frequency dependancy

between set-up time and hold-time which is frequency depenend?and why?(I mean frequency of the i/p)

Asked By: jay_bits
On: Apr 12, 2005 7:29:08 AM

Comments(6)

Setup is frequency dependent. If you slow down your clock (increase clk period) then you are giving more time for the signal to settle before the current clock edge. However for hold time, if the signal is changing after the current clock edge it would continue to do so in the same time even if you increase or decrease the period. Hence hold time depends on the path delay leading up to the flop where the violation occurs and not the clock.

Comment By: kumarsg
On: Apr 28, 2010 7:02:25 AM

Setup time is the minimum time constrain. So It is a frequency dependant parameter.

Comment By: abhy4us
On: Apr 23, 2005 3:59:59 AM

hi firmy.. i think ur logic is correct...that should be the correct answer

Comment By: jay_bits
On: Apr 18, 2005 1:37:22 AM

then the frequency would be that of the clock and not of the i/p. see jay, hold time is the time the i/p shd be stable after the clock edge(active one) and by all means the stability of the ip is related to the freq of ip.

Comment By: venkateshr
On: Apr 15, 2005 6:44:59 AM

this question was recently asked in one interview..i gave the same answer saying that both r frequency dependent... but they told that holdtime is not dependent on frequency

Comment By: jay_bits
On: Apr 14, 2005 4:23:19 AM

both.

Comment By: venkateshr
On: Apr 13, 2005 7:51:44 AM

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