.NH A Toy Example. .LP In this section we present a complete example. The design consists of two .SM I/O connectors that route signals from a ribbon cable to a backplane. Here is the schematic, followed by the .CW ".w" file: .PS <toy.pic .nr dP 2 \" delta point size for program .nr dV 2p \" delta vertical for programs .P1 .so toy.w.l .P2 .LP The comments (introduced by .CW % ) are coordinates from the .CW .j file that can be used later to annotate the drawing with pin numbers. Otherwise the .CW .w file is mostly just a compendium of the text strings in the .CW .j file. In order to proceed further, we need a .CW .pins file: .P1 .so toy.pins.l .P2 .LP It should be fairly obvious what is going on here. Note the appearance of the .I "package type" on the .CW .t lines. Now the .CW .wx file can be made: .P1 .so toy.wx.l .P2 .LP This is basically a listing, for each chip, of net\ name\-pin\ number pairs. Package types are copied through from the .CW .pins file for use by the physical design tools, and the pin names are left as an aid to humans.