check_antenna
check_antenna
-all | -net netName | -set d_setObj
[ -error_set d_setObj ]
[ -exclude_nets {s_netName …} ]
[ -annotate [ true | false ] ]
[ -check {[PAR] [CAR]} ]
[ -clear_annotations ]
[ -detailed ]
[ -diff_use_only [ {s_layerName…} ] ]
[ -file [s_fileName ] ]
[ -model {[OXIDE1] [OXIDE2] [OXIDE3] [OXIDE4]} ]
[ -noIOPinDefault [ true | false ] ]
[ -use_factors [ true | false ] ]
[ -short_format [ true | false ] ]
[ -silent [ true | false ] ]
[ -vioLimit i_count ]
Description
Checks for process antenna violations for the entire design, a specific net, or nets in a set. You can choose to ignore specific nets or add violating nets to a set. Results are output to the Transcript area or to a file.
To use this command, your design data must have been imported from LEF and DEF files that include process antenna keywords for setting values used by this check.
Arguments
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-all
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Performs process antenna checks on all nets.
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-annotate [ true | false ]
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Creates annotations for violations.
The annotations are added to the annotation:violation purpose for the metal layer and are listed by model and net as Process Antenna Violations in the Violations page of the Annotation Browser.
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-check {[PAR][CAR]}
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Determines which checks to perform: PAR (Partial Area Ratio), CAR (Cumulative Area Ratio).
Default: PAR and CAR, whichever ratios are defined in the LEF file
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-clear_annotations
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Removes existing violation annotations of the same check type before performing this check. If not specified, existing violations are not cleared.
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-detailed
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Includes non-violating nets in the report. By default, only nets with violations are reported.
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-diff_use_only [{s_layerName…}]
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Specifies layers to apply area factor to when connected to diffusion. If no layer is given, then area factor applies to all layers when connected to diffusion.
Default: Area factor is not applied to any layer.
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-error_set d_setObj
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Adds violating nets to this set.
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-exclude_nets {s_netName …}
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Ignores the given nets from the check. This argument is ignored if -net is specified.
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-file [s_fileName ]
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Outputs the report to the given file. If you do not specify a filename, the report is output to antennayymmdd.hhmmss.log.
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-model
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Specifies which oxide models to use: OXIDE1, OXIDE2, OXIDE3, OXIDE4.
Default: OXIDE1
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-net s_netName
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Performs process antenna checks on the given net.
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-noIOPinDefault [ true | false ]
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Prevents the antenna checker from using IO pin default values:
-
ANTENNAINPUTGATEAREA -
ANTENNAOUTPUTDIFFAREA -
ANTENNAINOUTDIFFAREA
By default, these values are used for any input that does not have a gate area or any output that does not have diode area.
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-set d_setObj
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Performs process antenna checks on nets in the given set.
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-short_format [ true | false ]
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Reports only error nodes. By default, all terminals for each instance are reported.
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-silent [ true | false ]
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When set to true, prevents messages from being output.
Default: true
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-use_factors
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Uses area factors when computing PAR values.
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-vioLimit i_count
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Specifies the maximum number of violations to report. Default is 1000.
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Value Returned
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i_netcount
i_violationcount
i_pincount
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Tcl list with the number of violating nets, violations, and violated pins found (refer to Processing Tcl Lists).
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-1
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The command did not run due to a syntax error or a missing required argument.
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Examples
The following example performs PAR checks on myNet and reports violations to the checkmyNet file.
check_antenna -net myNet -file checkmyNet -check PAR
Related Topics
Verify Commands
fix_antenna
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