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# FMC Time to Digital Converter: FMC TDC 1ns 5cha
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# Functional system specifications
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# System specifications
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- 5 inputs, TTL with 50 Ohm termination.
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- Time tags apply to rising edges of inputs.
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- Time tags (64 bits) apply to rising edges of inputs.
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- 1 ns resolution or better.
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- Accuracy (of time-tag differences between channels): */- (500 ps*
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timebase accuracy).
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pulse width of at least 10us @ 50Hz (with protection diodes if
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possible).
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- SMC connectors for all inputs.
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- Minimum input pulse width: 100 ns. Pulses shorter than 20ns should
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be ignored.
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- Minimum input pulse width: 100 ns. Narrower pulses should be
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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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input pulses. These time tags will at first be rough UTC (counter
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initialized by SW) giving ~ms accuracy. Later, with a WR-enabled
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