Abt clkbuffers and clkinvs

[sunilbezawada]

HI all,
Can anyone help on clkbuffers, clkinverter? In a design ? which is one best CLKBUF or CLKINV interms of timing, leakage power and noise? Can i use clkinvs in place of clkbuffers? placing clkinvs where we have 2 clkbuffers. So if i am using in this method can i reduce nof levels of clktree? what about noise margin if i am using clk invs?

 

[rsqf]

These issues are considered in the ClockTreeSynthesis phase. Are you in this phase?

 

[sunilbezawada]

yes, I am in clk tree phase. Can you help me out.

 

[rsqf]

In my opinion, if you use invclk instead of bufclk, the clock tree will be so long because of the fanout of clock. So the tool will decide place where use inv or buff.

 

[sunilbezawada]

ya. I agree with you. I am talking in case if i am going with a manual CTS. Where i can implement with clkinv wit good drivers compare to buffers. So apart delay varies in this case of clkbuf and clkinv?

 

[rsqf]

In my opinion, you can use invclk instead of the bufclk in the palce where the transition time does not have much margin.