What is the concept of clock reconvergency pessimism removal?

[mujju433]

Can anyone explain me wt is the concept of clock reconvergency pessimism removal??
Explain it in detail... Plz

 

[mohdfayez]

crpr clock

common clock path in a design leads to CRPR. if this occurs this adds to the skew in the design hence it needs to be removed. CRPR is a feature which can remove any common clock paths occuring in a design. this feature can be used during CTS stage.

 

[rkadarla]

clock convergence pessimism removal

arey mujtaba kaisa hai

hey CRPR is Clock Re-convergence Pessimism removal, its computing delay adjustments on the clk network ,as the name says its the removal of pessimism for the clock path .

when you set the timing analysis for BC- WC mode , the same clock path is subjected to both fast op-cond and the slow op-cond,which introduces pessimism .

A setup check at a flip-flop in a circuit ensures that the latest arriving signal at the data pin arrives before the earliest arriving signal on the clock pin. Similarly, a hold check ensures that the earliest arriving data signal arrives after the latest arriving clock signal. The earliest or latest arriving signal on the data pin of a flip-flop is usually triggered by another flip-flop.

If both the clock and the data signals share a portion of the clock network , then for common clock network , a pessimism ( maximum delay - minimum delay ) will be introduced , we need to remove the same ,also if clk source insertion delays are defined they do count.

 

[mujju433]

crpr pessimis

So wt does it mean....
So it means that two paths have same sqew?
what is same


two paths have same delay ?/ does it mean that?

 

[renwl]

crpr in static timing analysis

If we design an analog circuit with clock network.

how can we do the CRPR check?