OSUFreePDK45_cells_description.md

General considerations

As my objective is to construct a graph of a sample design, there is no need to distinguish high or low output drive strength. All that is needed is the type of cell to correctly represent the structure of the design.

Cells

All these info are extracted from the OSU website.

AND2X1 & AND2X2

Y=(A&B)

AOI21X1

Y=!((A&B)|C) "And, Or, Inverted".

More info

AOI22X1

Y=!((C&D)|(A&B))

BUFX2 & BUFX4

Y=A

CLKBUF1 & CLKBUF2 & CLKBUF3

Y=A, but for the clock.

DFFNEGX1

FLIPFLOP{
  DATA=D
  CLOCK=!CLK
  Q=DS0000
  QN=P0000
}
Q=DS0000

DFFPOSX1

FLIPFLOP{
  DATA=D
  CLOCK=CLK
  Q=DS0000
  QN=P0000
}
Q=DS0000

DFFSR

FLIPFLOP{
  DATA=D
  CLOCK=CLK
  PRESET=!S
  CLEAR=!R
  Q=P0002
  QN=P0003
}
Q=P0002

FAX1

YC=((A&B)|(B&C)|(C&A))
YS=(A^B^C)

HAX1

YS=(A^B)
YC=(A&B)

INVX1 & INVX2 & INVX4 & INVX8

Y=!A

LATCH

Latch{
  DATA=D
  CLOCK=CLK
  Q=DS0000
  QN=P0000
}
Q=DS0000

Which is the same function as DFFPOSX1, but not the same power.

MUX2X1

Y=!(S?(A:B))

NAND2X1

Y=!(A&B)

NAND3X1

Y=!(A&B&C)

NOR2X1

Y=!(A|B)

NOR3X1

Y=!(A|B|C)

OAI21X1

Y=!((A|B)&C) "Or (2), And(1), Inverted".

OAI22X1

Y=!((C|D)&(A|B))

OR2X1 & OR2X2

Y=(A|B)

TBUFX1 & TBUFX2

Y=(EN?!A:'BZ)

XNOR2X1

Y=!(A^B)

XOR2X1

Y=(A^B)