SNLS504E October 2015 – May 2024 DP83867CS , DP83867E , DP83867IS
PRODUCTION DATA
The DP83867 supports an IEEE 1588 indication pulse at the SFD (start frame delimiter) for the receive and transmit paths. The pulse can be delivered to various pins. The pulse indicates the actual time the symbol is presented on the lines (for transmit), or the first symbol received (for receive). We are adjusting baseline latency to help with SFD variation. The baseline latency can be adjusted through register. Each increment of phase value is an 8ns step.
The SFD pulse output can be configured using the GPIO Mux Control registers, GPIO_MUX_CTRL1 (register address 0x0171) and GPIO_MUX_CTRL2 (register address 0x0172). The ENHANCED_MAC_SUPPORT bit in RXCFG (register address 0x0134) must also be set to allow output of the SFD.
For more information about configuring the DP83867's SFD feature, see the How to Configure DP83867 Start of Frame application report (SNLA242).