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