Analog Devices ADSP-21mod970-110 Datasheet
Multiport Internet
a
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 kbps–56 kbps)
K56Flex™ (30 kbps–56 kbps)
ITU-T V.34: 33600 Bits/s–2400 Bits/s
CCITT V.32bis: 14400 Bits/s–7200 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
Gateway Processor Solution
ADSP-21mod970-110
INTRODUCTION
The ADSP-21mod970-110 is a six-channel solution intended
for remote access server and remote access concentrator applications. 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 number of data modulations, such as V.34, 56 kbps 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-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 transparent, direct access to the on-chip RAM of the ADSP-21mod970-110
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 ADSP21mod970-110 with software.
K56Flex is a trademark of Rockwell International and Lucent Technologies.
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.
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
ADSP-21mod970-110
PRI
xDSL
ATM
DMA
ADSP-21mod970
SP0
T1
E1
FRAMER
PORT LINK
BUS
DMA
ADSP-21mod970
SP0
ADSP-21mod970 FUNCTIONS
V.34/56k MODEM
V.17 FAX
V.42, V.42bis, MNP2-5
DMA
ADSP-21mod970
SP0
DMA
ADSP-21mod970
SP0
DTMF DIALING
CALLER ID
HDLC PROTOCOL
Figure 1. ADSP-21mod970 Network Access System
SERIAL PORTS
The ADSP-21mod970-110 processor incorporates two complete
synchronous, double-buffered serial ports for serial communications. 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 Processor supports two system architectures: serial Telco PCM TDM
data stream and parallel Telco PCM data stream. The two architectures 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.
MEMORY
I/F
DMA
PORT
SERIAL
PORT
DMA
ADSP-21mod970
SP0
DMA
ADSP-21mod970
SP0
HOST FUNCTIONS
MULTI-DSP CONTROL, OVERLAY MANAGEMENT
AND DATA TRANSFERS
DMA
ADSP-21mod970
SP0
DMA
ADSP-21mod970
SP0
HOST
ADSP-2183
LAN
OR
INTERNET
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 software loading constraints on the Host.
HOST
MEMORY
I/F
DMA
PORT
ADSP-21mod970
ADSP-21mod970
ADSP-21mod970
ADSP-21mod970
ADSP-21mod970
ADSP-21mod970
HOST
ADSP-21mod970
ADSP-21mod970
TELCO PCM
I/F
Figure 2. Serial Telco PCM TDM Data Stream Architecture
Figure 3. Parallel Telco PCM Data Stream Architecture
–2–
TELCO PCM
I/F
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