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 # FMC 5-channel Digital I/O module
 
+The 5-channel digital I/O module is a simple board for digital I/O on
+LEMO connectors.  
+It has been designed for testing White Rabbit functionality as part of
+the SPEC Demonstration Package for White Rabbit
+([manual](https://www.ohwr.org/project/spec/uploads/cecd5d18256f5ac94f7f2207c7e777bc/spec-demo-2011-09-02.pdf)),
+but can be used for other applications too.
+
 ## Functional specifications
 
   - 5 input/output ports (Lemo 00 connectors)
   - Output levels: LVTTL, capable of driving +3.3 V over a 50-Ohm load.
-    At power-up the outputs should be in Hi-Z state.
+    At power-up the outputs should be in Hi-Z state
   - Input levels: any logic standard from Vih = 1 V to Vih = 5 V
-    (programmable threshold).
+    (programmable threshold)
   - Output Rise/fall times: max. 2 ns
   - Input bandwidth: min. 200 MHz
-  - Programmable 50-Ohm input termination in each channel.
+  - Programmable 50-Ohm input termination in each channel
   - LVDS I/O on the carrier side.
   - One of the inputs shall be capable of driving a global clock net in
-    the carrier's FPGA.
+    the carrier's FPGA
   - Inputs need to be protected against +15V pulses with a pulse width
-    of at least 10us @ 50Hz (with protection diodes if possible).
+    of at least 10us @ 50Hz (with protection diodes if possible)
   - Need to withstand a continuous short-circuit on all the outputs at
-    the same time.
+    the same time
 
 ## Project Status
 
@@ -35,15 +42,15 @@
 <td>Five cards built. Contains bugs.</td>
 </tr>
 <tr class="even">
-<td>12-08-2011</td>
-<td>Schematics should be updated before passing through CERN's design office.</td>
+<td>20-09-2011</td>
+<td>Updated schematics in SVN. Will pass through CERN's design office.</td>
 </tr>
 </tbody>
 </table>
 
 -----
 
-Tom Wlostowski, Erik van der Bij - 12 August 2011
+Tom Wlostowski, Erik van der Bij - 20 September 2011