V3C31

The V3C31 is a general purpose digital signal processor for the 3U VME bus. It features a Texas Instrument's TMS320C31 clocked at 60MHz, stereo CD-quality input/output audio channels, up to 1.5MB SRAM and 2MB flash memory. The VME base address of the V3C31 board is selected by two hex rotary switches. Two LEDs on the front panel are user programmable as status indicators.

SRAM
The V3C31 comes standard with 512kB of zero wait-state SRAM. On board sockets accommodate an additional 1MB of one wait-state SRAM.

Flash Memory
The 512kB of flash memory can contain the user's application software which the V3C31 copies into its SRAM when powered up. Flash memory can be added in 512kB increments up to a total of 2MB.

Serial Port
An RS232 com port is available through a 4-pin latching Molex connector on the endplate.

Jumper Options

• AC coupled
• DC coupled centered at ground
• DC coupled centered at 2.5v
• Electret microphone bias
• 150 ohms analog input termination
• 60 ohms analog input termination

Software
The V3C31 board is provided with a C-callable host software interface library and software drivers for SunOS and Solaris. The host interface library allows access and control of the V3C31 board by providing the following functions:

• Open/close the board for access
• Initialize the board
• Set/read the board's control parameters
• Download a C31 COFF executable file
• Read symbol information from COFF file
• Start/halt execution of the DSP's program
• Upload/download data as a long int, a float, or an array of long ints
• Read/write a value from the flash memory
• Erase a sector in the flash memory space

See TI TMS320C3x Applications for details on TI's C3x software tools.

Audio Channels
A Crystal Semiconductor CS4231A stereo multimedia CODEC provides single-ended line-in and line-out audio channels. Access to the signals are via four miniature SMB connectors on the endplate. The CS4231A uses sigma-delta modulation, 64x over-sampling, 16-bit resolution, and auto-tracking anti-aliasing/reconstruction filter. Sampling rate, gain, attenuation, linear (16-bit & 8-bit), A-law, µ-law, and ADPCM formats are software selectable.

Analog Specifications

ADC

DAC

Specifications