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Altera_Forum
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15 years ago

Negative slack on TimeQuest report

Hello everybody I'm getting some negative slack messages on TimeQuest Timing Analyzer. I have one input clock and one PLL with one clock output in my system. But all of these messages are r...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Hello,

the fact that the clock and the register is the same is perfectly normal if there's afeedback path for that register.

Ie, this would cause a feedback path.

always @ (posedge pll_clk)

data_sent <= data_sent && some_more_stuff;