ADSP-21mod870-110

REV. 0

Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements 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 Analog Devices.

ADSP-21mod870-110

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700

World Wide Web Site: http://www.analog.com

Fax: 781/326-8703

© Analog Devices, Inc., 1999

Internet Gateway Processor Software

FEATURES
ISDN B-Channel HDLC
DATA Modulations

CCITT V.90 (30k56k)
K56FlexTM (30k56k)
ITU-T V.34: 33600 Bits/s2400 Bits/s
CCITT V.32bis: 14400 Bits/s7200 Bits/s
CCITT V.32: 9600 Bits/s, 4800 Bits/s
CCITT V.23
CCITT V.22/V.22bis: 2400, 1200, 600 Bits/s
CCITT V.21: 300 Bits/s
Bell 212A: 1200 Bits/s
Bell 103: 300 Bits/s

Start-Up Procedures:

ITU-T V.8

Error Correction and Data Compression:

CCITT V.42 Error Correction (LAPM and MNP2-4)
CCITT V.42bis Data and MNP Class 5 Compression

FAX Modem

V.17/V.29/V.27ter/V.21 Channel 2
T.30 Protocol

V.120
V.110
PPP Asynchronous Framing Support (RFC 1662)
Low Power

80 mW Typical Active
Low Power and Sleep Modes

High Density

100-Lead LQFP Package
On-Chip DS0/DS1 Interface
Full Function DMA Port
No External Memory Required
0.4 Square Inch per Complete Modem Port

3.3 V Supply
Fully Upgradable RAM-Based Architecture
Fast Download

Full Image in 5 ms

High Speed 16-Bit Port Link Bus Provides Simple

Interface Between Host and Modem Pool

INTRODUCTION

The ADSP-21mod870-110 is a complete single chip. All data-
pump and controller functions are implemented on a single
0.4 square-inch chip. This modem package allows the highest
modem port density, while achieving the lowest power con-
sumption in a software upgradable platform.

The ADSP-21mod870-110 is designed for high density systems
such as remote access servers (see Figure 1). Its high perfor-
mance DSP core, large on-chip SRAM, TDM serials port and
16-bit DMA port provide efficient control and data communi-
cation with minimal chip count. The modem software provides
a number of data modulations, such as V.34, 56K bps PCM,
and ISDN with a software upgrade path to future standards,
and new applications, such as voice over network. The host
interface allows system access to modem statistics such as call
progress, connect speed and modulation parameters such as
retrain count and symbol rate.

ON-CHIP SRAM

The ADSP-21mod870-110 processor integrates 160K bytes of
on-chip memory. The modem datapump and controller soft-
ware, as well as data storage, are contained in the on-chip SRAM.
The SRAM cells are designed by Analog Devices. These cells
are optimized for high speed digital signal processing and low
power consumption. You can dynamically configure the ADSP-
21mod870 with software through the 16-bit DMA interface.

DMA INTERFACE

The 16-bit internal DMA port (IDMA port) provides transpar-
ent, direct access to the on-chip RAM of the ADSP-21mod870
processor. This high speed access to on-chip memory simplifies
control and data communication and system debug. Use the
16-bit DMA interface to dynamically configure the ADSP-
21mod870 with software.

K56Flex is a trademark of Rockwell International and Lucent Technologies.

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ADSP-21mod870-110

SERIAL PORTS

The ADSP-21mod870 processor incorporates two complete
synchronous, double-buffered serial ports for serial communi-
cations. The serial ports interface directly to a time-division
multiplexed (TDM) 1544 kbps (T1) or 2048 kbps (E1) serial
stream, to an 8K sample/s data stream, or to an 8-bit companded
(64 kb/s) data stream (DS0). The serial ports operate under
modem software control.

SUPPORTED SYSTEM ARCHITECTURES

The ADSP-21mod870-110 Internet Gateway Processor Soft-
ware supports two system architectures: serial Telco PCM TDM
data stream and parallel Telco PCM data stream. The two archi-
tectures are differentiated by the method of proving Telco
PCM data to the DSP Modem.

Serial Telco PCM TDM Data Stream Architecture

The serial Telco PCM TDM data stream architecture, shown
in Figure 2, is the most common architecture. In this architec-
ture, the modem pool may have a local Telco interface that
provides a serial TDM data stream of Telco PCM data to the
DSP through the DSP's Serial Port. You can connect up to
24/32 DSPs, through the Serial Port, to a 24/32 channel serial
TDM data stream.

ADSP-

21mod870

HOST

TELCO PCM

I/F

ADSP-

21mod870

ADSP-

21mod870

ADSP-

21mod870

SERIAL PORT

DMA PORT

MEMORY I/F

Figure 2. Serial Telco PCM TDM Data Stream Architecture

Parallel Telco PCM Data Stream Architecture

The parallel Telco PCM data stream architecture, shown in
Figure 3, provides a single bus interface for all data and control.
In this architecture, the modem pool may have a remote Telco
interface that provides a parallel data stream of Telco PCM data
to the DSP through the DSP's DMA Port. An arbitrary number
of DSPs can be connected, through the DMA Port, to a Host
that provides the parallel data stream.

Note: The number of parallel DSPs is limited only by the soft-
ware loading constraints on the Host.

ADSP-

21mod870

HOST

TELCO PCM

I/F

ADSP-

21mod870

ADSP-

21mod870

ADSP-

21mod870

DMA PORT

MEMORY I/F

Figure 3. Parallel Telco PCM Data Stream Architecture

ADSP-

21mod870

IDMA

SP0

ADSP-

21mod870

IDMA

SP0

ADSP-

21mod870

IDMA

SP0

ADSP-

21mod870

IDMA

SP0

LINE

INTERFACE

CALL

CONTROL

T1, E1,

PRI, xDSL,

ATM

PORT LINK

BUS

(ADSP-2183)

LAN OR

INTERNET

V.34/56k MODEM

V.17 FAX

V.42, V.42bis, MNP2-5

ADSP-21mod870 FUNCTIONS

DTMF DIALING

CALLER ID

HDLC PROTOCOL

HOST FUNCTIONS

MULTI-DSP CONTROL, OVERLAY
MANAGEMENT AND DATA TRANSFERS

HOST

ADSP-

21mod870

IDMA

SP0

ADSP-

21mod870

IDMA

SP0

ADSP-

21mod870

IDMA

SP0

ADSP-

21mod870

IDMA

SP0

Figure 1. ADSP-21mod870 Network Access System

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ADSP-21mod870-110

Modem Statistics

Several modem statistics can be gathered through the IDMA
port. These statistics include call status, modulation in use,
connect rate, transmit and receive data rate, symbol rate, retrain
count, rate renegotiation count and others. Table II and Table
IV contain a complete listing of available modem statistics.

Modem Configuration

The modem is configured by programming various parameters
through the IDMA port. Table III and Table V contain com-
plete lists of modem configuration parameters.

Table II. Shell Status

Reference #

Function

SS. 0

Product Number

SS. 1

Application Version

SS. 2

Application Type

SS. 3

Programmable Flag Data

Table III. Shell Parameters

Reference #

Function

SP. 0

Serial Port Tx Time Slot

SP. 1

Serial Port Rx Time Slot

SP. 2

Serial Port Configuration

SP. 3

Programmable Flag Control

SP. 4

Programmable Flag Data

SP. 5

Host Interrupt Count

SOFTWARE INTERFACE

Analog Devices provides sample C code for the software inter-
face to the ADSP-21mod870-110. The software interface en-
compasses the following four areas--download, control interface,
data interface and modem statistics.

Download

The IDMA port on the ADSP-21mod870-110 contains an
autoincrementing address generator. The host writes the start-
ing address of the transfer and then writes the first word of
data. After the first write, the IDMA address generator auto-
matically increments; the host writes the next data word and
the IDMA transfers that word to the next location in ADSP-
21mod870-110 memory.

The executable image contains code and data that must be
loaded into program and data memory. Program memory on
the ADSP-21mod870-110 is 24 bits wide, therefore two trans-
fers are used to load each word of program memory.

The host begins the download by asserting the

RESET pin of

the ADSP-21mod870-110. The host then transfers all code and
data. All internal memory can be loaded in 5 ms.

Control Interface

The ADSP-21mod870-110 is controlled through two FIFOs in
DSP memory. The host sends a control event by writing to the
host-to-modem FIFO. The ADSP-21mod870-110 posts events
to the host by writing into the modem-to-host FIFO.

Data Interface

All data transferred to and from the ADSP-21mod870-110
passes through word FIFOs located in internal memory on the
ADSP-21mod870. The FIFOs are accessed through a control
structure that contains a pointer to the start of the FIFO in
memory, the length of the FIFO in 16-bit words, a pointer to
the next address to be read, and a pointer to the next address to
be written. The transmit and receive FIFOs are 1024 bytes
deep. Example code providing primitives for accessing the
byte-FIFOs is available from Analog Devices. Table I shows an
example of a data FIFO.

Table I. FIFO Example

BASE

RD_ptr

WR_ptr

BASE + SIZE

INFO

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ADSP-21mod870-110

Table IV. Modem Status

Reference #

Function

MS. 0

Data Modulation State

MS. 1

SNR MSE Measure

MS. 2

Rx Level dBm

MS. 3

Tx Level dBm

MS. 4

Tx V.34 Symbol Rate

MS. 5

Rx V.34 Symbol Rate

MS. 6

Round Trip Delay

MS. 7

Telemetry Data Update

MS. 8

Constellation X

MS. 9

Constellation Y

MS. 10

Variable 2 X Pointer

MS. 11

Variable 2 Y Pointer

MS. 12

Variable 3 X Pointer

MS. 13

Variable 3 Y Pointer

MS. 14

Variable 4 X Pointer

MS. 15

Variable 4 Y Pointer

MS. 16

Data Modulation Monitor Retrain Local Count

MS. 17

Data Modulation Monitor Retrain Remote Count

MS. 18

Data Modulation Monitor Retrain Auto Count

MS. 19

Data Modulation Monitor Renegotiate Local
Count

MS. 20

Data Modulation Monitor Renegotiate Remote
Count

MS. 21

Data Modulation Monitor Renegotiate Auto
Count

MS. 22

Omc Carrier Family

MS. 23

Omc Disconnect Reason

MS. 24

Omc State

MS. 25

Omc Time

MS. 26

Omc Idle Time Start

MS. 27

Omc Data Protocol Time Start

MS. 28

Omc Initial Rx Data Rate

MS. 29

Omc Current Rx Data Rate

MS. 30

Omc Initial Tx Data Rate

MS. 31

Omc Current Tx Data Rate

MS. 32

Data Protocol

MS. 33

Data Protocol Compression

MS. 34

Data Protocol Rx HDLC Error Frame Count

MS. 35

Data Protocol Rx HDLC Frame Count

MS. 36

Data Protocol Tx HDLC Frame Count

MS. 37

Data Protocol Tx Data Frame Count

MS. 38

Data Protocol Tx Data Frame Retransmit Count

MS. 39

Data Protocol Rx Data Frame Count

MS. 40

Data Protocol Rx Data Frame Missing Count

MS. 41

Data Modulation Monitor Retrain Remote
Count

MS. 42

Data Protocol Call Tx Data Compressibility
Metric

MS. 43

Data Protocol Call Rx Data Compressibility
Metric

MS. 44

Data Protocol Call Tx Data Metric

MS. 45

Data Protocol Call Rx Data Metric

MS. 46

V.PCM Digital Attenuation

MS. 47

V.PCM Robbed Bit Mask

MS. 48

V.PCM Coding Law

Table V. Modem Parameters

Reference #

Function

MP. 0

Omc Data Modulation Originate Enable

MP. 1

Dial Billing Delay Duration

MP. 2

Omc Data Modulation/Data Protocol
Maximum Start-Up Duration

MP. 3

Data Protocol Start Delay

MP. 4

Data Protocol Allowed Mask

MP. 5

Data Protocol Preferred Mask

MP. 6

Data Protocol Auto-Select Mask

MP. 7

Data Protocol Compression Mask

MP. 8

Data Protocol Cmn Binary Enable

MP. 9

Data Protocol Cmn HDLC Enable

MP. 10

Data Protocol LAPM to Sync

MP. 11

Data Protocol MNP Block Mode Enable

MP. 12

Data Protocol MNP Data Compression Select

MP. 13

Data Protocol MNP Header Optimize Enable

MP. 14

Data Protocol MNP Maximum Data Size

MP. 15

Data Protocol MNP Service Class

MP. 16

Data Protocol Disconnect Management Mode

MP. 17

Data Protocol Disconnect Management
Duration

MP. 18

Digital Data Modes

MP. 19

Pump Data Modes

MP. 20

Pump Tone Transmit Level

MP. 21

Pump Transmit Level

MP. 22

Pump V.34 Transmit Level

MP. 23

Data Modulation Carrier Detect Duration

MP. 24

Data Modulation Carrier Loss Disconnect
Timer Duration

MP. 25

Data Modulation Line Quality Monitor Mode

MP. 26

Data Modulation Options Mask

MP. 27

Data Modulation V.32 Rate Enable Mask

MP. 28

Data Modulation V.34 Data Rate Mask

MP. 29

V.PCM Maximum Power

MP. 30

V.PCM Reference Point

MP. 31

K56 RBS Maximum

MP. 32

K56 Tx Data Rate Maximum

MP. 33

K56 Tx Data Rate Minimum

MP. 34

DTE Interface Big Endian

MP. 35

PPP Rx Mode Enable

MP. 36

PPP Tx Mode Enable

MP. 37

PPP Detect Enable

MP. 38

PPP Rx ACCM

MP. 39

PPP Tx ACCM

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