Voltage supply, Ucf location constraints, Related resources – Xilinx MIcroblaze Development Spartan-3E 1600E User Manual
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MicroBlaze Development Kit Spartan-3E 1600 Edition User Guide
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UG257 (v1.1) December 5, 2007
Voltage Supply
R
the X or Y values exceed their maximum value, an overflow condition. A ‘1’ indicates
when an overflow occurs. If the mouse moves continuously, the 33-bit transmissions repeat
every 50 ms or so.
The L and R fields in the status byte indicate Left and Right button presses. A ‘1’ indicates
that the associated mouse button is being pressed.
Voltage Supply
The PS/2 port on the MicroBlaze Development 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
.
UCF Location Constraints
provides the UCF constraints for the PS/2 port connecting, including the I/O
pin assignment and the I/O standard used.
Related Resources
x
PS/2 Mouse/Keyboard Protocol
x
PS/2 Keyboard Interface
x
PS/2 Mouse Interface
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 ;
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