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what is cell delay?and cell delay depends upon what paramets

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vamsi_addagada

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net delay and cell delay

what is cell delay?and cell delay depends upon what parameters
 

Re: what is cell delay?and cell delay depends upon what para

cell delay - Any logic cell is a combination of RC networks. A signal passing through a RC network will get delayed. Cell delay is a function of output loading and input slew rate
 
As mentioned above ...

the cell delay depends on
1) input transition ( input slew rate)
2) output load

the cell delay is the min delay after which the output changes its state accg to the input !!
 
charing and discharging time of capacitor or load :) ..
rc time constant.

is it applicable to all cells? ( think about it )
 
Re: what is cell delay?and cell delay depends upon what para

i think cell delay is due to the switching of the transistors in the cell. how does the loading of the cell determine the cell delay. Could anyone answer the query.

thank you.
 

Re: what is cell delay?and cell delay depends upon what para

Hi,

As per i know

Total delay or path delay = Cell delay + Net delay

“Net Delay” refers to the total time needed to charge or discharge all the
parasitics of a given net

Total net parasitics are affected by

net length
net fanout
more...

Cell delay

The delay of a cell is affected by:

The input transition time (or slew rate)
The total load “seen” by the output transistors
Net capacitance and “downstream” pin capacitances
These will affect how quickly the input and output
transistors can “switch”.

Hope it helps.
 

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