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# White Rabbit PTP Core (WRPC)
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Black-box standalone WR-PTP protocol core, incorporating a CPU, WR MAC
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and
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PLLs.
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The White Rabbit PTP Core is an Ethernet MAC implementation capable of
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providing precise timing. It can be used for sending and receiving
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regular Ethernet frames between user-defined HDL modules and a physical
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medium. It also implements the White Rabbit protocol to provide
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sub-nanosecond time synchronization.
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The White Rabbit PTP Core can operate in one of the following modes:
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• GrandMaster: WR Master synchronized to an external 1-PPS and 10 MHz
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clock signal, propagates precise timing to other WR-compliant devices
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• Master: WR Master with free-running oscillator, propagates precise
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timing to other WR-compliant devices
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• Slave: synchronizes its internal oscillator to another WR Master
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device
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## WR PTP Core external interfaces
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