Latch Based Designs

Latch Based Clocking

• Every cycle is broken by two latches
   – That means that each signal must go through two latches
   – So if you set clocks up correctly, hold time should not be bad
      • Problem is each latch has a different clock, so skew can cause
hold time issues
• But in this system there are no hard edges
   – Transparency window of each latch is large, ½ a clock cycle
• The large transparency window means
   – Can borrow time naturally
      • Can have up to 1.5 cycle (if there was no skew) in some cycle, if the adjacent cycle only needs .5 w/o skewing clocks
   – Is insensitive to clock skew; for critical paths, data sets timing

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