JAJSC33G February 2015 – October 2022 DP83867CR , DP83867IR
PRODUCTION DATA
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When the DP83867 is operating in 1000-Mb slave mode, the variation of the RX_SFD pulse can be determined using the Skew FIFO Status register (register address 0x0055) bit[3:0].The value read from the Skew FIFO Status register bit[3:0] should be multiplied by 8ns to estimate the RX_SFD variation added to the baseline latency.
Example: While operating in slave 1000-Mb mode, a value of 0x1 is read from the Skew FIFO register bit[3:0].
1 × 8 ns = 8 ns is subtracted from the TX_SFD to RX_SFD measurement to determine the baseline latency.