Digilent 410-087P-KIT - Manual (Page 65)

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