20 March 2015

Basic Terminology 3

Recovery and Removal Time

 

Recovery time:

  • Recovery specifies the minimum time that an asynchronous control input must be held stable after being de-asserted and before the next clock transition.
  • It is minimum length of time an asynchronous control signal must be stable before next active clock edge.
The recovery slack time calculation is similar to clock setup slack time calculation but it applies asynchronous control signals.

Recovery slack time = Data required time - Data arrival time

Where Data arrival time= launch edge + clock network delay to source reg. + Tclk +Tcombinational
            Data required time= launch edge + clock network delay to destination reg. + Tsetup

Removal time:

  • Removal specifies the minimum time that an asynchronous control input must be held stable before being de-asserted and often previous clock (active-edge) transition.
  • It is minimum length of time an asynchronous control signal must be stable after active clock edge.
The removal slack time calculation is similar to clock hold slack time calculation but it applies asynchronous control signals.

Removal slack time = Data arrival time - Data required time

Where Data arrival time= launch edge + clock network delay to source reg. + Tclk of source reg. +                                               reg. to reg. delay
            Data required time= launch edge + clock network delay to destination reg. + Thold


6 comments:

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