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