set_treat_blockage_as

set_treat_blockage_as_metal

set_treat_blockage_as_metal 
{-layers {s_layerName…} | -get_layers {s_layerType…}} 
{[ -min_width [ true | false ] ] | [ -min_space [ true | false ] ]} 
[ -override [ true | false ] ] 
[ -eol_style [ preferred | nonpreferred | ring | orthogonal ] ] 
[ -force_min_space [ true | false ] ] 
[ -span_style [ preferred | nonpreferred | ring | orthogonal ] ]

Description

Determines the effective width and/or spacing to use for blockages on one or more layers or layer types. By default, all blockages are treated as metal and use the minimum spacing rule for blockage-to-neighbor shape spacing.

Using environment variables, you can control which blockages are loaded when you open a design. For more information on these variables, refer to Space-based Router Tcl Environment Variables.

If you load a design with the LEF property USEMINSPACING OBS ON, the blockage settings will automatically be set to min_width true, min_space false, override false, force_min_space false.

It is illegal for a blockage to have both a minimum spacing property and a minimum width property, so the -min_width and -min_space arguments are mutually exclusive.

Arguments

`-eol_style [preferred \| nonpreferred \| ring \| orthogonal]`
	Specifies how to treat blockages with an effective width for end-of-line (EOL) checking.
	`nonpreferred`	Parallel wires of effective width oriented perpendicular to the layer’s preferred direction
	`orthogonal`	Combination of preferred and nonpreferred wires
	`preferred`	Parallel wires of effective width oriented in the layer’s preferred direction
	`ring`	(Default) A single ring of effective width inward from the outer edge of the blockage
`-force_min_space [ true \| false ]`
	When `true`, the minimum spacing rule on all blockages is used for blockage-to-neighboring shape spacing. When `false`, Space-based Router and Chip Optimizer calculates and uses the larger of minimum spacing for the blockage and the neighboring shape. By default, this value is `true`.
`-get_layers [[metal][cut][poly][other][all]]`
	Processes layers of the given types. By default, all types are processed.
`-layers` {s_layerName…}
	Specifies the name of the layers to set.
`-min_space [ true \| false ]`
	Assigns all unspecified shapes to a minimum space rule. By default, this value is `false`.
`-min_width [ true \| false ]`
	Assigns all unspecified shapes to a minimum effective width. By default, this value is `false`.
`-override [ true \| false ]`
	Ignores all preassigned widths and/or spacings and determines blockage settings based on the other arguments given:
	`-min_space`	Subjects all blockages to the min space rule.
	`-min_width`	Subjects all blockages to the effective width.
	(none)	Treats all blockages as metal and uses the width to calculate spacing requirements.
	The default for this argument is `false.`
`-span_style [preferred \| nonpreferred \| ring \| orthogonal]`
	Specifies how to treat blockages with an effective width for span checking.
	`nonpreferred`	Parallel wires of effective width oriented perpendicular to the layer’s preferred direction
	`orthogonal`	Combination of preferred and nonpreferred wires
	`preferred`	(Default) Parallel wires of effective width oriented in the layer’s preferred direction
	`ring`	A single ring of effective width inward from the outer edge of the blockage

Blockage Modeling Examples for eol_style and span_style

Examples

The following table gives examples of how to interpret the argument settings.

Description	`min_width`	`min_space`	`override`	`force_min_space`
Use preset effective width properties and use minimum effective width for all blockages with no effective width properties	true	false	false	false
Use preset effective spacing properties and use minimum effective spacing for all blockages with no minimum spacing properties	false	true	false	false
Use minimum width for all blockages regardless of effective minimum width properties	true	false	true	false
Use minimum spacing for all blockages regardless of effective minimum spacing properties	false	true	true	false
Use the minimum spacing rule around blockages regardless of the rules for neighboring shapes (Default)	false	false	false	true

The following example represents the default settings, which use the minimum spacing rule around blockages, regardless of the rules of neighboring shapes.

set_treat_blockage_as_metal -layers $metal_layers -min_width false -min_space false -override false -force_min_space true

Virtuoso Space-based Router Command Reference
Product Version IC23.1, September 2023