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Honored ContributorTimeQuest Timing Analyzer[Setup slack analysis]
HI, I am trying to understand how the Time Quest analyzer calculating required setup and hold time.I have written code for register and the clocks are common(50 MHz). As per my understanding da...
Altera_ForumHonored Contributor
Honored Contributor --- Quote Start --- As you wrote "setup slack = clock arrival time -Tsu - Setup Uncertainty". Setup uncertainty = 0.2 ns Tsu = -0.21 ns So, you get setup slack = clock arrival time -(-0.21) -0.2 = clock arrival time +0.21 -0.20 The incr colum is the slack's increment. So, it lists +0.21 and - 0.20 respectively. --- Quote End --- Here the confusion start again,i given 0.2ns as clock setup uncertainty. But why in waveform window it showing as (-0.2ns) .Why the negative sign came in waveform window for uncertainty setup value ?
