minChamferLength

spacingTables(
( minChamferLength tx_layer
 (( "length" nil nil ) 
  ['convex | 'concave]
 )
 g_table
)

) ;spacingTables

Specifies required length of chamfer, indexed by adjacent edge lengths.

In some advanced node processes, 90-degree corners are not allowed on last layer metal. This constraint models this rule.

The figure below illustrates chamfer and adjacent edge lengths are calculated for convex and concave corners.

The figure below illustrates how chamfer and adjacent edge lengths are calculated for shapes with more than one chamfer.

Values

tx_layer	The layer on which the constraint is applied. Type: String (layer and purpose names) or Integer (layer number)
"length" nil nil
	This identifies the index for table.
g_table	The format of the table row is as follows: (f_adjLength f_length) where, f_adjLength is the adjacent edge length. f_length is the required chamfer length. Type: A 1-D table specifying floating point length values

Parameters

'convex | 'concave

The corner type to which the constraint applies.

Examples

• Example 1: minChamferLength with one corner
• Example 2: minChamferLength with multiple corners

Example 1: minChamferLength with one corner

The chamfer length for concave and convex corners must be at least:

• 3.0 when adjacent edge length is 5
• 4.0 when adjacent edge length is 10
• 5.0 when adjacent edge length is 15
  
  
  

Example 2: minChamferLength with multiple corners

The chamfer length for concave and convex corners must be at least:

• 1.0 when adjacent edge length is 5
• 2.0 when adjacent edge length is 10
• 3.0 when adjacent edge length is 15
• 4.0 when adjacent edge length is 35
  
  

Return to top