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geda:gschem_ug:pins_nets_buses [2012/01/13 18:11]
vzh Fixed menu item name
geda:gschem_ug:pins_nets_buses [2014/04/24 01:41]
vzh <key> formatting
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 +| << [[Components]] ​ |  **[[geda:​gschem_ug|gEDA gschem User Guide]]** ​ |  [[Graphics]] >> |
 +
 +===== Pins, nets and buses =====
 +
 +Connectivity in gEDA schematics and symbols is shown using pins, nets and buses.
 +
 +  * Pins are used in symbols, and represent either a physical pin on an electronic component, or a logical connection to a subcircuit schematic.
 +  * Nets are used in schematics. ​ They represent individual wires, and are used to connect together the pins of [[components]].
 +  * Buses are also used in schematics, and represent "​bundles"​ of multiple nets.
 +
 +Nets, pins and buses can have [[attributes]] attached to them to control how they are interpreted by [[geda:​gnetlist_ug|gnetlist]].
 +==== Adding and editing pins ====
 +
 +Pins have a //​connectible end//, which is highlighted with a colored swatch, and a static end.  Nets can only be connected at the highlighted end.
 +
 +<note tip>If you are designing a symbol, see also the [[geda:​gschem_symbol_creation|Symbol Creation Guide]].</​note>​
 +
 +To begin adding pins, use **Add→Pin**. ​ Left-click once to position the connectible end of the new pin, and left-click again for the other end.  To finish placing pins, right-click.
 +
 +If you [[selecting|select]] a pin, handles will appear for each of its endpoints. ​ You can left-click and drag these with the mouse to change the position of the pin's endpoints.
 +
 +==== Adding and editing nets ====
 +
 +Nets are made up of straight //net segments//, and net connections are formed either where two net segment ends meet, or where a net segment end meets a net segment midpoint. ​ If two net segments cross, they do not form a connection. ​ A net connection is marked by a circular cue, and a disconnected (or "​floating"​) net end with a square cue.
 +
 +To add a net segment, use **Add→Net**. ​ There are two modes for adding nets: normal mode, and magnetic mode (the default). ​ To switch between them, use **Options→Toggle Magnetic Net**.
 +
 +  * In //magnetic mode//, new nets snap onto nearby connectible points on pins and nets.  The target location that the next net point will snap to is highlighted with a circle.
 +  * In //normal mode//, new nets snap to the grid like other newly-created objects.
 +
 +Nets will be added using only combinations of horizontal and vertical segments, unless you hold down the <​key>​Ctrl</​key>​ key, in which case segments at any angle will be used.
 +
 +Selected nets can be modified by dragging the handles on their endpoints in the same way as pins.
 +
 +==== Adding and editing buses ====
 +
 +<note important>​Since buses are not currently fully supported by [[geda:​gnetlist_ug|gnetlist]],​ buses are commonly used only for documentation purposes.</​note>​
 +
 +Like nets, buses are made up of //bus segments//, follow similar connectivity rules, and can be edited in the same way.
 +
 +To add buses, use **Add→Bus**. ​ When adding buses, each new bus segment is constrained to be either horizontal or vertical, unless you hold down the <​key>​Ctrl</​key>​ key.  Buses do not support magnetic mode.
 +
 +When you connect a net to a bus, a "bus ripper"​ symbol is automatically inserted. This allows two nets to be attached to the same point on a bus from opposite sides without shorting together.
  
geda/gschem_ug/pins_nets_buses.txt · Last modified: 2014/04/24 01:41 by vzh