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Электронный компонент: 77950

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1 of 3
April 3, 2001
2001 Integrated Device Technology, Inc.
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SwitchStar
TM
Reference Design Using the
IDT77V400 Switching Memory and
IDT77V500 Switch Controller
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Complete ATM switch with up to eight ports at 155Mbps
each (1.24Gbps non-blocking aggregate bandwidth)
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Intended for Engineering/Lab use to evaluate and perform
design/software development for the IDT77V400 and
IDT77V500
x
Call setup function and signaling performed by external PC
connected to port 7.
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Software (http://www.idt.com/products/pages/ATM-77950.html)
IDT SwitchBIOS to configure and initialize switch
SARWIN II
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Basic configuration includes three IDT77955 line cards to
equip two transmit/receive ports plus the control/signalling
port
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Supports features of the IDT77V400 and IDT77V500
SwitchStar
TM
products
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IDT77955 Line Cards available for additional switch ports
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Can be used with ATM traffic generators or individual
transmit/receive PCs
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Utilizes IDT77V550 Switch Manager, IDT77010 DPI-to-
UTOPIA Translation Device, and IDT77155 PHY
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The IDT77950 is an ATM Reference Design based on IDT's innova-
tive SwitchStar products, the IDT77V400 Switching Memory and the
IDT77V500 Switch Controller. The Switch is made up of two separate
board components: the 7M950 motherboard, which contains the
Switching Fabric function based on IDT's Switching Memory and Switch
Controller, and an individual IDT77955 OC-3 line card for each individual
transmit receive port.
The 1.2 Gbps ATM switch has eight receive and eight transmit ports.
The Switching Fabric, made up of the IDT77V400 and IDT77V500
SwitchStar products, resides on the motherboard. Each individual port
resides on a line card which is interfaced to the motherboard via a Line
Card PCI connector. Up to eight line cards can be connected to the
motherboard, with each line card running at 155 Mbps.
One of the line cards (Port 7) is used for communicating with a
remote PC to configure, read status and perform Signalling, PNNI and
OAM cell handling for the switch. All the necessary software functions
are performed by the remote PC.
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The motherboard consists primarily of three devices: the IDT77V400
Switching Memory, the IDT77V500 Switch Controller, and the
IDT77950
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SwitchStar and the IDT logo are registered trademarks of Integrated Device Technology, Inc.
ATM Line Card
ATM Line Card
ATM Line Card
ATM Line Card
ATM Line Card
ATM Line Card
ATM Line Card
ATM Line Card
IDT77155 IDT77010
8 inch
8 inch
4309 drw 01
IDT77V400
IDT77V500
IDT77V550
DPI
DPI
ATM Switch Card
0
1
6
7
Signalling/Command
Port
(To PC)
155 Mbps
Transceiver
IDT77955 OC-3 Line Card
IDT77950
2 of 3
April 3, 2001
IDT77950
*Notice: The information in this document is subject to change without notice
IDT77V550. Full duplex 4-bit signals are passed from the motherboard
to the line cards.
The IDT77V400 Switching Memory has eight ports that can either
input and eight output ports and it receives cells via the 4-bit DPI bus.
Incoming cells may be received on any of the up to eight input ports
simultaneously, the stored inside the IDT77V400. Up to 1K ATM cells
per input port (up to 8K ATM cells in a fully configured IDT77950) can be
stored in the IDT77V400, and upon transmission the cells can be sent
out of any of the up to eight output ports. Each one of the receive and
transmit lines has a separate clock, which can be run at SCLK 40 MHz.
The IDT77V500 Switch Controller manages all of the cell traffic that
passes through the IDT77V400, directing the cells and determining
service priority via ATM Quality of Service parameters. The Switching
Memory is polled by the IDT77V500 for the arrival of a new cell. When a
complete new cell is identified on a particular input port, the IDT77V500
reads the cell header, makes switching and priority decisions, and then
commands the IDT77V400 to store the cell until the time to transmit that
particular cell arrives. The IDT77V500 then issues a command to move
the cell to a particular port and transmit. Decisions made by the
IDT77V500 are based on a set of parameters setup in a table via an
external Call Setup Manager CPU.
Additional information on the IDT77V400 Switching Memory and the
IDT77V500 Switch Controller are available in the data sheets for the
respective products.
The IDT77V500 is initialized, configured and updated via an 8-bit
management port. The IDT77V550 Switch Manager is used on the
IDT77950 to interface this 8-bit IDT77V500 management port to the
remote PC via Port 7. This Switch Manager intercepts received cells
from Line Card 7 and copies the cells to the IDT77V500. These cells are
also forwarded to Port 7 of the IDT77V400. The copied cells are identi-
fied using a unique cell header VPI = 00 hex and VCI = 001e hex. This is
a VCI number only used by the IDT77V550. The commands to be
written to the IDT77V500 via the 8-bit manager port are contained in the
payload of these cells.
Similarly, the internal registers of the IDT77V500 are read by the
IDT77V550 and an ATM cell is constructed with VPI = 00 hex and VCI =
0020 hex. This is a unique VCI address used for communication
between the IDT77V500 and the remote PC. Cells generated by the
IDT77V550 are inserted in the DPI cell stream going from the
IDT77V400 to the line card 7. In this way the End Station connected to
the line card 7 controls and monitors the IDT77V500 internal registers.
The IDT77550 uses a 40MHz clock for the IDT77V500 Manager port
and the DPI clock.
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The function of the line card is to interface with the IDT77V400
Switching Memory DPI bus on one side and a 155Mbps fiber cable on
the other. There are three primary components on each line card: on
OC-3 optical line driver, an IDT77155 OC-3 PHY device or equivalent to
the interface the optical line driver to the IDT77010, and a IDT77010
DPI-to-UTOPIA Translation Device line card to interface the UTOPIA 1
PHY to the 4-bit DPI bus of the IDT77V400. The IDT77010 is also used
to in-band signalling to configure, control, and monitor the IDT77155
PHY device.
Power, clock, and the Reset signal are picked up from the mother-
board connector. Three LED's are used on each line card to indicate
cells being transmitted, cells being received, and a carrier detect indi-
cator.
The IDT77010 interfaces the UTOPIA 1 bus to the 4-bit DPI bus and
controls and monitors the PHY registers using an 8-bit multiplexed bus.
A control cell is received and the control command is executed. Similarly
the read control cell status is loaded into a transmit control cell and
transmitted to the remote PC.
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The following items are required to run the IDT77V950 ATM Switch-
Star Reference Design.
1. Standard PC power supply with both 5V and 12V outputs via a
standard 4-pin connector. Plugs into the motherboard and
supplies the power for the motherboard and the line cards.
2. One PC with 7M924 or 7M944 card for Call Setup Manager
activity through Port 7. Must be a Pentium class machine with PCI
Bus and Windows 95.
3. SC-SC Duplex Fiber Optical Cables. One required for each line
card installed in the motherboard.
4. Source for ATM Cell generation and reception, such as an ATM
Analyzer or PC's with the appropriate software.
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Two separate software tools are provided to fully utilize the
IDT77950: IDT SwitchBIOS and SARWIN II NIC driver.
IDT SwitchBIOS is a windows driven program that allows the user to
configure, initialize, and program the IDT77V400 and the IDT77V500. It
offers the opportunity to de software development work on SwitchStar
based switch designs, as well as to analyze switch performance in
various configurations and modes. There is also a script feature which
allows the programmer to set up scripts of repetitive or commonly used
sequences (such as initialization or configuration) that need to be run on
the IDT77950.
The SARWIN II NIC driver must be installed on the PC(s) prior to
running SwitchBIOS. Please refer to the separate IDT SwitchBIOS
documentation for further details.
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The IDT77950 ATM switch is identified to the switching and signal-
ling software by an 8-bit switch identification which is determined via an
eight position signal pole signal throw DIP switch on the board. The
IDT77V550 reads this 8-bit information and sends it to the remote soft-
ware.
This identification must match the information on the SwitchBIOS
software. The Switch identification DIP Switch on the IDT77950 should
be set to the following positions for SwitchBIOS released version 2.0
and 3.0:
Switch Toggle
1
2
3
4
5
6
7
8
Position
ON
OFF OFF OFF
OFF
ON
ON
ON
3 of 3
April 3, 2001
IDT77950
CORPORATE HEADQUARTERS
2975 Stender Way
Santa Clara, CA 95054
for SALES:
800-345-7015
fax: 831-754-4608
www.idt.com
for Tech Support:
switchstarhelp@idt.com
phone: 831-775-4002
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
*Notice: The information in this document is subject to change without notice
This DIP Switch setting corresponds to a Switch Manager Control VCI of Ox1E. Please verify that the Switch Manager Control VCI i n SwitchBIOS
is set to this value before attempting to operate the Switch. If it does not match (the typical default value is 0x1F) use the procedure on page 39 of IDT
SwitchBIOS 3.0 Specification to modify the Switch Manager Control VCI to 0x1E. This edit must be made after every power on/off o peration with the
switch to insure the proper Switch Manager Control VCI.
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December 1997: Initial publication.
April 3, 2001: Changed AdvanceNet System NICStAR to SARWIN II NIC.
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Process/
Temperature
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77950
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Device
Type
IDT
4309 drw 02
SwichStar Reference Design - 1.24Gbps