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vivado-cdc

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Actualizado22 de abril de 2026 a las 23:03

Analyze and fix clock domain crossing violations. Use when CDC violations appear, when auditing multi-clock designs, or when reviewing set_false_path and set_max_delay exceptions for safety.

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devansh0703

devansh0703/vivaclaw-agent

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SKILL.md

readonly

name	vivado-cdc
version	1.0.0
description	Analyze and fix clock domain crossing violations. Use when CDC violations appear, when auditing multi-clock designs, or when reviewing set_false_path and set_max_delay exceptions for safety.
metadata	{"openclaw":{"requires":{"bins":["vivado"]},"emoji":"🔀"}}

Vivado CDC Runbook

1. CDC Reporting

report_cdc -details -waived -file /tmp/vivaclaw_rpt/cdc_details.rpt
report_clock_interaction -delay_type min_max -significant_only -file /tmp/vivaclaw_rpt/clock_interaction.rpt

2. CDC Classifications & Fixes

Type	Classification	Action
A	Single-bit Control	2-FF Sync + `ASYNC_REG TRUE`
B	Multi-bit Data Bus	FIFO/Handshake ONLY. Review Required.
C	Gray Counter	`set_max_delay -datapath_only <period_dst>`
D	FIFO Crossing	Verify depth/flags sync.
E	MUX Static Path	`set_false_path` (Static signals only).
F	Reset Crossing	Async assert, Sync deassert.

3. Asynchronous Clock Groups

set_clock_groups -asynchronous \
  -group [get_clocks clk_a] \
  -group [get_clocks clk_b]

4. MTBF Analysis

report_synchronizer_mtbf -file /tmp/vivaclaw_rpt/mtbf.rpt

Target: >1e6 hours. If lower, increase sync chain depth to 3 FFs.

5. Waiver Protocol

Every waived path must include a reason: # CDC WAIVER | Type: <X> | Reason: <description> | Confirmed: VivaClaw

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name	vivado-cdc
version	1.0.0
description	Analyze and fix clock domain crossing violations. Use when CDC violations appear, when auditing multi-clock designs, or when reviewing set_false_path and set_max_delay exceptions for safety.
metadata	{"openclaw":{"requires":{"bins":["vivado"]},"emoji":"🔀"}}

Vivado CDC Runbook

1. CDC Reporting

report_cdc -details -waived -file /tmp/vivaclaw_rpt/cdc_details.rpt
report_clock_interaction -delay_type min_max -significant_only -file /tmp/vivaclaw_rpt/clock_interaction.rpt

2. CDC Classifications & Fixes

Type	Classification	Action
A	Single-bit Control	2-FF Sync + `ASYNC_REG TRUE`
B	Multi-bit Data Bus	FIFO/Handshake ONLY. Review Required.
C	Gray Counter	`set_max_delay -datapath_only <period_dst>`
D	FIFO Crossing	Verify depth/flags sync.
E	MUX Static Path	`set_false_path` (Static signals only).
F	Reset Crossing	Async assert, Sync deassert.

3. Asynchronous Clock Groups

set_clock_groups -asynchronous \
  -group [get_clocks clk_a] \
  -group [get_clocks clk_b]

4. MTBF Analysis

report_synchronizer_mtbf -file /tmp/vivaclaw_rpt/mtbf.rpt

Target: >1e6 hours. If lower, increase sync chain depth to 3 FFs.

5. Waiver Protocol

Every waived path must include a reason: # CDC WAIVER | Type: <X> | Reason: <description> | Confirmed: VivaClaw