Äîêóìåíòàöèÿ è îïèñàíèÿ www.docs.chipfind.ru

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-21mod970-110

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

Multiport Internet

Gateway Processor Solution

FEATURES
High Density

Implements Six Modem Channels in One Package

304-Ball PBGA with a 1.45 Square Inch (961 sq. mm.)

Footprint

ISDN B-Channel HDLC
DATA Modulations

CCITT V.90 (30 kbps56 kbps)
K56FlexTM (30 kbps56 kbps)
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 per Channel Typical Active
Low Power and Sleep Modes
On-Chip DS0/DS1 Interface
Full Function DMA Port
No External Memory Required

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

K56Flex is a trademark of Rockwell International and Lucent Technologies.

INTRODUCTION

The ADSP-21mod970-110 is a six-channel solution intended
for remote access server and remote access concentrator applica-
tions. It combines a highly integrated DSP processor with
downloadable software. All datapump and controller functions
are implemented on a single 1.45-square-inch chip. This modem
package allows the highest modem port density while achieving
the lowest power consumption in a software upgradable platform.

The ADSP-21mod970-110 is designed for high-density systems
such as remote access servers, see Figure 1. Its high performance
DSP core, large on-chip SRAM, TDM serial port and 16-bit
DMA port provide efficient control and data communication
with minimal chip count. The modem software provides a num-
ber of data modulations, such as V.34, 56 kbps PCM and ISDN
with a software upgrade path to future standards and new appli-
cations, 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-21mod970-110 processor integrates 960K bytes
of on-chip memory. The modem datapump and controller
software, 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-21mod970-110 with software through the 16-bit DMA
interface.

DMA INTERFACE

The 16-bit internal DMA port (DMA Port) provides transpar-
ent, direct access to the on-chip RAM of the ADSP-21mod970-110
processor. This high speed access to on-chip memory simpli-
fies control and data communication and system debug. Use the
16-bit DMA interface to dynamically configure the ADSP-
21mod970-110 with software.

REV. 0

ADSP-21mod970-110

DMA

ADSP-21mod970

SP0

LAN

INTERNET

PRI

xDSL

ATM

DMA

ADSP-21mod970

SP0

DMA

ADSP-21mod970

SP0

DMA

ADSP-21mod970

SP0

DMA

ADSP-21mod970

SP0

DMA

ADSP-21mod970

SP0

PORT LINK
BUS

DMA

ADSP-21mod970

SP0

DMA

ADSP-21mod970

SP0

HOST

ADSP-2183

ADSP-21mod970 FUNCTIONS

V.34/56k MODEM
V.17 FAX
V.42, V.42bis, MNP2-5

DTMF DIALING
CALLER ID
HDLC PROTOCOL

HOST FUNCTIONS
MULTI-DSP CONTROL, OVERLAY MANAGEMENT
AND DATA TRANSFERS

FRAMER

Figure 1. ADSP-21mod970 Network Access System

SERIAL PORTS

The ADSP-21mod970-110 processor incorporates two complete
synchronous, double-buffered serial ports for serial communica-
tions. 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-21mod970-110 Multiport Internet Gateway Proces-
sor 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 architecture,
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-21mod970

TELCO PCM

I/F

HOST

MEMORY

I/F

DMA

PORT

SERIAL

PORT

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-21mod970

TELCO PCM

I/F

HOST

MEMORY

I/F

DMA

PORT

Figure 3. Parallel Telco PCM Data Stream Architecture

REV. 0

ADSP-21mod970-110

SOFTWARE INTERFACE

Analog Devices provides sample C code for the software inter-
face to the ADSP-21mod970-110. The software interface en-
compasses the following four areas--download, control interface,
data interface and modem statistics.

Download

The DMA Port on the ADSP-21mod970-110 contains an auto-
incrementing address generator. The host writes the starting
address of the transfer and then writes the first word of data.
After the first write, the DMA address generator automatically
increments; the host writes the next data word and the DMA
transfers that word to the next location in ADSP-21mod970-
110 memory.

The executable image contains code and data that must be
loaded into program and data memory. Program memory on the
ADSP-21mod970-110 is 24 bits wide, therefore two transfers
are used to load each word of program memory.

The host begins the download by asserting the

RESET pin of

the ADSP-21mod970-110. The host then transfers all code and
data. All internal memory can be loaded in 5 ms.

Control Interface

The ADSP-21mod970-110 is controlled through two FIFOs in
DSP memory. The host sends a control event by writing to the
host-to-modem FIFO. The ADSP-21mod970-110 posts events to
the host by writing into the modem-to-host FIFO.

Data Interface

All data transferred to and from the ADSP-21mod970-110
passes through word FIFOs located in internal memory on the
ADSP-21mod970-110. 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 ex-
ample of a data FIFO.

Table I. FIFO Example

INFO

BASE

PD_PTR

WR_PDR

BASE + SIZE

Modem Statistics

Several modem statistics can be gathered through the DMA
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 DMA Port. Table III and Table V contain complete
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

REV. 0

ADSP-21mod970-110

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

REV. 0

ADSP-21mod970-110

ORDERING GUIDE

Package

Part Number

Description

Processor Clock

Package Description

Option

ADSP-21mod970-110 with

312 MIPS DSP with Modem

Unit Software License

Software Unit License

26.0 MHz

304 Plastic Ball Grid Array

BP-304

RELATED DOCUMENTS

For further information see the ADSP-21mod970 Multiport Internet Gateway Processor data sheet.

ESD SENSITIVITY

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection. Although
the ADSP-21mod970-110 features proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precau-
tions are recommended to avoid performance degradation or loss of functionality.

WARNING!

ESD SENSITIVE DEVICE

REV. 0

ADSP-21mod970-110

OUTLINE DIMENSIONS

Dimensions shown in inches and (mm).

C349325/99

PRINTED IN U.S.A.

304-Plastic Ball Grid Array

(BP-304)

0.048 (1.22)
0.046 (1.17)
0.044 (1.12)

SEATING

PLANE

0.008 (0.20)

MAX

DETAIL A

0.035 (0.90)
0.030 (0.75)
0.024 (0.60)

BALL DIAMETER

0.024 (0.62)
0.022 (0.56)
0.020 (0.50)

0.028 (0.70)
0.024 (0.60)
0.020 (0.50)

DETAIL A

0.100 (2.54)
0.092 (2.33)
0.083 (2.12)

1.224 (31.10)
1.220 (31.00) SQ
1.217 (30.90)

1.051 (26.70)
1.037 (26.35) SQ
1.024 (26.00)

TOP VIEW

0.050 (1.27)

BSC

1.104 (28.04)
1.100 (27.94)
1.096 (27.84)

0.050 (1.27)

BSC

BOTTOM VIEW

A
B
C
D
E
F
G
H
J
K
L
M
N
P
R
T
U
V
W
Y
AA
AB
AC

23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

NOTE
THE ACTUAL POSITION OF THE BALL POPULATION IS WITHIN 0.011 (0.30)
OF ITS IDEAL POSITION RELATIVE TO THE PACKAGE EDGES. THE
ACTUAL POSITION OF EACH BALL IS WITHIN 0.004 (0.10) OF ITS IDEAL
POSITION RELATIVE TO THE BALL POPULATION.

1.104 (28.04)
1.100 (27.94)
1.096 (27.84)

Part Number ADSP-21MOD970-110