Critical Issue
Description
The TimeQuest report may show minimum pulse width violation when you run full compilation on a soft-SERDES design.
Resolution
Specify the I/O standard for the clock pins so that the clock
pins perform better and runs with a higher speed. For example, if
you see pulse width violation on the rx_serial_clk and rx_serial_clk90 clock
inputs, in the .qsf file add the following commands:
set_instance_assignment -name IO_STANDARD LVCMOS -to
rx_serial_clk
set_instance_assignment -name IO_STANDARD LVCMOS -to
rx_serial_clk90