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https://www.ohwr.org/3013
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*Figure 2: FMC TDC mezzanine gateware architecture*
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As of June 2014 the TDC design has been extended to include [White
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Rabbit](https://www.ohwr.org/project/white-rabbit/wiki) support. As
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Figure 3 shows the White Rabbit modules are instantiated on the top
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level of the design; the TDC modules remain the same as described.
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The White Rabbit support enables the TDC design to be used for
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*absolute timestamping** of pulses, rather than calculating differences
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of pulses.
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The **timebase accuracy** is reduced to \< 1 ns, in comparison to the
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4ppm of the TDC local oscillator. Also pulses coming from different TDC
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boards in the same White Rabbit network can now be compared to each
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other.
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https://www.ohwr.org/3015
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*Figure 2: FMC TDC mezzanine gateware architecture with White Rabbit
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support*
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For more information on the FMC TDC gateware design, plese consult the
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dedicated gateware guide:
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