https://bitwiz.io/tags/tooling/Recent content in Tooling on bitwizHugoen-usThu, 01 Jan 2026 00:00:00 +0000https://bitwiz.io/projects/constraint-lint/Thu, 01 Jan 2026 00:00:00 +0000https://bitwiz.io/projects/constraint-lint/<h2 id="the-problem">The Problem</h2> <p>Your XDC file is code. Vivado doesn&rsquo;t lint it.</p> <div class="highlight"><pre tabindex="0" class="chroma"><code class="language-tcl" data-lang="tcl"><span class="line"><span class="cl"><span class="nv">create_clock</span> <span class="o">-</span>name clk156 <span class="o">-</span>period <span class="mf">6.400</span> <span class="k">[</span><span class="nv">get_ports</span> clk_156<span class="k">]</span> </span></span></code></pre></div><p>The port is <code>clk156</code>. The clock attaches to nothing. Vivado warns once. It disappears into 200k lines of logs.</p> <p>Your constraint file says the clock exists. Your log has one warning: no valid objects matched. WNS is meaningless because the domain you thought you constrained doesn&rsquo;t exist. You find out in the lab.</p> <hr> <h2 id="what-constraint-lint-does">What constraint-lint Does</h2> <p>Lint for XDC/SDC. Runs in CI. Turns constraint warnings into hard failures.</p>