Timing borrowing definition

[ruanwang]

Hi guys,

I'm so confuse about "borrowing timing". So, cuold you explain simplest about it for me?
It's better if you have related acrticle about it.
BR.

 

[praneethrajkanakam]

Hi guys,

I'm so confuse about "borrowing timing". So, cuold you explain simplest about it for me?
It's better if you have related acrticle about it.
BR.

Time Borrowing




Time borrowing is borrowing of time from a path with lesser delay to a path with greater delay. It is possible with latch based design as a latch is level triggered device unlike flip flops which are edge triggered.

For eg... say the clock period is 10 ns..
CL- Combinational Logic

CL 1 - takes 12 ns to compute the data;
CL2 - takes 5 ns to compute the data;

If we use latch ; we can share the extra 2 ns of CL 1 to CL 2; as the latch (negative enabled) is active for the entire positive phase of the clock signal.