Create ROD Rectangle (DIFF) PCell

This document describes a minimal, production-quality ROD-based rectangular PCell implemented in Cadence SKILL. The example focuses on clean geometry creation, parameterization, and robust pin definition.

Overview

The rect_pcell generates a rectangular DIFF shape with a MET1 pin placed on the top edge. It is designed to be stretch-safe, LVS-clean, and compatible with modern DFM and verification flows.

PCell Parameters

Parameter	Type	Default	Description
w	float	2.0	Width of the rectangle (µm)
h	float	1.0	Height of the rectangle (µm)
pinName	string	P	Name of the MET1 pin

Geometry Creation

A ROD rectangle is created on the DIFF layer using rodCreateRect. The rectangle origin is fixed at (0,0), ensuring deterministic stretch behavior when parameters are modified.

ROD-based geometry for stretch safety
Fully parameterized width and height
Deterministic coordinate frame

Pin Definition

A MET1 pin is created at the center of the top edge of the DIFF rectangle. The pin width and extension follow minimum metal rules to ensure LVS recognition and clean connectivity.

Pin purpose: terminal
Centered horizontally on the rectangle
Vertical extension above DIFF

Label and Stretch Behavior

A label is attached to the MET1 pin to support interactive stretching and clear identification.

Alignment: centerLeft
Stretch mode: stick
Snap grid: 0.12 µm

Design Best Practices

Typed PCell parameters
ROD-based geometry instead of raw db shapes
Explicit pin creation (not label-based)
Technology-rule-aware layout construction

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