SigC54xx MP3 Real-Time System

In addition to general development features and popular host environment support (MATLAB, C/C++, etc.) provided by the SigC54xx Development System, the MP3 Development System includes a user-interface "control panel" which provides common MP3 development functions, including:

• input/output to serial port card in the PC

• input/output to TIM, WAV, or ASCII text waveform files

• raw and processed data display, both in time domain and in frquency domain, including 3-D spectrogram and 2-D spectrograph

• real-time measurement capability (e.g. frames per sec)

• mode control; e.g. file-based simulation, real-time audio input, etc.

• real-time control over MP3 DSP code (e.g. analysis mode, synthesis mode, combined mode)

The MP3 Production System is composed of a multi-module site board in PC/104 form-factor. This board, called the SigC54xx-PC/104, contains four (4) SODIMM module sites, host PC interface, digital I/O (RS-232 and RS-423) interface and connectors, JTAG debug headers, standard PC/104 bus connectors, and 100-pin "Global Bus" connector for peripheral expansion.

The SigC54x-PC/104 board can accept SigC54xx-SODIMM multiprocessor modules, and SigSD4-SODIMM Audio Modules. A standard SigC549-SODIMM module contains three (3) 100 MHz C549 processors and three (3) sets of 128k x 16 SRAM devices. A standard SigSD4-SODIMM module contains two (2) 16-bit, 2-channel sigma-delta codec analog I/O devices and interface circuitry. Audio Modules provide a multiplexed, 128-bit frame, 4-channel serial bitstream suitable for digital I/O interface to SigC54xx processor modules.

Features of the SigC54xx-PC/104 board include:

• fully conforms to PC/104 board footprint, height, and stacking requirements

• contains four (4) 72-pin SODIMM sockets, mounted flat (horizontally) on the PC/104 board, two (2) on each side. The approximate area consumed by the SODIMM sockets is 2.5" x 2.75", well within the 3.5" x 3.75" PC/104 board space, and leaves ample room for peripheral circuitry and connectors. The horizontal, flat sockets are surface mount and provide three (3) side PCB containment and spring-loaded metal side brackets which snap into PCB guide holes, offering improved reliability and shock / vibration resistance over vertical or angled SIMM or other mezzanine. See Figure 1 below, SODIMM Module and Socket Example.

  
  Figure 1 SODIMM Module and Socket Example

• can accept up to four (4) SigC54xx-SODIMM modules, each containing up to three (3) 100 MHz C549 or C5420 DSP processors, and up to three (3) sets of 128k x 16 dedicated local SRAM per processor, organized as 32k x 16 data SRAM, and 96k x 16 program SRAM. A maximum of four (4) modules provides a total of 1200 MIPS; using future pin-compatible modules with dual-core C5420 devices will increase total MIPS to 2400 or more.

• contains a 100-pin, 32-bit "Global Bus" digital I/O connector, compatible with other SigXXX PC/104 expansion boards (see, for example, the SigC44-PC/104 board)

• contains multiprocessor host-port interface circuitry compatible with DirectDSP, and Hypersignal software development tools, which provide standard, off-the-shelf software development tool support during development phases of any project involving SigC54xx-PC/104 boards, as well as field test, measurement, and data gathering capabilities.

• contains boot EPROM site and processor boot-option jumper header, to allow host-independent, stand-alone operation

• contains RS-423 drivers and serial format conversion circuitry, in order to convert C54xx processor synchronous serial data output (for example containing vocoded audio), to asynchronous serial data format

• can be specified to use industrial grade (-40 °C to 85 °C components) where possible

• contains standard JTAG 1149.1 header for debugging purposes