Edulent interface is defined in entity section of main
VHDL module. It consists of the following signals: 8-bit
bidirectional data bus, clock input, 4-bit user control,
status report, and 8-bit in and out bus. Data bus, user
control and status report signals are used to be connected
to parallel port of personal computer. Clock, in and out
bus signals are provided from development board.
Interface signals are shown in Fig. 4.
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