Description

When I attempt to lock my pins using the following constraint:

INST Base_0/*S4 LOC=SLICE_X3Y119;

INST Base_0/*S4 BEL= D6LUT;

INST Base_0/*S4 LOCK_PINS=I0:A1,I1:A2,I2:A3,I3:A4,I4:A5,I5:A6;

I receive an error similar to the following:

"ERROR:Pack:1676 - Error parsing LOCK_PINS constraint I0:A1, I1:A2, I2:A3, I3:A4,I4:A5, I5:A6. Logical input I1 is not a valid logical input."

How can I prevent this error?

Solution

To work around this error, lock down the placement of the LUT pins using the "ALL" keyword.

Example:

INST Base_0/*S4 LOC=SLICE_X3Y119;

INST Base_0/*S4 BEL= D6LUT;

INST Base_0/*S4 LOCK_PINS=ALL;