lotrs - mbk logical transistor
The lotrs is used to describe a logical transistor. It is
mostly used to describe leaf cells in terms of transistors interconnections,
and as a result of layout extractions. Since the only target technology is
CMOS, only NMOS and PMOS transistors are used.
The declarations needed to work on lotrs are available in
the header file "/labo/include/mlo.h".
The following C structure supports the description of the logical
transistor :
typedef struct lotrs {
struct lotrs ∗NEXT;
struct locon ∗DRAIN;
struct locon ∗GRID;
struct locon ∗SOURCE;
struct locon ∗BULK;
char ∗TRNAME;
long X,Y;
unsigned short WIDTH, LENGTH;
unsigned short PS, PD;
unsigned short XS, XD;
char TYPE;
struct ptype ∗USER;
} lotrs_list;
- NEXT
- Pointer to the next lotrs of the list.
- DRAIN
- Pointer to the drain connector of the transistor. This connector is, of
course unique. See locon(3) for details.
- GRID
- Pointer to the grid connector of the transistor. This connector is, of
course unique. See locon(3) for details.
- SOURCE
- Pointer to the source connector of the transistor. This connector is, of
course unique. See locon(3) for details.
- BULK
- Pointer to the bulk connector of the transistor. This connector is, of
course unique. See locon(3) for details.
- TRNAME
- Transistor instance name
- X, Y
- Coordinates of the transistor in a layout. These informations have sens
only if the transistor netlist is the result of a layout extraction. They
are otherwise set to zero. These coordinates are given in micron times the
scale factor SCALE_X, since the extracted view is technology
dependant.
- WIDTH,
LENGTH
- Respectivly width and length of the transistor grid.
- PS, PD
- Respectivly perimeter of the source and drain, in micron times the scale
factor SCALE_X.
- XS, XD
- These values are needed to compute respectivly the source and drain areas.
Let As be the source area in square microns, and Width be
the transistor grid width in micron, then lotrs->XS = As / Width *
SCALE_X
- TYPE
- Canal type of the transistor. Six legal values are available :
- USER
- Pointer to a ptype list, see ptype(3) for details, that is a
general purpose pointer used to share informations on the transistor.
- In integrated techniques, NMOS transistor bulk for digital circuits is
always set to ground, and PMOS transistor bulk for digital circuits is
always set to positive supply.