congested [number]
The congested command generates and returns a list of cell instances, in order of predicted congestion, from most congested to least congested. Each entry in the list is itself a list of two entries. The first entry is the instance name, and the second is the estimated level of congestion. The congestion prediction calculation is the same as used for the "map estimate" command, although "map estimate" normalizes the congestion to the color range of the map, whereas the "congested" command returns a non-normalized value. The value is a single value, averaged over the entire area of the cell instance.The intended purpose of the "congested" command is to provide feedback to a placement tool in the event that qrouter is unable to route a layout due to over-congestion of the layout.
congested is implemented as a built-in command in qrouter, only in the Tcl version.
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Last updated: November 22, 2013 at 12:07pm