diff --git a/util/i2csvg/i2csvg_data.py b/util/i2csvg/i2csvg_data.py
new file mode 100644
index 0000000..c9e7c0e
--- /dev/null
+++ b/util/i2csvg/i2csvg_data.py
@@ -0,0 +1,141 @@
+# Copyright lowRISC contributors.
+# Licensed under the Apache License, Version 2.0, see LICENSE for details.
+# SPDX-License-Identifier: Apache-2.0
+#
+# Svg data for I2C display
+
+# constants in svg tag
+svgtag_consts = """
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:xlink="http://www.w3.org/1999/xlink"
+   overflow="hidden"
+"""
+
+# styles
+svgstyle = """
+    <style type="text/css">
+      text { font-size: 11pt; font-style: normal; font-variant:
+      normal; font-weight: bold; font-stretch: normal;
+      text-align: center; text-anchor: middle; fill-opacity: 1; font-family:
+      Helvetica }
+
+      .tt {
+      text-anchor: start; font-weight: normal; font-size: 10pt;
+      font-family: monospace
+      }
+
+      .shost {
+      fill: none;
+      stroke: #000;
+      stroke-width: 1;
+      stroke-linecap: round;
+      stroke-linejoin: miter;
+      stroke-miterlimit: 4;
+      stroke-opacity: 1;
+      stroke-dasharray: none
+      }
+
+      .dash {
+      fill: none;
+      stroke: #000;
+      stroke-width: 1;
+      stroke-linecap: butt;
+      stroke-linejoin: miter;
+      stroke-miterlimit: 4;
+      stroke-opacity: 1;
+      stroke-dasharray: 8;
+      }
+
+      .sdev {
+      fill: #CCC;
+      stroke: #000;
+      stroke-width: 1;
+      stroke-linecap: round;
+      stroke-linejoin: miter;
+      stroke-miterlimit: 4;
+      stroke-opacity: 1;
+      stroke-dasharray: none
+      }
+
+
+    </style>
+"""
+
+# width of the svg
+svgw = 1000
+
+# svg defs are made with a bit-box 20,40 so set constants based on that
+bitw = 20
+bith = 40
+bytew = 160
+
+# text is offset from the top of a bit
+txty = 25
+
+# formatting:
+wrap = 880  # the wrap point for long transactions
+cindent = 60  # the indentation for continuation lines
+linesep = 50  # separation between lines
+
+svg_defs = """
+    <defs>
+      <g id="start">
+        <path d="M0,0 h 20 m0,40 h -20 v -40" class="shost" />
+        <text x="10" y="25">S</text>
+      </g>
+      <g id="pstop">
+        <path d="M0,0 h 20 v 40 h -20 M0,0" class="shost" />
+        <text x="10" y="25">P</text>
+      </g>
+      <g id="ackh">
+        <path d="M0,0 h 20 v 40 h -20 v -40" class="shost" />
+        <text x="10" y="25">A</text>
+      </g>
+      <g id="ackd">
+        <path d="M0,0 h 20 v 40 h -20 v -40" class="sdev" />
+        <text x="10" y="25">A</text>
+      </g>
+      <g id="nackh">
+        <path d="M0,0 h 20 v 40 h -20 v -40" class="shost" />
+        <text x="10" y="25">N</text>
+      </g>
+      <g id="nackd">
+        <path d="M0,0 h 20 v 40 h -20 v -40" class="sdev" />
+        <text x="10" y="25">N</text>
+      </g>
+      <g id="norackd">
+        <path d="M0,0 h 20 v 40 h -20 v -40" class="sdev" />
+        <text x="5" y="15">A/</text>
+        <text x="15" y="35">N</text>
+      </g>
+      <g id="skip">
+        <path d="M0,0 h 8 l-5,30 l5,-10 l-5,20 h -3 v -40" class="shost" />
+        <path d="M17,0 h 3 v 40 h -8 l5,-30 l-5,10 l5,-20" class="shost" />
+      </g>
+      <g id="hbyte">
+        <path d="M0,0 h 160 m0,40 h -160 v -40" class="shost" />
+      </g>
+      <g id="dbyte">
+        <path d="M0,0 h 160 v 40 h -160 v -40" class="sdev" />
+      </g>
+      <g id="adr0">
+        <path d="M0,0 h 160 m0,40 h -160 v -40" class="shost" />
+        <path d="M140,0 v 40" class="dash" />
+        <text x="80" y="25">Adr</text>
+        <text x="150" y="25">wr</text>
+      </g>
+      <g id="adr1">
+        <path d="M0,0 h 160 m0,40 h -160 v -40" class="shost" />
+        <path d="M140,0 v 40" class="dash" />
+        <text x="80" y="25">Adr</text>
+        <text x="150" y="25">rd</text>
+      </g>
+      <g id="adr2">
+        <path d="M0,0 h 160 m0,40 h -160 v -40" class="shost" />
+        <path d="M140,0 v 40" class="dash" />
+        <text x="80" y="25">Adr</text>
+        <text x="150" y="25">d</text>
+      </g>
+
+    </defs>
+"""