Texas Instruments TMS320C3 Series, User Manual, Page: 143 / 166

Hardware Component Overview
B-3 DSK Circuit Board Dimensions and Schematic Diagrams
B.1 Hardware Component Overview
This section describes the basic functions of the DSK components:
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Expansion connectors — The four 32-pin headers allow you to develop
add-on cards that can directly interface to all of the ’C31 signals.
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Jumper block header — An 11-pin jumper block connects the ’C31 serial
port to the TLC32040 AIC. Removal of the jumpers disconnects the AIC
from the ’C31 serial port, so that a daughtercard can use the serial port
signals.
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Host interface logic — The host interface logic consists of a program-
mable array logic (PAL) 22V10Z and two high-speed octal bus transceiv-
ers with tri-state outputs (74ACT245). These devices interface the ’C31
with the host parallel printer port. This interface logic supports 8-bit bidirec-
tional or 4-bit unidirectional data modes of the PC host.
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Oscillator — The on-board 50Mhz oscillator drives the ’C31 clock input.
The ’C31 internal clock value is divided by 1 (same frequency).
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Parallel printer port connector — The DB25 25-pin connector connects
directly to the host parallel printer port.
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RCA jacks — The RCA jacks supply analog input or output and are routed
to the I/O pins of the AIC.
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Resettable fuses — The polyswitch resettable fuses interrupt the flow of
excessive current. The fuses reset after they cool down and the faulty
condition is corrected. The fuses require no manual resetting or replace-
ment.
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TLC32040 AIC — The analog interface circuit provides the ’C31 access
to the analog world. The AIC samples analog data and converts it into a
digital stream for ’C31 analysis. The ’C31 operates on this digital data and
returns the “transformed” digital data to the AIC for conversion into an ana-
log signal.
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TMS320C31 — The main processor is a 32-bit, floating-point digital signal
processor. You develop application code and load it to the on-chip memory
of the ’C31. This code can be executed, single-stepped, and viewed in the
debugger.