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PHYAD3 Datasheet(PDF) 8 Page - Texas Instruments |
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PHYAD3 Datasheet(HTML) 8 Page - Texas Instruments |
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8 / 135 page  DP83630 SNLS335B – OCTOBER 2010 – REVISED APRIL 2013 www.ti.com 2.3.2 PACKET TIMESTAMPS 2.3.2.1 IEEE 1588 Transmit Packet Parser and Timestamp The IEEE 1588 transmit parser monitors transmit packet data to detect IEEE 1588 Version 1 and Version 2 Event messages. The transmit parser can detect PTP Event messages transported directly in Layer2 Ethernet packets as well as in UDP/IPv4 and UDP/IPv6 packets. Upon detection of a PTP Event Message, the device will capture the transmit timestamp and provide it to software. Since software knows the order of packet transmission, only the timestamp is recorded (there is no need to record sequence number or other information). The device can buffer four timestamps. If enabled, an interrupt may be generated upon a Transmit Timestamp Ready. 2.3.2.1.1 One-Step Operation In some cases, the transmitter can be set to operate in a One-Step mode. For Sync Messages, a One- Step device can automatically insert timestamp information in the outgoing packet. This eliminates the need for software to read the timestamp and send a follow up message. 2.3.2.2 IEEE 1588 Receive Packet Parser and Timestamp The IEEE 1588 receive parser monitors receive packet data to detect IEEE 1588 Version 1 and Version 2 Event messages. The receive parser can detect PTP Event messages transported directly in Ethernet packets as well as in UDP/IPv4 and UDP/IPv6 packets. Upon detection of a PTP Event message, the device will capture the receive timestamp and provide the timestamp value to software. In addition to the timestamp, the device will record 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. An interrupt will be generated, if enabled, upon a Receive Timestamp Ready. 2.3.2.2.1 Receive Timestamp Insertion The DP83630 can deliver the timestamp to software 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. 2.3.2.3 NTP Packet Timestamp The DP83630 may be programmed to timestamp NTP packets instead of PTP packets. This operation is enabled by setting the NTP_TS_EN control in the PTP_TXCFG0 register. When configured for NTP timestamps, the DP83630 will timestamp packets with the NTP UDP port number rather than the PTP port number (note that the device cannot be configured to timestamp both PTP and NTP packets). One-Step operation is not supported for NTP timestamps, so transmit timestamps cannot be inserted directly into outgoing NTP packets. Timestamp insertion is available for receive timestamps but must use a single, fixed location. 2.3.3 EVENT TRIGGERING AND TIMESTAMPING 2.3.3.1 IEEE 1588 Event Triggering The DP83630 is capable of being programmed to generate a trigger signal on an output pin based on the IEEE 1588 time value. Each trigger can be programmed to generate a one-time rising or falling edge, a single pulse of programmable width, or a periodic signal. For each trigger, the microcontroller specifies the desired GPIO and time that the activity is to occur. The trigger is generated when the internal IEEE 1588 clock matches the desired activation time. 8 Device Information Copyright © 2010–2013, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: DP83630 |
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