General Description: Leonardo currently defaults all outputs with the slew rate set to FAST. The following describes how to change the slew rates
ソリューション
1
To set an output port with a FAST slew rate: set_attribute -port <portname> -name FAST
To set all other output ports with a SLOW slew rate: set xlx_fast_slew FALSE
Internal Note: Using M1.4 with Leonardo 4.2, one can not change the slew rate to slow via the ucf file
2
Leonardo also default input register to NODELAY. Here is how you can set a port with delay in Leonardo. Say, the signal going from ibuf to IFD is called data_in. After doing a 'READ' you can then do: