Is it possible to declare multiple constraints for a single net using only one UCF line?
There is no provision in the 4.1i software that allows the declaration of multiple constraints on a single net using a single UCF line. Each constraint must be declared individually, even for the same net.
The 5.1i software, which is due to be released in September of 2002, will support the declaration of multiple constraint on a single line. The syntax is supported on NET, INST, and PIN constraints.
The following is an example of the new syntax:
NET myNet LOC = P54 | IOSTANDARD = LVPECL | SLEW = FAST ;