Snapping Mode

This section lets you select the pins to be snapped.

All

Snaps all pins in the design.

Selected

Snaps only the selected pins.

Inside PR Boundary Offset

Prevents snapping of pins that are away from the PR boundary offset and edges.

Snap To Boundary And Track

Snaps pins to the PR boundary and to the nearest WSP track. This option can be run on all pins, selected pins, or pins within a certain offset from the PR boundary.

Environment variable: pinSnapModeSnapPins

Snap To Track

Snaps pins to the nearest WSP track without snapping them to the PR boundary. In this case, Layer Awareness and Width Awareness are disabled.

Environment variable: pinSnapModeSnapPins

Advance Node Options

This section lets you specify the advanced node options.

Constraint Aware

Honors the following constraints during pin snapping: Wire type, width, order, bus, side, edge, pin group guide, layer per side, blockages, and pre placed pins.

When this option is selected, pins are snapped to the nearest WSP track honoring the wire type constraints as shown in the following figure.

Wire type constraints are read in the following sequence, based on their availability:

1. Constraint system
2. Environment variables: powerWireTypes, groundWireTypes, and signalWireTypes

These environment variables are valid only in Snap To Track - Constraint Aware mode.

In non-constraint-aware mode, pins are snapped to the nearest WSP track. Wire type checking is not done while snapping pins to the nearest track as shown in the following figure.

The Length Awareness options are honored in both constraint-aware and non-constraint-aware modes.

Layer Awareness

Specifies the layers on which the pins are to be placed after they are snapped.

Retain Pin Layer

Snaps pins to the nearest WSP tracks, while retaining the pins in their original layers and honoring all applicable pin constraints.

Auto Assign Pin Layer

Assigns pin layers to the sides of the block.

During snapping, pins are moved to the nearest soft block edges and are re-layered as per your specifications. Use the two list boxes in this section to make the required pin layer assignments. When this option is selected, the default pin layer and side constraint values are loaded based on the snapGridVertical and snapGridHorizontal constraints defined in the technology file.

• WSSPDefs with the snapGridVertical constraint have tracks intersecting with the left and right edges.
• WSSPDefs with the snapGridHorizontal constraint have tracks intersecting with the top and bottom edges.

Update Pin Layers

Displays the selected pin layer in the Pin Layers column in the first box.

Clear Pin Layers

Clears the pin layers of the selected side.

Width Awareness

This section lets you control the width of the snapped pins.

Fixed Pin Width

Snaps pins to the nearest WSP tracks with matching or higher pin widths.

Length Awareness

This section lets you control the length of the snapped pins.

Square pin

Pins are converted to square shapes after snapping.

Retain Pin Length

The pin length is retained after snapping to WSP tracks.

Honor Minimum Length

The length of the snapped pins is set to the minimum pin length specified in the technology file.

When Snap To Track is selected and the pin length is less than the minimum length specified in the constraint, the pin is resized to a length equal to the specified value while snapping to nearest WSP track. The pin width is the same as the WSP track width.

Snap Pins

Snaps all the top-level and level-1 pins to appropriate grids. The pins with placement status as Fixed are also snapped, and their status is retained as Fixed.