[SOLVED] standard cells-LEF files

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ramesh28

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Hello all,

in my design database of pnr..i obeserved that there are various types of D f/f (standard cell)..such as DFF_X1, DFFS_X1, DFFR_X1, DFFRS_X1, SDFF_X1, SDFFS_X1, SDFFR_X1, SDFFRS_X1

Can anyone explain me what all these name suggest about?

Thank you..
 

Usually, the cell with R is resettable, with S is settable, and RS is setable and resettable. No R or S is w/o set and reset pins.
 

lostinxlation said:
Usually, the cell with R is resettable, with S is settable, and RS is setable and resettable. No R or S is w/o set and reset pins.
Click to expand...

Thanx for reply..

I got this in case of DFF_X1, DFFS_X1, DFFR_X1, DFFRS_X1 these cell. But if you see in case of SDFF_X1, SDFFS_X1, SDFFR_X1, SDFFRS_X1, these cell contains one more S..what that represent?
 

S scannable flop, means SI/SE pins added.
_X[value]: is the drive of this std cell.
 

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