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# System specifications
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# System specifications
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- 5 inputs, TTL with 50 Ohm termination.
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- 5 inputs, TTL with software selectable 50 Ohm termination.
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- Time tags apply to rising edges of inputs. They are made of two
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- Time tags apply to rising edges of inputs. They are made of two
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parts: 32 bits for the UTC second and as many bits as needed for the
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parts: 32 bits for the UTC second and as many bits as needed for the
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fractional part within the second (will depend on final choice of
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fractional part within the second (will depend on final choice of
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- External inputs need to be protected against +15V pulses with a
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- External inputs need to be protected against +15V pulses with a
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pulse width of at least 10us @ 50Hz (with protection diodes if
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pulse width of at least 10us @ 50Hz (with protection diodes if
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possible).
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possible).
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- SMC connectors for all inputs. Actually lemo connectors are
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- LEMO connectors for all inputs. SMC connectors may be mounted
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preferred by the main client (CERN's TE-ABT group), to be discussed.
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instead.
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- Minimum input pulse width: 100 ns. Narrower pulses should be
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- Minimum input pulse width: 100 ns. Narrower pulses should be
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ignored.
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ignored.
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- A circular buffer will contain time tags for at least the last 100
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- A circular buffer will contain time tags for at least the last 100
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offset with respect to UTC will cancel.
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offset with respect to UTC will cancel.
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- Programmable (enable/disable) host interrupts on all 5 channels.
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- Programmable (enable/disable) host interrupts on all 5 channels.
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- FMC mezzanine using a Low Pin Count (LPC) connector.
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- FMC mezzanine using a Low Pin Count (LPC) connector.
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- Vadj is 2.5V.
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- Vadj 2.5V or higher.
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- [OriginalSystemSpec](OriginalSystemSpec)
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-----
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-----
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<td>09-03-2011</td>
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<td>09-03-2011</td>
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<td>First schematic available. (need to replace LEDs)</td>
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<td>First schematic available. (need to replace LEDs)</td>
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</tr>
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</tr>
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<tr class="odd">
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<td>18-03-2011</td>
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<td>Second schematics design review held.</td>
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</tr>
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</tbody>
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</tbody>
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</table>
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</table>
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-----
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-----
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Javier Serrano, Erik van der Bij - 14 March 2011
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Javier Serrano, Erik van der Bij - 18 March 2011
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