PHSEG(3)						MBK PHYSICAL STRUCTURE DEFINITIONS						  PHSEG(3)

NAME

       phseg - mbk physical segment

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  pur-
			   poses.

       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. Fur-
			   thermore, 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.

SEE ALSO

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

BUG REPORT

       This tool is under development at the ASIM department of the LIP6 laboratory.
       We need your feedback to improve documentation and tools.

ASIM
/LIP6							  October 1, 1997							  PHSEG(3)