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Why Hold time is not considered while calculating Max. Clk Freq.?

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pkgupta_work

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Hi friends,

Why Hold time is not considered while calculating Max. Clk Freq.?
 

Clk Freq

In the sequencial circuit, output of flip flops going through cominatinal logic then, again, to flip flops inputs.
Thus delay would be combinational delay+setup time of flipflop.
hold time would be satisfied inherently.
 

Clk Freq

because hold time requirement does not depend on clock period !!

hence not used
Shiv
 

Clk Freq

I think more complete statement would be "hold time of single cycle paths doesnot depend on clock period"
For multicycle paths, depending on logic implementation, it can depend on clock period.
 

Clk Freq

for multicycle path, hold is calculated at one clock before setup edge
 

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