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Connector Interface
The CPLD Module supports an
RS-232 interface via the DB-9 Male connector. The received serial data from Pin
2 of the DB-9 is brought to logic levels via inversion from a MAX 233 and is
made available on Pin 12 of CPLD 1. The data to be transmitted is presented at
Pin 73 of CPLD 1, which appears on Pin 3 of the DB-9 after being inverted by
the MAX 233. Please see /mit/6.111/vhdl/serial/ for VHDL code that
emulates a receiver and a transmitter.