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prjunnamed · Dec 3, 2023 · 563ea16 · 563ea16
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diff --git a/.doctrees/environment.pickle b/.doctrees/environment.pickle
diff --git a/.doctrees/xc9500/jtag.doctree b/.doctrees/xc9500/jtag.doctree
diff --git a/_sources/xc9500/jtag.rst.txt b/_sources/xc9500/jtag.rst.txt
@@ -23,7 +23,7 @@ IR           Instruction  Register             Notes
 ``11101001`` ``ISPENC``   ``ISPENABLE``        XC9500XL/XV only
 ``11101010`` ``FPGM``     ``ISPCONFIGURATION``
 ``11101011`` ``FPGMI``    ``ISPDATA``
-``11101100`` ``FERASE``   ``ISPCONFIGURATION`` XC9500 only
+``11101100`` ``FERASE``   ``ISPCONFIGURATION`` XC9500 revision 2 and up only
 ``11101100`` ``FERASE``   ``ISPADDRESS``       XC9500XL/XV only
 ``11101101`` ``FBULK``    ``ISPCONFIGURATION`` XC9500 only
 ``11101101`` ``FBULK``    ``ISPADDRESS``       XC9500XL/XV only
@@ -58,7 +58,7 @@ IDCODE
 The IDCODE for XC9500* devices can be determined as follows:
 
 - bits 0-11: vendor code, ``0x093``
-- bits 12-19: number of FBs in the device
+- bits 12-19: number of FBs in the device encoded as BCD
 - bits 20-27: device kind
 
   - ``0x95``: XC9500
@@ -67,6 +67,9 @@ The IDCODE for XC9500* devices can be determined as follows:
 
 - bits 28-31: device revision (varies)
 
+For XC9500, device revisions older than 2 do not support the ``FBULK`` instruction and
+require using ``FERASE``.
+
 
 Boundary scan register
 ======================
@@ -184,6 +187,9 @@ There are two instructions that erase fuses:
 - ``FBULK``: erases either all main areas on the device at once, or all UIM wire-AND areas
   at once
 
+Note that the ``FBULK`` instruction is not supported on (rarely seen) XC9500 devices with
+revision older than 2.
+
 An erase operation is triggered by the following sequence:
 
 1. The DR is written in one of the above opcodes with strobe set to 1 and valid set to 0

diff --git a/searchindex.js b/searchindex.js
diff --git a/xc9500/jtag.html b/xc9500/jtag.html
@@ -168,7 +168,7 @@ <h2>IR<a class="headerlink" href="#ir" title="Link to this heading"></a></h2>
 <tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">11101100</span></code></p></td>
 <td><p><code class="docutils literal notranslate"><span class="pre">FERASE</span></code></p></td>
 <td><p><code class="docutils literal notranslate"><span class="pre">ISPCONFIGURATION</span></code></p></td>
-<td><p>XC9500 only</p></td>
+<td><p>XC9500 revision 2 and up only</p></td>
 </tr>
 <tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">11101100</span></code></p></td>
 <td><p><code class="docutils literal notranslate"><span class="pre">FERASE</span></code></p></td>
@@ -246,7 +246,7 @@ <h2>IDCODE<a class="headerlink" href="#idcode" title="Link to this heading"><
 <p>The IDCODE for XC9500* devices can be determined as follows:</p>
 <ul class="simple">
 <li><p>bits 0-11: vendor code, <code class="docutils literal notranslate"><span class="pre">0x093</span></code></p></li>
-<li><p>bits 12-19: number of FBs in the device</p></li>
+<li><p>bits 12-19: number of FBs in the device encoded as BCD</p></li>
 <li><p>bits 20-27: device kind</p>
 <ul>
 <li><p><code class="docutils literal notranslate"><span class="pre">0x95</span></code>: XC9500</p></li>
@@ -256,6 +256,8 @@ <h2>IDCODE<a class="headerlink" href="#idcode" title="Link to this heading"><
 </li>
 <li><p>bits 28-31: device revision (varies)</p></li>
 </ul>
+<p>For XC9500, device revisions older than 2 do not support the <code class="docutils literal notranslate"><span class="pre">FBULK</span></code> instruction and
+require using <code class="docutils literal notranslate"><span class="pre">FERASE</span></code>.</p>
 </section>
 <section id="boundary-scan-register">
 <h2>Boundary scan register<a class="headerlink" href="#boundary-scan-register" title="Link to this heading"></a></h2>
@@ -365,6 +367,8 @@ <h3>Erasing fuses — XC9500<a class="headerlink" href="#erasing-fuses-xc9500" t
 <li><p><code class="docutils literal notranslate"><span class="pre">FBULK</span></code>: erases either all main areas on the device at once, or all UIM wire-AND areas
 at once</p></li>
 </ul>
+<p>Note that the <code class="docutils literal notranslate"><span class="pre">FBULK</span></code> instruction is not supported on (rarely seen) XC9500 devices with
+revision older than 2.</p>
 <p>An erase operation is triggered by the following sequence:</p>
 <ol class="arabic simple">
 <li><p>The DR is written in one of the above opcodes with strobe set to 1 and valid set to 0</p></li>