DESCRIPTION

The phseg structure is used to describe a segment belonging to a symbolic layout model, see phfig(3) for details. Transistors are segments of a particular layer.

The declarations needed to work on phseg are available in the header file "/labo/include/mph402.h", where '402' is the actual mbk version.

The following C structure supports the description of the segment :

typedef struct phseg {
   struct phseg     *NEXT;
   char             *NAME;
   long             X1,Y1,X2,Y2;
   long             WIDTH;
   char             TYPE;
   char             LAYER;
   struct ptype     *USER;
} phseg_list;

NEXT

Pointer to the next segment in the list.

NAME

Name of the segment. The name is not an identifier, and a name is present only if the designer used one for debug purposes.

X1, Y1, X2, Y2

Coordinates of each end of the segment. Since it's a symbolic segment, one alway has either X1 = X2 or Y1 = Y2. Furthermore, by construction, it is warranty, if one accesses the data structure through the legal functions, that X1 <= X2 and Y1 <= Y2.

TYPE

This caracter can take four values :

LEFT or RIGHT

if Y1 = Y2. The exact value is chosen by addphseg, depending upon X1 and X2 relations.

UP or DOWN

if X1 = X2

LAYER

Symbolic layer used for the segment. The legal values are :

NWELL

N bulk

PWELL

P bulk

NTIE

N implant in P bulk

PTIE

P implant in N bulk

NDIF

N diffusion

PDIF

P diffusion

NTRANS

N transistor

PTRANS

P transistor

POLY

polysilicium

ALU1

first metal

ALU2

second metal

ALU3

third metal

TPOLY

polysilicum through route

TALU1

first metal through route

TALU2

second metal through route

TALU3

third metal through route

WIDTH

Width of the segment. The physical extension of a segment is perpendicular to its direction.

USER

Pointer to a ptype list, see ptype for details, that is a general purpose pointer used to share informations on the segment.