buffer driving distance

[jsathish.challenge]

Hi all,
How to find the distance a buffer can drive ?.

Suppose my buffer drive strength is 12x. and output capacitance is 10pf .and a unit net capacitance of a technology 2Ff.



regards,
sathish

 

[lostinxlation]

Look at the timing library. A timing arc has capacitance on one axis.

 

[yx.yang]

Hi all,
How to find the distance a buffer can drive ?.

Suppose my buffer drive strength is 12x. and output capacitance is 10pf .and a unit net capacitance of a technology 2Ff.



regards,
sathish

Hi, There is usually two factors you need consider.
A: Timing rule:
1): the maximal delay on that wire you can bear. Such as 10ps, 50ps, or 1ns?
B: DRC rule
1): the cap. on that wire can't exceed the maximal cap. the buffer can load.
2): the transition time must not larger than the maximal transion time of the cell that wire is driving.
For the two DRC rule values, you can find them it the stander cell lib.

 

[jsathish.challenge]

hi,
How to find the capacitance of the net of unit distance in particular technology(in um)