ADSP-21MOD970-110 查看數據表（PDF） - Analog Devices
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ADSP-21MOD970-110 Datasheet PDF : 6 Pages
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ADSP-21mod970-110
T1
E1
PRI
xDSL
ATM
FRAMER
DMA
ADSP-21mod970
SP0
DMA
ADSP-21mod970
SP0
PORT LINK
BUS
DMA
ADSP-21mod970
SP0
DMA
ADSP-21mod970
SP0
DMA
ADSP-21mod970
SP0
DMA
ADSP-21mod970
SP0
DMA
ADSP-21mod970
SP0
HOST
ADSP-2183
DMA
ADSP-21mod970
SP0
LAN
OR
INTERNET
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
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.
MEMORY DMA
I/F
PORT
SERIAL
PORT
ADSP-21mod970
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.
MEMORY DMA
I/F
PORT
ADSP-21mod970
ADSP-21mod970
HOST
ADSP-21mod970
ADSP-21mod970
TELCO PCM
I/F
HOST
ADSP-21mod970
ADSP-21mod970
TELCO PCM
I/F
Figure 3. Parallel Telco PCM Data Stream Architecture
ADSP-21mod970
Figure 2. Serial Telco PCM TDM Data Stream Architecture
–2–
REV. 0
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