Spartan-3E Starter Kit Board User Guide www.xilinx.com 65UG230 (v1.0) March 9, 2006Voltage SupplyRVoltage SupplyThe PS/2 port on the Spartan-3E Starter Kit board is powered by 5V. Although theSpartan-3E FPGA is not a 5V-tolerant device, it can communicate with a 5V device usingseries current-limiting resistors, as shown in Figure 8-1.UCF Location ConstraintsFigure 8-6 provides the UCF constraints for the PS/2 port connecting, including the I/Opin assignment and the I/O standard used.Related Resources• PS/2 Mouse/Keyboard Protocolhttp://www.computer-engineering.org/ps2protocol/• PS/2 Keyboard Interfacehttp://www.computer-engineering.org/ps2keyboard/• PS/2 Mouse Interfacehttp://www.computer-engineering.org/ps2mouse/Figure 8-6: UCF Location Constraints for PS/2 PortNET "PS2_CLK" LOC = "G14" | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = SLOW ;NET "PS2_DATA" LOC = "G13" | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = SLOW ;
