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- Pins should all be 300 mils (3 grid spaces) long.
- Pins should be color number 1 (pins | white).
- Leave 400 mils (4 grid spaces) between (vertically) pins, unless
you are drawing a special symbol, then just try to make it look
good.
- Pin number attributes should be 50 mils above (or below; which
ever makes the most sense) the pin which they are attached to.
- Input pins belong on the left and output pins belong on the right of
the symbol.
- Please do not mix inputs and outputs on the same side of the symbol,
unless absolutely necessary.
- You can have pins on the top or bottom of a symbol.
- The order for rows of pins (buses) should be LSB (least significant
bit) to MSB (most significant bit). When drawing pins which
are part of a bus, make sure the LSB of the bus is at the top
(or for pins on top/bottom of a symbol, left of the rest of
the other pins). Look at 74/74181-1.sym for a correct example
of this order (A0 on top through A3 and B0 on top through B3).
Violating this rule will make connecting buses much more difficult.
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Ales V. Hvezda
2003-09-01