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Wiring the Xilinx Chip

Once you've designed and simulated the Triscuit and mapped it to the Xilinx part using the xxx program, you will need to wire everything up. That means taking those pins on the Xilinx part that you assigned signals to and actually putting wires on them. Which brings up the question of ``where are those pins on the socket?'' Figure 5 is a drawing of the Xilinx socket as seen from the wirewrap side of the board and tells you where each of the pins are on the socket. There are a couple pins to pay particular attention to. Pin 54 must be tied high for the Xilinx part to work correctly. Also, pin 55 is a pin that starts out low, and then goes high once the Xilinx part is correctly programmed. You may want to check this pin after power-up to make sure that the Xilinx part is correctly programmed. It takes less than a second to program the Xilinx part so you won't need to wait long to check that pin.

Figure 5: Xilinx Chip Pinout, as seen from Wiring Side

Erik Brunvand
Sat Nov 29 15:21:21 MST 1997