Virtuoso XL Layout Editor User Guide

Editing Your Layout with Virtuoso XL Layout Editor

Zoom enlarges the flight lines and the area around them.

All Displayed Flight Lines enlarges as much of an area as possible around all the flight lines.

Individual Flight Line Segments enlarges as much of an area as possible around individual flight lines. This option displays the zoom arrows.

Zoom arrows (--> and <--) display each net individually in the order listed in the Display field.

To zoom out again after viewing individual flight line segments, in theZoom section, select

All Displayed Flight Lines, then in the Incomplete section, click Select All, and then click Zoom.

The list box at the bottom of the form tells how many incomplete nets are in the design and how many incomplete nets are displayed.

Stretch Form

Snap Mode controls the direction in which you can move the object.

Lock Angles, when on, prevents you from changing the angle of a corner or edge as you stretch it.

Delta X/Y allows you to specify the distance to stretch the selected objects in the X and/or Y direction.

Apply XY invokes the distance specified in theDelta X/Y fields.

Display Draglines, when on, displays rubberbanding lines that connect pins of the object you are moving to pins of the nearest objects.

Virtuoso XL Layout Editor User Guide

Editing Your Layout with Virtuoso XL Layout Editor

Use “ignore” for Stretchable Pcells reminds you to choose the ignore option in the

Constraint Assisted Control section when you are working with stretchable pcells because, if

Constraint Assisted Controls are active, you cannot use the stretch handle to stretch pcells.

Constraint Assisted Control allows objects to be moved only in ways that satisfy the constraints entered using the constraint manager.

together moves preselected objects in the layout as a group.

individually moves preselected objects in the layout individually.

ignore specifies that constraints have no effect on objects in the layout when they are moved.

Virtuoso XL Alignment Form

Alignment Direction defines the alignment direction.

horizontal aligns objects in the X direction.

vertical aligns objects in the Y direction.

Align Using indicates how objects are aligned as per the Selection Mode. For preselected objects you can use the following options.

Component BBox aligns the Reference Point of the components bounding box

Component Origin aligns the origin of the component.

Layer BBox aligns the Reference Point of the specifiedLayer.

For Post selection use the following available options. Notice that the Reference Point options do not pertain to post selection.

Component Center aligns the centers of components.

Component Edge aligns the left, right, top, or bottom edges of the component.

Component Origin aligns the origins of the objects.

Layer Center aligns the centers of the shapes on the current layer.

Layer Edge aligns the left, right, top, or bottom edges of the shapes on the current layer.

Layer is a cyclic field showing the layers defined in your technology file. Use this field to specify the layer to use for aligning by layer edge, center, or BBox.

Virtuoso XL Layout Editor User Guide

Editing Your Layout with Virtuoso XL Layout Editor

Reference Point is used with preselection mode options Component BBox and Layer

BBox. Specify upperLeft, centerLeft, lowerLeft, upperCenter, centerCenter, lowerCenter, upperRight, centerRight, or lowerRight.

Apply Spacings specifies the spacing between the aligned components.

None does not put any space between the components. This option can cause errors in your design.

Component Pitch is used with preselect mode. The distance (in user units) for center to center spacing between aligned shapes. You can set this value to a negative number to overlap instance.

Component Space is used with both preselect and postselect mode. The distance (in user units) to maintain between aligned shapes. You can set this value to a negative number to overlap instances.

Pitches is the value when using the Component Pitch option.

Spacing is the value when using the Component Space command.

Sort Components By allows you to change how the selected objects are sorted in relationship to the reference object. This option only works with preselected objects.

Align Direction Order sorts the objects by the alignment direction order.

Horizontal Order sorts the objects aligned horizontally.

Vertical Order sorts the objects aligned vertically.

Order Selected sorts the objects in the order that they were selected.

Instance Name sorts the objects aligned by instance name.

Net Name sorts the objects aligned by net name.

Reverse Sort allows you to reverse the sorted objects.

Selection Mode allows you to align components that are preselected or postselected.

Set reference to align preselected objects works on the preselected set of components in the design.

Set reference and select objects to be aligned allows you to set the options on the Alignment form and then selects the components to be aligned.

Set New Reference specifies the reference for the selected components to be aligned to.