clock-domain-crossing

What problem does it solve?

Clock-domain-crossing (CDC) techniques prevent metastability, data corruption, and CDC tool violations when signals move between asynchronous or unrelated clock domains.

Core Features & Use Cases

• CDC pattern selection: choose the right approach for single-bit synchronizers, multi-bit async FIFOs, req/ack handshakes, pulse/toggle synchronizers, and reset synchronizers.
• Robust RTL guidance: implement safe synchronizer structures with correct attributes (e.g., ASYNC_REG) and avoid known anti-patterns like synchronizing raw binary multi-bit buses.
• SDC/constraint correctness: apply timing constraints that bound CDC arrival time using set_max_delay -datapath_only and use appropriate reset handling/waivers when tools legitimately flag async assertions.
• Validation checklist: verify the design meets CDC correctness requirements before declaring the work complete.

Quick Start

Use the clock-domain-crossing skill to identify the correct CDC architecture for your specific crossing and generate the RTL patterns and SDC constraints to match it.