disables the isolation logic (normally
tied to V

or GND as required)

LACT

Link Active. Used to initialize the Link Active register on power
reset. It should be programmed by connecting it to V

(Link Active

= 1) or GND (Link Active = 0).

LKON

Link on o/p

LPS

Link power status.

LREQ

Link request to SBPH400

N/C

35, 75, 76

Inputs not used in normal operation, may be connected to V

GND, or left unconnected.

OGND

Oscillator ground

OVDD

Oscillator supply voltage

PC[0:2]

65 - 67

Power Class input

PDISABLE

Ports disable. Used to initialize all three ports as disabled on
power-on reset.

QX0

24.508 MHz crystal input 0 (optional, see CLK24)

QX1

24.508 MHz crystal input 1 (optional, left unconnected if not used,
must not be taken to power or GND)

R[0:1]

22, 21

External resistor for bias current setting

RESET#

Reset. Taking this signal low causes all activity to cease. When this
signal is taken high, all appropriate registers and outputs are
initialized to their power reset values and a 166

sec bus reset is

initiated.

34/43

SBPH400-3

Some pins on the SBPH400 have different functionality in various test modes. Table 3.2
identifies these pins for ease of reference, but the full description of the associate functions is
not included in this data sheet.

SCLK

Clock to Link device - 49.152 MHz

TPA1

I/O

Positive signal of cable pair A of port 1

TPA1#

I/O

Negative signal of cable pair A of port 1

TPB1

I/O

Positive signal of cable pair B of port 1

TPB1#

I/O

Negative signal of cable pair B of port 1

TPA2

I/O

Positive signal of cable pair A of port 2

TPA2#

I/O

Negative signal of cable pair A of port 2

TPB2

I/O

Positive signal of cable pair B of port 2

TPB2#

I/O

Negative signal of cable pair B of port 2

TPA3

I/O

Positive signal of cable pair A of port 3

TPA3#

I/O

Negative signal of cable pair A of port 3

TPB3

I/O

Positive signal of cable pair B of port 3

TPB3#

I/O

Negative signal of cable pair B of port 3

TPBIAS1

Cable Termination voltage source for port 1

TPBIAS2

Cable Termination voltage source for port 2

TPBIAS3

Cable Termination voltage source for port 3

Table 3.2

Pin description - test pins

Pin name

Pin number

I/O

Description

CLK98

98.304 MHz Oscillator input, used when PLLDIS is tied to V

PLLDIS

Internal PLL disable pin. Tie to V

to disable internal PLL.

SCI[0:2]

76, 67, 65

Used to serially shift data into the SBPH400 for production test

SCO[0:2]

68, 66, 64

Used to serially shift data out of the SBPH400 for production test

TCK

Test clock. Used to clock data into and out of the SBPH400 during
operation of the Test Access Port or production test.

TDI

Test Data Input. Used to serially shift test data and test instructions
into the SBPH400 during TAP operations.

TDO

Test Data Output. Used to serially shift test data and test
instructions out of the SBPH400 during TAP operations.

TEST
ENABLE

Reserved for production test

TESTMODE

Reserved for production test

TMS

Test Mode Select. This signal controls the state of the TAP
controller within the SBPH400.

TRST#

Test Reset. Resets the TAP controller.

Table 3.1

Pin description - normal operation (continued)

Pin name

Pin number

I/O

Description

SBPH400-3

35/43

Electrical Specifications

4.1

Absolute maximum ratings

Note:

Stresses greater those listed under "Absolute Maximum Ratings" may cause permanent dam-
age to the device. This is a stress rating only and functional operation of the device at these
or any other conditions above those indicated in the operational sections of this specification
is not guaranteed. Exposure to absolute maximum rating conditions for extended periods may
affect device reliability. During overload conditions (

) the voltage on pins

with respect to ground (

) must not exceed the values defined by the Absolute Maximum

Ratings.

4.2

Operating conditions

Table 4.1

Absolute maximunm ratings

Symbol

Parameter

Units

Min

Max

Supply Voltage

INL

Logic signal input low level

-0.5

INH

Serial signal input level

TTL input signals

+0.5

5.5

MAX

Maximum assembly temperature (for 10
seconds maximum)
Storage temperature

-65

260

150

Table 4.2

Operating conditions

Symbol

Parameter

Units

Min

Typ

Max

Supply Voltage

3.0

3.3

3.6

Supply Ripple (DC to 1 GHz)

100

Ambient temperature

Supply current @ 25

C, 3.3 volts

with parallel outputs loaded by 10pF

300

36/43

SBPH400-3

4.3

DC characteristics

The following values apply to the analog signals TPAn, TPAn#

The following values apply to the analog signals TPBn, TPBn#

Table 4.3

DC characteristics for TPAn, TPAn#

Symbol

Parameter

Units

Min

Typ

Max

Differential output peak-to-peak voltage,
terminated by 55

load

172

265

(OFF)

Off-state common mode output voltage

Common mode impedance (driver disabled)

Differential impedance (driver disabled)

ARB1

Serial input differential amplitude for arbitration '1'
detect

168

ARBZ

Serial input differential amplitude for arbitration 'Z'
detect

-89

ARB0

Serial input differential amplitude for arbitration '0'
detect

-168

ISWS

Serial input differential amplitude (absolute value)
during data transmission

118

260

IT200

Speed signal threshold voltage relative to TPBIAS
(TPBIAS-TPA common mode voltage), S200

139

264

IT400

Speed signalling threshold voltage relative to
TPBIAS (TPBIAS-TPA common mode voltage),
S400

445

682

Table 4.4

DC characteristics for TPBn, TPBn#

Symbol

Parameter

Units

Min

Typ

Max

Differential output peak-to-peak voltage, terminated by
55

load

172

265

(OFF)

Off-state common mode output voltage

Common mode impedance (driver disabled)

TH_BIAS_CON

TpBias connect threshold

1.0

TH_BIAS_DIS

TpBias disconnect threshold

0.6

CM100

Common mode output current, speed signalling off or
speed signal = S100

-0.81

0.44

CM200

Common mode output current, speed signal = S200

-2.53

-4.84

CM400

Common mode output current, speed signal = S400

-8.10

-12.4

ARB1

Serial input differential amplitude for arbitration '1'
detect

168

ARBZ

Serial input differential amplitude for arbitration 'Z'
detect

-89

SBPH400-3

37/43

The following values apply to the appropriate device pins in each case

ARB0

Serial input differential amplitude for arbitration '0'
detect

-168

ISWS

Serial input differential amplitude (absolute value)
during data transmission

118

260

Table 4.5

DC characteristics

Symbol

Parameter

Units

Min

Typ

Max

High level output voltage (I

= -4 mA)

2.8

OHD

High level output voltage (I

= -9 mA, CTL[0:1],

D[0:7], SCLK and LKON outputs)

-0.4

Low level output voltage (I

= 4 mA)

0.4

OLD

Low level output voltage (I

= 9 mA, CTL[0:1],

D[0:7], SCLK and LKON outputs)

0.4

High level input voltage

2.6

Low level input voltage

0.7

Input current for CMC, LREQ, LPS, PC[0:2],
RESET#, ISO, PWRDWN, EXTCLK inputs

-10.0

+10.0

Input current for TDI, TMS, TRST# inputs

-125

- 25

Input current for TESTMODE, BISTRUN, TCK
inputs

+25

+125

OFF-state output current, CTL[0:1], D[0:7], LKON,
TDO

-10.0

+10.0

LIT_ISO+

Positive input threshold voltage on LPS input
(V

=3.3V)

1.8

LIT_ISO-

Negative input threshold voltage on LPS input
(V

=3.3V)

1.0

IT_ISO+

Positive input thresholds voltage, CTL[0:1], D[0:7],
LREQ inputs

+0.3

+0.8

IT_ISO-

Negative input thresholds voltage, CTL[0:1],
D[0:7], LREQ inputs

-0.8

-0.3

CPS

Threshold input voltage on CPS input as applied
via an external 400 K Ohm resistor

5.0

6.25

7.5

TPBIAS output voltage

1.665

1.85

2.015

Table 4.4

DC characteristics for TPBn, TPBn# (continued)

Symbol

Parameter

Units

Min

Typ

Max

SBPH400-3

39/43

Table 5.2

AC characteristics (digital interfaces)

Symbol Parameter

Measured

Condition Unit

Min

Typ

Max

psu

D, CTL, LREQ input setup to SCLK
output

50% to 50%

D, CTL, LREQ hold from SCLK output 50% to 50%

lsu

D, CTL output setup to SCLK

50% to 50%

6.5

D, CTL output hold from SCLK

50% to 50%

0.5

Delay time, SCLK input high to initial
instances of D, CTL and LREQ
outputs valid

50% to 50%

Delay time, SCLK input high to
subsequent instances of D, CTL and
LREQ outputs valid

50% to 50%

Delay time, SCLK input high to D, CTL
and LREQ outputs invalid (tri-state)

50% to 50%

Table 5.3

Clock and reset parameters

Symbol Parameter

Measured

Condition Unit

Min

Typ

Max

Fextclk

External clock Frequency

24.576 MHz +/- 2.45 KHz

Dextclk

External clock duty cycle

50% to 50%

45%

55%

Jextclk

External clock Jitter peak to peak

100 pS peak to peak

SCLK

SCLK frequency

50% to 50%

Fextclk

SCLK

SCLK duty cycle

50% to 50%

45%

55%

Power-on reset time, RESET# input

40/43

SBPH400-3

Package Specifications

The S B PH 4 00 -3 is available in a 80 pin plastic thin quad flat pack

Figure 6.1

Normal operation pinout for 80 pin 12mm x 12mmTQFP

25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40

80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65

TPBIAS1

D D

TPA1

TPA1#

TPB1

TPB1#

TPA2

TPA2#

TPB2

TPB2#

TPA3

TPA3#

TPB3

AGN

QX0

/
C

OVD

LACT

CTL0

CTL1

DATA7

DATA6

DATA5

LKON

DGND

SCLK

LREQ

CMC

SET

SBPH400-3

12mm x 12mm

80 lead TQFP

21 22 2324

AGN

AVD

64 63 62 61

I
S

ABL

TPB3#

DGND

DVDD

DGND

TPBIAS2

TPBIAS3

DGND

AGND

DGND

DATA4

DATA3

DATA2

DVDD

DATA1

DATA0

42/43

SBPH400-3

Application Circuit

Note:

Isolation components when using an isolated PHY-Link interface not shown;

1 0

1 1

1 2

1 3

1 4

1 5

1 6

1 7

1 8

2 5

2 9

3 0

3 1

3 7

3 8

8 0 79 7 8 77 7 6 75

7 4 73

7 2 71

70 69

66 65

TPBIAS1

AV DD

TPA1

TPA1#

TPB1

TPB1#

TPA2

TPA2#

TPB2

TPB2#

TPA3

TPB3

AGND

AVDD

QX0/

OVDD

DGND

LA CT

CTL0

CTL1

D ATA 7

D ATA 6

D ATA 5

LK ON

D GN D

SCLK

LREQ

PC
1

DGND

LP
S

N/
C

AVDD

AGND

SBPH400-3

2 3

2 4

DGND

DVDD

AGND

AVDD

64 6 3 62

DGND

PD
IS
A

PC
0

TPB3#

DG ND

PC
2

ISO

DGND

DVDD

DGND

D VD D

D GN D

TPBIAS 2

TPBIAS 3

DG ND

DGND

AGND

DGND

DVDD

D GN D

D ATA 4

D ATA 3

D ATA 2

D VD D

D ATA 1

D ATA 0

DGND

N/
C

DGND

N/
C

QX1

OGND

3 00nF - 1

D D

5 K

250 pF

Ca ble

C able

G ro und

D D

0. 1

D D

10 0K

D D

u ser setting s

D D

3.0K

+/- 1 %

F or TP A 2/A2 *, TP B2 /B 2*, T P B I A S 2,

T P A 3 /A 3* , TP B 3/B 3* a nd T P B I A S 3

c om po nent con ne cti o ns ar e the sam e as

T P A 1/A 1 *, TP B1 /B 1* and TP B IA S 1

I
N

TERF

(
*

)

(* ) Iso lation cir cu it use d if I S O pin enab le

40 0K

E xternal 24 .576 M H z Cr ystal O R E xternal os cill ator o ption

N /C

N C* *

N /C

D D

Ca ble P o w er

(* *) A ll N /C ( no n connec ted ) p ins, B UT N O T N C ** ( p in 3 6) may b e con nec ted to e it her G N D o r V

D D

43/43

Notes

Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no
responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third
parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights
of SGS-THOMS ON Microelectronics. Specifications mentioned in this publication are subject to change without notice.
This publication supercedes and replaces all information previously supplied. SGS-THOMSON Microelectronics products
are not authorized for use as critical components in life support devices or systems without the express written approval
of SGS-THOMSON Microelectronics.

GLINT

is a Trademark of BULL S.A.

This circuit uses patents licenced by BULL S.A.

SGS-THOMSON Microelectronics Group of Companies

Australia - Brazil - Canada - China - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands -

Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A.

Ð­Ð»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: SBPH400-3

ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: SBPH400-3