Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

Timequest output to extrernal device SDC question

I was attempting to create a SDC file to constrain my outputs but I think I do not understand the case when the FPGA drives an external device with its own clock. For the FPGA inputs I feel like I u...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

Option b) works, but it does need a big red warning.

If you use 

set_false_path -from   -to

then, it just sets cut the path between the pins from analysis and just stops TimeQuest from complaining about unconstrained paths.

But if you use 

set_false_path -from   -to

then it cuts all paths between those two clocks from analysis. Totally not what you want.