SNLS779A July 2025 – November 2025 DP83TC815-Q1
PRODUCTION DATA
The IEEE802.1AS/1588v2 receive parser monitors receive packet data to detect IEEE1588 Version 1 and Version 2 Event messages. The receive parser can detect PTP Event messages transported directly in Ethernet packets. Upon detection of a PTP Event message, the device captures the receive timestamp and provide the timestamp value to host (MAC). In addition to the timestamp, the device records the 16-bit SequenceId, the 4-bit messageType field, and generate a 12-bit hash value for octets 20-29 of the PTP event message. The device can buffer four timestamps.
If enabled, an interrupt is generated upon a Receive Timestamp Ready.
Receive Timestamp Insertion:
The DP83TC815-Q1 can deliver the timestamp to host (MAC) by inserting the timestamp in the received packet. This allows for a simple method to deliver the packet to software without having to match the timestamp to the correct packet. This also eliminates the need to read the receive timestamp through the Serial Management Interface.