User Guide

Swaplevel:Pinslayerisvisible

Input pins 1 and 2 have swaplevel 1, so they can be exchanged with one

another. The output pin, 3, which has swaplevel 0, cannot be exchanged.

YoucanfindtheswaplevelofagatebymeansoftheINFOcommand.

PowerSupply

Pins defined as having the direction Pwr are automatically wired up.

This is true, even if the associated power gate has not explicitly been

fetched into the schematic. The name of the Pwr pin determines the

name of the voltage line. This is already fixed by the definition of the

symbolsinthelibrary.

If nets are connected to a device’s Pwr pins, then these pins are not

automaticallywired.Theyarejoinedinsteadtotheconnectednet.

For every Pwr-pin there must be at least one pin with the same name but

the direction Sup (a supply pin). There must be one on every sheet.

These Sup pins are fetched into the schematic in the form of power sup

ply symbols, and are defined as devices in a library (see supply.lbr).

These devices do not have a package, since they do not represent com

ponents. They are used to represent the supply voltages in the schematic

diagram, as is required by the electrical rule check (ERC) for the pur

posesofitslogicalchecks.

Various supply voltages, such as 0 V or GND, which are to have the

same potential (GND, let’s say), can be connected by adding the corre

sponding supply symbols and connecting them with a net. This net is

thengiventhenameofthatpotential(e.g.GND).

Supplysymbols

EAGLEManual