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Cdc analysis

Skill a5c-ai/babysitter/library/specializations/fpga-programming/skills/cdc-analysis

Specialized skill for clock domain crossing analysis and synchronizer design in FPGA designsFrom its SKILL.md

Install
npx -y skills add a5c-ai/babysitter --skill cdc-analysis

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SKILL.md

2.1 KB, 379 tokens by cl100k_base, as published. Nobody here has run it

CDC Analysis Skill

Overview

Expert skill for Clock Domain Crossing (CDC) analysis and synchronizer design, ensuring metastability-safe multi-clock FPGA designs.

Capabilities

  • Identify all clock domain crossings in RTL
  • Design 2FF and 3FF synchronizers with ASYNC_REG
  • Implement Gray code counters for async FIFOs
  • Design handshake protocols (req-ack, valid-ready)
  • Calculate MTBF for synchronizers
  • Generate CDC constraints (set_false_path, set_max_delay)
  • Detect CDC violations (reconvergence, data stability)
  • Support Xilinx CDC-aware design flows

Target Processes

  • cdc-design.js
  • reset-strategy.js
  • clock-network-design.js
  • timing-constraints.js

Usage Guidelines

Synchronizer Types

  • 2FF Synchronizer: Standard single-bit synchronization (MTBF > 100 years typical)
  • 3FF Synchronizer: High-reliability applications
  • Pulse Synchronizer: Edge detection across domains
  • Handshake Synchronizer: Multi-bit data with control signals

FIFO Design

  • Use Gray code for pointer crossing
  • Ensure proper empty/full flag generation
  • Consider almost-empty/almost-full for flow control
  • Apply correct FIFO depth calculation

Constraint Guidelines

  • set_false_path for 2FF synchronizer paths
  • set_max_delay for data bus with valid synchronization
  • set_clock_groups for asynchronous clocks
  • Apply ASYNC_REG attribute to synchronizer flip-flops

CDC Violations to Detect

  • Combinational logic between synchronizer stages
  • Fan-out from unsynchronized signals
  • Reconvergence of synchronized signals
  • Data stability violations

Dependencies

  • CDC analysis tool integration
  • Vendor-specific CDC rule knowledge
  • Metastability theory understanding

What ships with it: 1 file

772 B alongside SKILL.md

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