
IEEE 1588v2 Feature (Dword Offset 0xD0 – 0xD6)
Table 6-7: IEEE 1588v2 MAC Registers
HW ResetDescriptionR/WNameDword
Offset
0x0Clock period for timestamp adjustment on the
transmit datapath. The period register is
multiplied by the number of stages separating
actual timestamp and the GMII bus.
• Bits 0 to 15: Period in fractional nanoseconds
(TX_PERIOD_FNS).
• Bits 16 to 24: Period in nanoseconds (TX_
PERIOD_NS).
• Bits 25 to 31: Not used.
The default value for the period is 0. For 125-
MHz clock, set this register to 8 ns.
RWtx_period0xD0
0x0Static timing adjustment in fractional
nanoseconds for outbound timestamps on the
transmit datapath.
• Bits 0 to 15: Timing adjustment in fractional
nanoseconds.
• Bits 16 to 31: Not used.
RWtx_adjust_fns0xD1
0x0Static timing adjustment in nanoseconds for
outbound timestamps on the transmit datapath.
• Bits 0 to 15: Timing adjustment in nanosec-
onds.
• Bits 16 to 23: Not used.
RWtx_adjust_ns0xD2
0x0Clock period for timestamp adjustment on the
receive datapath. The period register is
multiplied by the number of stages separating
actual timestamp and the GMII bus.
• Bits 0 to 15: Period in fractional nanoseconds
(RX_PERIOD_FNS).
• Bits 16 to 24: Period in nanoseconds (RX_
PERIOD_NS).
• Bits 25 to 31: Not used.
The default value for the period is 0. For 125-
MHz clock, set this register to 8 ns.
RWrx_period0xD3
Configuration Register Space
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IEEE 1588v2 Feature (Dword Offset 0xD0 – 0xD6)
6-16
2014.06.30
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