diff --git a/doc/pic.drawio b/doc/pic.drawio
index 547a611..d96fc65 100644
--- a/doc/pic.drawio
+++ b/doc/pic.drawio
@@ -1,6 +1,6 @@
-<mxfile host="Electron" modified="2023-11-01T06:04:15.222Z" agent="Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) draw.io/21.2.8 Chrome/112.0.5615.165 Electron/24.2.0 Safari/537.36" etag="drw3QR3riN7SOdcIUtaV" version="21.2.8" type="device">
+<mxfile host="Electron" modified="2023-11-01T06:11:06.013Z" agent="Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) draw.io/21.2.8 Chrome/112.0.5615.165 Electron/24.2.0 Safari/537.36" etag="4tOil3yPLSnD9o39OaK8" version="21.2.8" type="device">
   <diagram name="Page-1" id="aqkBykuImbnj1wh3Ue84">
-    <mxGraphModel dx="2490" dy="1125" grid="1" gridSize="10" guides="1" tooltips="1" connect="1" arrows="1" fold="1" page="1" pageScale="1" pageWidth="850" pageHeight="1100" math="0" shadow="0">
+    <mxGraphModel dx="2096" dy="855" grid="1" gridSize="10" guides="1" tooltips="1" connect="1" arrows="1" fold="1" page="1" pageScale="1" pageWidth="850" pageHeight="1100" math="0" shadow="0">
       <root>
         <mxCell id="0" />
         <mxCell id="1" parent="0" />
@@ -194,7 +194,7 @@
         </mxCell>
         <mxCell id="3cJaNxErLRnUAumjy6m_-44" value="trigger_type" style="edgeLabel;html=1;align=center;verticalAlign=middle;resizable=0;points=[];" vertex="1" connectable="0" parent="3cJaNxErLRnUAumjy6m_-36">
           <mxGeometry x="-0.5646" y="-2" relative="1" as="geometry">
-            <mxPoint x="-78" y="173" as="offset" />
+            <mxPoint x="-28" y="107" as="offset" />
           </mxGeometry>
         </mxCell>
         <mxCell id="3cJaNxErLRnUAumjy6m_-104" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;entryX=0.75;entryY=1;entryDx=0;entryDy=0;shape=flexArrow;" edge="1" parent="1" source="3cJaNxErLRnUAumjy6m_-38" target="3cJaNxErLRnUAumjy6m_-102">
@@ -261,7 +261,7 @@
         </mxCell>
         <mxCell id="3cJaNxErLRnUAumjy6m_-48" value="int_en" style="edgeLabel;html=1;align=center;verticalAlign=middle;resizable=0;points=[];" vertex="1" connectable="0" parent="3cJaNxErLRnUAumjy6m_-47">
           <mxGeometry x="-0.5646" y="-2" relative="1" as="geometry">
-            <mxPoint x="-168" y="83" as="offset" />
+            <mxPoint x="-147" y="83" as="offset" />
           </mxGeometry>
         </mxCell>
         <mxCell id="3cJaNxErLRnUAumjy6m_-98" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;exitX=0.75;exitY=1;exitDx=0;exitDy=0;entryX=0;entryY=0.5;entryDx=0;entryDy=0;shape=flexArrow;" edge="1" parent="1" source="3cJaNxErLRnUAumjy6m_-90" target="3cJaNxErLRnUAumjy6m_-96">
@@ -270,7 +270,7 @@
         <mxCell id="3cJaNxErLRnUAumjy6m_-101" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;exitX=0.25;exitY=1;exitDx=0;exitDy=0;entryX=0.5;entryY=0;entryDx=0;entryDy=0;shape=flexArrow;" edge="1" parent="1" source="3cJaNxErLRnUAumjy6m_-90" target="3cJaNxErLRnUAumjy6m_-99">
           <mxGeometry relative="1" as="geometry" />
         </mxCell>
-        <mxCell id="3cJaNxErLRnUAumjy6m_-90" value="" style="shape=trapezoid;perimeter=trapezoidPerimeter;whiteSpace=wrap;html=1;fixedSize=1;rotation=-90;" vertex="1" parent="1">
+        <mxCell id="3cJaNxErLRnUAumjy6m_-90" value="data_in mux" style="shape=trapezoid;perimeter=trapezoidPerimeter;whiteSpace=wrap;html=1;fixedSize=1;rotation=-90;" vertex="1" parent="1">
           <mxGeometry x="15.030000000000015" y="119.74000000000001" width="120" height="60" as="geometry" />
         </mxCell>
         <mxCell id="3cJaNxErLRnUAumjy6m_-91" value="" style="shape=flexArrow;endArrow=classic;html=1;rounded=0;entryX=0.5;entryY=0;entryDx=0;entryDy=0;" edge="1" parent="1" target="3cJaNxErLRnUAumjy6m_-90">
@@ -314,10 +314,43 @@
             <mxPoint x="16" y="-20" as="offset" />
           </mxGeometry>
         </mxCell>
+        <mxCell id="3cJaNxErLRnUAumjy6m_-120" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;exitX=0.25;exitY=1;exitDx=0;exitDy=0;entryX=0.5;entryY=0;entryDx=0;entryDy=0;" edge="1" parent="1" source="3cJaNxErLRnUAumjy6m_-96" target="3cJaNxErLRnUAumjy6m_-38">
+          <mxGeometry relative="1" as="geometry">
+            <Array as="points">
+              <mxPoint x="215" y="160" />
+              <mxPoint x="120" y="160" />
+            </Array>
+          </mxGeometry>
+        </mxCell>
+        <mxCell id="3cJaNxErLRnUAumjy6m_-121" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;exitX=0.25;exitY=1;exitDx=0;exitDy=0;entryX=0.5;entryY=0;entryDx=0;entryDy=0;" edge="1" parent="1" source="3cJaNxErLRnUAumjy6m_-96" target="3cJaNxErLRnUAumjy6m_-11">
+          <mxGeometry relative="1" as="geometry">
+            <Array as="points">
+              <mxPoint x="215" y="160" />
+              <mxPoint x="120" y="160" />
+              <mxPoint x="120" y="370" />
+              <mxPoint x="240" y="370" />
+            </Array>
+          </mxGeometry>
+        </mxCell>
+        <mxCell id="3cJaNxErLRnUAumjy6m_-122" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;exitX=0.25;exitY=1;exitDx=0;exitDy=0;entryX=0.5;entryY=0;entryDx=0;entryDy=0;" edge="1" parent="1" source="3cJaNxErLRnUAumjy6m_-96" target="3cJaNxErLRnUAumjy6m_-12">
+          <mxGeometry relative="1" as="geometry">
+            <Array as="points">
+              <mxPoint x="215" y="160" />
+              <mxPoint x="120" y="160" />
+              <mxPoint x="120" y="370" />
+              <mxPoint x="360" y="370" />
+            </Array>
+          </mxGeometry>
+        </mxCell>
+        <mxCell id="3cJaNxErLRnUAumjy6m_-123" value="byte_en" style="edgeLabel;html=1;align=center;verticalAlign=middle;resizable=0;points=[];" vertex="1" connectable="0" parent="3cJaNxErLRnUAumjy6m_-122">
+          <mxGeometry x="-0.7727" relative="1" as="geometry">
+            <mxPoint y="-10" as="offset" />
+          </mxGeometry>
+        </mxCell>
         <mxCell id="3cJaNxErLRnUAumjy6m_-96" value="CMD register" style="rounded=0;whiteSpace=wrap;html=1;" vertex="1" parent="1">
           <mxGeometry x="185.03000000000003" y="89.74000000000001" width="120" height="60" as="geometry" />
         </mxCell>
-        <mxCell id="3cJaNxErLRnUAumjy6m_-99" value="" style="shape=trapezoid;perimeter=trapezoidPerimeter;whiteSpace=wrap;html=1;fixedSize=1;rotation=-90;" vertex="1" parent="1">
+        <mxCell id="3cJaNxErLRnUAumjy6m_-99" value="data_sel_mux" style="shape=trapezoid;perimeter=trapezoidPerimeter;whiteSpace=wrap;html=1;fixedSize=1;rotation=-90;" vertex="1" parent="1">
           <mxGeometry x="185.03" y="200" width="120" height="60" as="geometry" />
         </mxCell>
         <mxCell id="3cJaNxErLRnUAumjy6m_-106" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;exitX=0.5;exitY=0;exitDx=0;exitDy=0;shape=flexArrow;" edge="1" parent="1" source="3cJaNxErLRnUAumjy6m_-102">
@@ -340,7 +373,12 @@
           <mxGeometry x="360" y="90" width="90" height="59.74" as="geometry" />
         </mxCell>
         <mxCell id="3cJaNxErLRnUAumjy6m_-115" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;entryX=0.75;entryY=0;entryDx=0;entryDy=0;shape=flexArrow;" edge="1" parent="1" source="3cJaNxErLRnUAumjy6m_-113" target="3cJaNxErLRnUAumjy6m_-12">
-          <mxGeometry relative="1" as="geometry" />
+          <mxGeometry relative="1" as="geometry">
+            <Array as="points">
+              <mxPoint x="365" y="360" />
+              <mxPoint x="380" y="360" />
+            </Array>
+          </mxGeometry>
         </mxCell>
         <mxCell id="3cJaNxErLRnUAumjy6m_-113" value="&amp;amp;" style="ellipse;whiteSpace=wrap;html=1;aspect=fixed;" vertex="1" parent="1">
           <mxGeometry x="340" y="280" width="50" height="50" as="geometry" />
@@ -358,6 +396,9 @@
         <mxCell id="3cJaNxErLRnUAumjy6m_-117" value="&lt;h1&gt;EOI shifter&lt;/h1&gt;&lt;p&gt;EOI shifter will do 1 &amp;lt;&amp;lt; IRQN&amp;nbsp;&lt;span style=&quot;background-color: initial;&quot;&gt;and then clear that interrupt in the register&lt;/span&gt;&lt;/p&gt;" style="text;html=1;strokeColor=none;fillColor=none;spacing=5;spacingTop=-20;whiteSpace=wrap;overflow=hidden;rounded=0;" vertex="1" parent="1">
           <mxGeometry x="420" y="170" width="190" height="120" as="geometry" />
         </mxCell>
+        <mxCell id="3cJaNxErLRnUAumjy6m_-119" value="&lt;h1&gt;data_sel_mux&lt;/h1&gt;&lt;p&gt;The upper 3 bits of CMD determine where data goes. The lower 5 bits of cmd determine which of the 32 8 bit registers gets updated. The registers below all of byte enable signals that this is passed to.&lt;/p&gt;" style="text;html=1;strokeColor=none;fillColor=none;spacing=5;spacingTop=-20;whiteSpace=wrap;overflow=hidden;rounded=0;" vertex="1" parent="1">
+          <mxGeometry x="-160" y="210" width="220" height="150.26" as="geometry" />
+        </mxCell>
       </root>
     </mxGraphModel>
   </diagram>