Forum Discussion

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

Constraining global signals

I seem to be having difficulty constraining signals as globals. I have a user I/O pin that I am using as a low speed clock to a bank of registered I/OB's ("fast input registers"). So far so goo...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

Have tried :

set_instance_assignment -name GLOBAL_SIGNAL ON -to ACH2B_CNTL[12]

with no luck.

also tried

set_instance_assignment -name USE_CLK_FOR_VIRTUAL_PIN ACH2B_CNTL[12] -to ACH2B_CNTL[12]

and

set_instance_assignment -name CLOCK_SETTINGS ACH2B_CNTL[12] -to ACH2B_CNTL[12]