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# FMC Time to Digital Converter: FMC Delay 1ns 5cha
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# FMC Time to Digital Converter: FMC TDC 1ns 5cha
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# Functional system specifications
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# Functional system specifications
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... | @@ -10,7 +10,7 @@ |
... | @@ -10,7 +10,7 @@ |
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- Timebase accuracy: +/- 4ppm.
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- Timebase accuracy: +/- 4ppm.
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- Implementation details: timebase from a local TCXO on FMC card
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- Implementation details: timebase from a local TCXO on FMC card
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and needs calibration. The 4ppm accuracy will only be reached
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and needs calibration. The 4ppm accuracy will only be reached
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when used on a White Rabbit enabled FMC carrier.
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when used on a White Rabbit enabled FMC carrier.
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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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... | @@ -23,6 +23,11 @@ |
... | @@ -23,6 +23,11 @@ |
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solution, they can be much more accurate. Differences between
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solution, they can be much more accurate. Differences between
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channels will not suffer from this accuracy problem because the
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channels will not suffer from this accuracy problem because the
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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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- Clock for internal time base is fed to a 6th TDC channel from the
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FMC connector. This allows usage of the TCXO in the carrier, a
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WR-derived clock or one coming from alternative sources such as the
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e-SATA connectors in the PFC board.
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