Using the Electric VLSI Design System

Chapter II: BASIC EDITING

| ## 3: Circuit Deletion |

To remove circuitry, select nodes and/or arcs and use the Erase command from the Edit menu. A keyboard shortcut for this is the Delete key. If there is a highlighted area rather than a highlighted object, everything in the area is erased.

Note that an arc cannot remain if its node is gone. Therefore, when a node is erased, all connecting arcs are also deleted. Conversely, in the interest of cleanliness, if an arc is erased, any isolated pins are also erased. Also, if an erased node has an exported port (as in the example below), then the port disappears and so do all arcs connected to the port on instances of the current facet (for more information on hierarchy, see section 3-1).

If there are exactly two arcs connected to a node and you use Erase and Reconnect on that node, then the node is deleted and a new arc is created to replace the two that were previously attached to it.

The Erase Geometry command erases all geometry in the highlighted area. All arcs that cross into that area will be truncated. Thus, this command truly erases geometry, independent of the structure of nodes and arcs. If you leave one of these size fields empty, that coordinate is not changed. |

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