check_min_edge_length

check_min_edge_length 
-lpp {s_layerlpp…} 
[ -output_lpp s_layerlpp ]
[ -region {f_xlo f_ylo f_xhi f_yhi} ] 
[ -annotate [ true | false ] ] 
[ -annotation_limit i_count ]
[ -clear_annotations ]
[ -error_limit i_count ]
[ -no_sync ] 
[ -silent|-verbose ] 
[ -top_level_only ] 
[ -trim_corners ] 
[ -threads i_threads ] 

Description

Checks shapes for Optical Pattern Correction (OPC) suitability by determining whether each shape meets the following constraints: minEdgeAdjacentDistance, minEdgeLength, minEdgeMaxCount, and oaMinEdgeAdjacentLength. Only constraints that have been set will be checked.

The GUI equivalent for this command is Verify—Shapes.

Arguments

-annotate [ true | false ]
	Chooses whether to mark violations with annotations. The annotations are added to the annotation:violation purpose of the given layers and are listed by layer under Minimum Edge Length Check in the Violations page of the Annotation Browser. By default, annotations are created.
-annotation_limit i_count
	Specifies the maximum number of violations to create annotations for. By default, annotations are created for up to 1000 violations. Specify -annotation_limit -1 to choose no limit.
-clear_annotations	Removes existing violation annotations of the same check type and input layers before performing this check. If not specified, existing violations are not cleared.
-error_limit i_count	Specifies the maximum number of errors to detect before stopping. By default, no error limit is set. A value of -1 also specifies no limit.
-lpp {s_layerlpp…}	Specifies the list of layers and/or layer purpose pairs to check.
-no_sync	Prevents the OpenAccess database from being updated.
-output_lpp s_layerlpp
	Specifies the layer purpose to add the checking results to. Shapes that fail to meet the minimum edge length requirements are added.
-region {f_xlo f_ylo f_xhi f_yhi}
	Specifies the boundary points for the area to check. If not specified, the entire design in the active artwork window is checked.
-silent	When selected, turns off all messages during the check.
-threads i_threads	Specifies the number of threads or processors to use in parallel to run this command. By default, if multi-threading has been enabled, the session threads are used, otherwise, one processor is used.
-top_level_only	Specifies that top-level shapes and shapes connected to top-level shapes be checked. By default, all shapes are checked.
-trim_corners	Specifies that corners be trimmed for checking.
-verbose	Outputs a message for each error found during the check.

Value Returned

i_count	Indicates the number of shapes that violate the rule for the given criteria.
-1	The command did not run due to a syntax error or a missing required argument.

Examples

The following figure is used for the examples in this section.

Case 1—Using minEdgeMaxCount

set_constraint_parameter -name maxLength -Value 0.4
set_layer_constraint -layer M2 -constraint minEdgeMaxCount -IntValue 2
check_min_edge_length -lpp M2 -clear_annotations

Flags any sequence of more than two segments that are less than 0.4 in length. For example, if segments B, C, E, F, G and H are all less than 0.4 in length, then B and C are not violating since there are only two consecutive short segments. However, E-G and F-H are in violation because there are more than two consecutive short segments.

Case 2—Using minEdgeAdjacentDistance

set_constraint_parameter -name length -Value 0.4
set_constraint_parameter -name count -IntValue 2
set_layer_constraint -layer M2 -constraint minEdgeAdjacentDistance -Value 1.0
check_min_edge_length -lpp M2 -clear_annotations

Flags a violation if the length of segment D is less than 1.0 and at least segments B, C, E, and F are all less than 0.4 in length. For this example, the rule is triggered when there are two sets of edges, each with at least two (count) consecutive edges that are less than or equal to length in length.

Case 3—Using minEdgeLength

set_layer_constraint -layer M2 -constraint minEdgeLength -Value 0.4
check_min_edge_length -lpp M2 -clear_annotations

Flags an error if any edge is less than 0.4 in length.

Case 4—Using minEdgeLength with lengthsum parameter

set_constraint_parameter -name lengthSum -Value 1.0
set_layer_constraint -layer M2 -constraint minEdgeLength -Value 0.4
check_min_edge_length -lpp M2 -clear_annotations

Flags the same violations as case 3. However, if the sum of the consecutive segments that are less the 0.4 in length is less than 1.0, then there is no violation.

Case 5—Using oaMinEdgeAdjacentLength

set_constraint_parameter -name maxLength -Value 0.4
set_layer_constraint -layer M2 -constraint oaMinEdgeAdjacentLength -Value 1.0
check_min_edge_length -lpp M2 -clear_annotations

Flags a violation if any minimum length edge (length less than or equal to 0.4) is adjacent to an edge that is less than 1.0 in length. In the example, all shorter edges would be in violations.

Related Topics

Verify Commands

enable_multithreading

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