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       phseg - mbk physical segment

       The  phseg  structure is	used to	describe a segment belonging to	a sym-
       bolic 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  war-
			   ranty,  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 val-
			   ues 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 in-
			   formations on the segment.

       mbk(1), addphseg(3), getphseg(3), delphseg(3), phfig(3),	ptype(3).

ASIM/LIP6			October	1, 1997			      PHSEG(3)


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