adsp-21mod870-100 Analog Devices, Inc., adsp-21mod870-100 Datasheet - Page 2

• Manufacturer Part Number: adsp-21mod870-100
• Description: Internet Gateway Processor
• Manufacturer: Analog Devices, Inc.

ADSP-21mod870
EZ-ICE and SHARC are registered trademarks of Analog Devices, Inc.
This takes place while the processor continues to:
• Receive and transmit data through the two serial ports
• Receive and/or transmit data through the internal DMA port
• Receive and/or transmit data through the byte DMA port
• Decrement timer
Modem Software
The modem software executes general modem control, com-
mand sets, error correction and data compression, data modula-
tions (for example, V.90 and V.34), and host interface functions.
The host interface allows system access to modem statistics
such as call progress, connect speed, retrain count, symbol rate
and other modulation parameters.
The modem data pump and controller software reside in on-
chip SRAM and do not require external memory. You can
configure the ADSP-21mod870 dynamically by downloading
software from the host through the 16-bit DMA interface. This
SRAM-based architecture provides a software upgrade path to
future standards and applications, such as voice over IP.
The modem software is available as object code.
DEVELOPMENT SYSTEM
The ADSP-2100 Family Development Software, a complete set
of tools for software and hardware system development, sup-
ports the ADSP-21mod870. The System Builder provides a
high level method for defining the architecture of systems under
development. The Assembler has an algebraic syntax that is
easy to program and debug. The Linker combines object files
into an executable file. The Simulator provides an interactive
instruction-level simulation with a reconfigurable user interface
to display different portions of the hardware environment.
A PROM Splitter generates PROM programmer compatible
files. The C Compiler, based on the Free Software Foundation’s
GNU C Compiler, generates ADSP-21mod870 assembly source
code. The source code debugger allows programs to be cor-
rected in the C environment. The Runtime Library includes
over 100 ANSI-standard mathematical and DSP-specific
functions.
The ADSP-218x EZ-ICE
bugging of an ADSP-21mod870 system. The emulator consists
of hardware, host computer resident software, and the target
board connector. The ADSP-21mod870 integrates on-chip
emulation support with a 14-pin ICE-Port interface. This
interface provides a simpler target board connection that
BUS
ISA
®
Emulator aids in the hardware de-
ADSP-21061
SPORT
SHARC
HOST
FLASH
Figure 1. Evaluation/Reference Design Board
MEM
I/F
21mod870
21mod870
ADSP-
ADSP-
MODEM POOL
SPORT0
PORT
PORT
SPORT0
IDMA
IDMA
–2–
21mod870
21mod870
ADSP-
ADSP-
requires fewer mechanical clearance considerations than other
ADSP-2100 Family EZ-ICEs. The ADSP-21mod870 device
need not be removed from the target system when using the EZ-
ICE, nor are any adapters needed. Due to the small footprint of
the EZ-ICE connector, emulation can be supported in final
board designs.
The EZ-ICE performs a full range of functions, including:
• In-target operation
• Up to 20 breakpoints
• Single-step or full speed operation
• Registers and memory values can be examined and altered
• PC upload and download functions
• Instruction-level emulation of program booting and execution
• Complete assembly and disassembly of instructions
• C source-level debugging
See Designing An EZ-ICE-Compatible Target System in the
ADSP-2100 Family EZ-Tools Manual (ADSP-2181 sections) as
well as the Designing an EZ-ICE Compatible System section of
this data sheet for the exact specifications of the EZ-ICE target
board connector.
ADSP-21mod870 Reference Design/Evaluation Kit
The ADSP-21mod870-EV1 is a reference design/evaluation kit
that includes an ISA bus PC card that has an ADSP-21061L
SHARC
gateway processors and a T1 interface. The board is shipped
with an evaluation copy of the modem software and software
that runs on the PC. The PC software provides a user interface
that lets you run a modem session “right out of the box.” When
you run the modem in keyboard mode, characters typed on the
keyboard are transmitted to the other modem and characters
sent by the other modem are displayed on the screen. Data can
also be streamed through the COM port of the PC to send and
receive files and perform automated testing.
The modem system contains four ADSP-21mod870s connected
to an ADSP-21061 SHARC host processor. This design is ex-
tensible to 32 ADSP-21mod870s. The ADSP-21mod870s are
connected to a T1 interface. This accommodates testing with a
digital line. A diagram of the system is shown below in Figure 1.
The SHARC processor communicates to the PC through the
ISA bus. The SHARC acts as the modem system host and con-
trols the ADSP-21mod870-based modems connected to a DMA
bus. The code, written in C, runs on the SHARC and provides
an example of how the host loads code into the ADSP-21mod870s,
SPORT0
SPORT0
PORT
PORT
IDMA
IDMA
®
processor as a host, four ADSP-21mod870 Internet
ADSP-2183
LINE I/F
T1/ISDN
DIGITAL
TELCO
REV. 0