abutStretchMat Property

abutStretchMat list drainStretch t_material_name
abutMinExt f_value
abutRule1Ext f_value
abutRule2Ext f_value
abutContactExt f_value

Description

Stretches material towards or away from a gate when an instance is altered for abutment.

The default value of the stretch parameter must be the distance from the edge of the material to the edge of the gate. Numeric values are in user units.

• drainStretch is the name of the stretchable material parameter. You name this parameter yourself to identify the material to be stretched.
• abutMinExt is the rule for minimum diffusion overhang from the edge of the poly gate. The argument to this element is the rule value.
• abutRule1Ext is the poly-layer-to-poly-layer rule. This rule is used when the net connecting the two instances does not share the net with any other pin.
• abutRule2Ext is the poly-layer-to-diffusion-layer rule. This rule is used when the transistor width is different for the two instances being abutted.
  
  The Virtuoso custom digital placer does not take the abutRule2Ext into consideration, resulting in illegal overlap markers.
• abutContactExt is the diffusion extension value used when one of the contacts needs to be added during the abutment process. With the contacts off by default, the abutment program needs to know how close to move the selected cell to abut properly.

Example

abutStretchMat list("drainStretch" ilList
     list("abutMinExt" 0.5)
     list("abutRule1Ext" 0.75)
     list("abutRule2Ext" 1.0)
     list("abutContactExt" 3.0)
     )

Related Topics

abutAccessDir Property

abutClass Property

abutCondInclusion Property

abutFunction Property

abutGateNet Property

abutMosStretchMat Property

abutOffset Property

Device Abutment

Creating CMOS Pcells to Use with Abutment

Setting Layout XL Properties

Layout XL Properties