GENERAL DESCRIPTION

The ADSP-21mod980N is a multi-port Internet gateway processor optimized for implementation of a complete V.34/V.90 digital modem. All datapump and controller functions can be implemented on a single device, offering the lowest power consumption and highest possible modem port density.

The ADSP-21mod980N combines the ADSP-2100 Family base architecture (three computational units, data address generators, and a program sequencer) with two serial ports, a 16-bit internal DMA port, a byte DMA port, a programmable timer, Flag I/O, extensive interrupt capabilities, and on-chip program and data memory.

PERFORMANCE FEATURES

Complete Single Device Multi-Port Internet Gateway

Processor (No External Memory Required)

Implements Sixteen Modem Channels or Forty Voice

Channels in One Package

Each DSP Can Implement two V.34/V.90 Data/Fax

Modem Channels (includes Datapump and

Controller)

Low Power Version: 640 MIPS Sustained Performance,

12.5 ns Instruction Time @ 1.9 Volts nominal

(internal)

Open Architecture Extensible to Voice-over-Network

(VoN) and Other Applications

Low Power Dissipation, 25 mW (typical) per Channel

Powerdown Mode Featuring Low CMOS Standby Power

Dissipation

INTEGRATION FEATURES

ADSP-2100 Family Code-Compatible, with Instruction

Set Extensions

16 Mbits of On-Chip SRAM, Configured as 9 Mbits of

Program Memory and 7 Mbits of Data Memory

Dual-Purpose Program Memory, for Both Instruction

and Data Storage

352-Ball PBGA with a 35mm x 35mm footprint

SYSTEM CONFIGURATION FEATURES

16-Bit Internal DMA Port for High-Speed Access to

On-Chip Memory (Mode-Selectable)

Programmable Multichannel Serial Port Supports 24/32

Channels

Two Double-Buffered Serial Ports with Companding

Hardware and Automatic Data Buffering

Separate Reset Pins for Each Internal Processor