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Hi GPK - thanks for you answer. What is still puzzling me is the meaning of the constraint:
set_output_delay -clock EXT_CLK 0 [get_ports {EXT_CLK}]
If I understand what set_output_delay is supposed to do, I would think this means:
"EXT_CLK will take a while to get to my external device so we better delay EXT_CLK by that much to make sure EXT_CLK is correctly latched at the external device by EXT_CLK"
This sounds like nonsense to me. What am I missing?
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Hi,
a good explanation could be found in the Application Note AN433 helps:
http://www.altera.com/literature/an/an433.pdf?gsa_pos=1&wt.oss_r=1&wt.oss=an433 Kind regards
GPK
Honored Contributor
