LED - muneeb-mbytes/FPGABoard_edgeSpartan6 GitHub Wiki
NET "led<0>" LOC = p33; #LSB
NET "led<1>" LOC = p32;
NET "led<2>" LOC = p30;
NET "led<3>" LOC = p29;
NET "led<4>" LOC = p27;
NET "led<5>" LOC = p26;
NET "led<6>" LOC = p24;
NET "led<7>" LOC = p23;
NET "led<8>" LOC = p138;
NET "led<9>" LOC = p143;
NET "led<10>" LOC = p142;
NET "led<11>" LOC = p137;
NET "led<12>" LOC = p141;
NET "led<13>" LOC = p134;
NET "led<14>" LOC = p140;
NET "led<15>" LOC = p139; #MSB
NET "signal_name " LOC = <pin_name>;
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NET "signal_name" specifies the name of the signal connected to the pin. In this case, the signal name is "led", where "n" is the index of the LED from 0 to 15.
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LOC = <pin_name> specifies the physical location of the pin on the FPGA device. The pin_name corresponds to the pin number or name on the specific FPGA device.
For example:
NET "led<0>" LOC = p33; #LSB assigns the first LED (LSB) to pin p33 on the FPGA device.
NET "led<15>" LOC = p139; #MSB assigns the last LED (MSB) to pin p139 on the FPGA device.