create_chamfer_fill
create_chamfer_fill
[ -all | -region {f_xlo f_ylo f_xhi f_yhi} ]
[ -set d_setObj ]
[ -layer {s_layerName…} ]
[ -chamfer_filter {s_filter…} ]
[ -length_threshold f_threshold ]
[ -chamfer_value1 {f_chamfer1 | { f_inner1 f_outer1}} ]
[ -chamfer_value2 {f_chamfer2 | { f_inner2 f_outer2}} ]
[ -extend_via_chamfer [ true | false ] ]
[ -allow_violation [ true | false ] ]
[ -output_purpose s_purposeName ]
[ -material_removal_purpose s_purposeName ]
[ -useEdgeLength [ true | false ] ]
Description
Creates chamfer fill on wires (pathSegs). The chamfer fill mechanism removes 90-degree corners by filling the corners of wires that form T-junctions, L-shaped wires, wire-to-via, wire-to-rectangle, and wire-to-polygon connections. T-junctions and L shapes created using only rectangles or polygons are not considered for chamfer fill.
An example of a chamfer fill shape on an L-shaped wire is shown in the following figure.
An example of chamfer fill for a wire that connects to a pin (rectangle) is shown in the following figure.
The following figure shows examples of chamfer fill shapes added at the intersections of wires and rectangles or polygons.
If the chamfer fill added by this command causes a minEdgeMaxCount violation, the chamfer fill edges are extended to fix the violation, as shown in the following figure.
Arguments
|
Creates chamfer fill on all the wires of the design. This is the default. |
|
|
When |
|
|
Filters the wires on which chamfer fill is created based on specified criteria. For example:
|
|
|
Specifies the chamfer value to be applied if |
|
|
Specifies the chamfer value to be applied if |
|
|
When
(Default) When |
|
|
Creates chamfer fill only on the layers specified in the list. By default, all the routing layers are included. |
|
|
Specifies the threshold value that determines whether
If |
|
|
Adds a chamfer shape on the specified purpose to be processed during stream out or fracturing to remove the 90-degree corner of an L-shaped wire. |
|
|
Specifies the purpose for the added chamfer fill shapes. The default is |
|
|
Creates chamfer fill only on the wires in the specified region. By default, the entire design is processed. |
|
|
Computes the length on the external edges of the wire. The default is |
|
Examples
Example 1—Chamfer fill situation where length_threshold is not considered
create_chamfer_fill -all -length_threshold 0.0 -chamfer_value1 2.0 -chamfer_value2 2.0
Creates chamfer fill of 2 microns on all routing layers for all 90-degree corners at T-junctions, L-shaped wires, and wire-to-via connections. When applied to the example in the following figure, chamfer fill of 2 microns is created on both sides of the T-junction.
Example 2—Chamfer fill situation where length_threshold is considered
create_chamfer_fill -all -layer M2 -length_threshold 5.0 -chamfer_value1 1.5 -chamfer_value2 2.0
Creates chamfer fill on the M2 layer according to the following conditions:
- If one of the two segments is less than 5.0 microns in length, then the chamfer fill will be 1.5 microns.
- If both segments are greater than or equal to 5.0 microns in length, then the chamfer fill will be 2.0 microns.
The following figure illustrates this with a T-junction. The left corner has segments of 3.0 and 8.0 microns in length, so its chamfer fill is 1.5 microns. Both segments (5.50 and 8.0 microns) for the right corner are greater than or equal to the length_threshold of 5.0 microns, so its chamfer is 2 microns.
Example 3—Using material_removal_purpose to chamfer the external corner of an L-shaped wire
create_chamfer_fill -all -layer M2 -material_removal_purpose "noDrawing"
Removes the 90-degree corners by adding chamfer fill on the M2 layer at T-junctions, L-shaped wires, and wire-to-via connections. In addition, chamfer fill on the noDrawing purpose is added to overlap the 90-degree corners of L-shaped wires as shown in the following figure.
Related Topics
Return to top