Complex Clocking Situations Using PrimeTime

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Complex Clocking Situations Using PrimeTime Paul Zimmer Cisco Systems 1450 North McDowell Blvd. Petaluma, CA 94954-6515. Introduction Years ago, before I starting working on telecommunications chips, I used to advise other designers, Never use the falling edge of the clock, never use divided clocks, and never mux clocks except for scan . This is still sound advice most of these techniques should be avoided if possible. But in the telecommunications world, you just can't avoid doing these things. In the 3 years I've spent in the telco world, I have done static timing on 5 chips, and they all had multiple edge usage, muxed clocks and divided clocks.

SNUG San Jose 2001 3 Complex Clocking Situations Using PrimeTime Read in the netlist, and do the following sequence of commands: create_clock -period 10.0 [get_ports bpclk]

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