[moved] CLKBUF and INBUF actel FPGA

[incisive29]

When and how to use CLKBUF and INBUF in actel FPGA?
When I use CLKBUF in my program, it gives error. I replace it with INBUF, it works fine. What I read in an application note was CLKBUF is used when a clock needs to be be mapped to multiple modules,that is high fan out. whereas INBUF has only one fanout and can be used inputs to a single module. is that true. please help.

 

[ads-ee]

most likely an INBUF would feed a CLKBUF. You probably just connected an input pin to the CLKBUF (that is instantiated in your design).

Maybe you should take the newbie approach to FPGA design and do not instantiate primitives in your design and let the synthesis tool figure out what primitive to use.

 

[incisive29]

Thankyou for your reply. When I remove inbuf, the design synchs out. I think I should stick with my current macros.