7262 - Radiant and Diamond: HDL pin constraints not seen in Spreadsheet View/Device Constraint Editor

7262 - Radiant and Diamond: HDL pin constraints not seen in Spreadsheet View/Device Constraint Editor

Description:

In Lattice Radiant and Diamond, while using the Spreadsheet View/Device Constraint Editor, it is possible to not see the HDL pin constraints reflected in GUI.

Solution:

This may be because the pins mentioned in the lines of code have been optimized by the tool.

See the following warnings:

 

If the user wants these to appear in Spreadsheet View or Device Constraint Editor, they will need to use the syn_keep attribute to avoid the optimization. Here is an example on CPLD_JTAGEN:

output    CPLD_JTAGEN       /* synthesis LOC = "C13"*/   /* synthesis syn_keep = 1*/  ,