Why doesn't Lattice Diamond use the sdc file?

Question

I have inherited a Lattice Diamond project. Things seem to be fine, excpet for the systems constraints file. In the Lattice Diamon file list, the sdc file I have shows as greyed out.

Right clicking provides a menu with "set as active", however that option is also greyed out.

I have attempted to make a new one with the same text as the old one:

# ##############################################################################
# iCEcube SDC
# Version:            2013.12.25022
# File Generated:     Dec 2 2014 13:31:26
# ##############################################################################
####---- CreateClock list ----1
create_clock  -period 12.50 -name {CLK_IN} [get_ports {CLK_IN}] 

But the same thing happens, Lattice Diamond refuses to let me use it.

I can create an fdc file, and I get the same issue. I also need to use the sdc file due to internal pollicies.

Despite various internet and stack exchange searches, I have found nothing about this issue.

Answer 1

I found the answer! Just a few minuets of searching later!

As stated in the Lattice Diamond User Guide (August 2013), page 47:

An .sdc file or .fdc file can be added to an implementation if the selected synthesis tool is Synplify Pro or Precision. If the selected synthesis tool is the Lattice Synthesis Engine (LSE), which is available for MachXO/2 and Platform Manager devices, a Lattice design constraint (.ldc) synthesis file can be added. Constraints in the .ldc file use the Synopsys constraint format.

A quick test shows this: setting the synthesis tool to Synplify Pro lets me use the sdc file, setting it to Lattice LSE doesn't let me use the sdc file, it only accepts ldc files.