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regarding clocks

venkatramanan
After cts how we knows all flipflop get clocks? can u any one help me
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  • This is really sort of two questions. First, are all the flops getting a clock? This can be answered before the clock tree is built. Run check_timing and look for "clock_expected" warnings. These will show places where a clock was expected but not found.

    Second, I think you're asking if after CTS, can you tell if a tree was built to each flop? That's a bit harder to answer, but you could check the log file for any problems, or check the clock pins of the flops to see if there is CTS buffering (meaning, the flop is not still connected to the clock root). Try the clock tree browser or clock tree analyst.

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  • This is really sort of two questions. First, are all the flops getting a clock? This can be answered before the clock tree is built. Run check_timing and look for "clock_expected" warnings. These will show places where a clock was expected but not found.

    Second, I think you're asking if after CTS, can you tell if a tree was built to each flop? That's a bit harder to answer, but you could check the log file for any problems, or check the clock pins of the flops to see if there is CTS buffering (meaning, the flop is not still connected to the clock root). Try the clock tree browser or clock tree analyst.

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