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Annotation of researchv10dc/vol2/Ucds/toy, revision 1.1.1.1

1.1       root        1: .NH
                      2: A Toy Example.
                      3: .LP
                      4: In this section we present a complete example.  The design consists of
                      5: two
                      6: .SM I/O
                      7: connectors that route signals from a ribbon cable to a backplane.
                      8: Here is the schematic, followed by the
                      9: .CW ".w"
                     10: file:
                     11: .PS <toy.pic
                     12: .nr dP 2       \" delta point size for program
                     13: .nr dV 2p      \" delta vertical for programs
                     14: .P1
                     15: .so toy.w.l
                     16: .P2
                     17: .LP
                     18: The comments (introduced by
                     19: .CW % )
                     20: are coordinates from the
                     21: .CW .j
                     22: file that can be used later to annotate the drawing with pin numbers.
                     23: Otherwise the
                     24: .CW .w
                     25: file is mostly just a compendium of the text strings in the
                     26: .CW .j
                     27: file.
                     28: In order to proceed further, we need a
                     29: .CW .pins
                     30: file:
                     31: .P1
                     32: .so toy.pins.l
                     33: .P2
                     34: .LP
                     35: It should be fairly obvious what is going on here.  Note the appearance of the
                     36: .I "package type"
                     37: on the
                     38: .CW .t
                     39: lines.
                     40: Now the
                     41: .CW .wx
                     42: file can be made:
                     43: .P1
                     44: .so toy.wx.l
                     45: .P2
                     46: .LP
                     47: This is basically a listing, for each chip, of net\ name\-pin\ number pairs.
                     48: Package types are copied through from the
                     49: .CW .pins
                     50: file for use by the physical design tools, and
                     51: the pin names are left as an aid to humans.

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