Ieee 1588-2008 Advanced Timestamps - Altera cyclone V Technical Reference

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IEEE 1588-2008 Advanced Timestamps

Mode
1000-Mbps half duplex
operation
Related Information
IEEE Standards Association
For details about jam patterns, refer to the IEEE Std 802.3 2008 Part 3: Carrier sense multiple access with
Collision Detection (CSMA/CD) Access Method and Physical Layer Specifications, available on the IEEE
Standards Association website.
IEEE 1588-2008 Advanced Timestamps
In addition to the basic timestamp features mentioned in IEEE 1588-2002 Timestamps, the EMAC
supports the following advanced timestamp features defined in the IEEE 1588-2008 standard.
• Supports the IEEE 1588-2008 (version 2) timestamp format.
• Provides an option to take a timestamp of all frames or only PTP-type frames.
• Provides an option to take a timestamp of event messages only.
• Provides an option to take the timestamp based on the clock type: ordinary, boundary, end-to-end, or
peer-to-peer.
• Provides an option to configure the EMAC to be a master or slave for ordinary and boundary clock.
• Identifies the PTP message type, version, and PTP payload in frames sent directly over Ethernet and
sends the status.
• Provides an option to measure sub-second time in digital or binary format.
Related Information
IEEE Standards Association
For more information about advanced timestamp features, refer to the IEEE Standard 1588 - 2008 IEEE
Standard for a Precision Clock Synchronization Protocol for Networked Measurement and Control System,
available on the IEEE Standards Association website.
Peer-to-Peer PTP Transparent Clock (P2P TC) Message Support
The IEEE 1588-2008 version supports Peer-to-Peer PTP (Pdelay) messages in addition to SYNC, Delay
Request, Follow-up, and Delay Response messages.
Clock Types
The EMAC supports the following clock types defined in the IEEE 1588-2008 standard:
• Ordinary clock
• Boundary clock
• End-to-End transparent clock
• Peer-to-Peer transparent clock
Altera Corporation
Minimum Gap Between Two SFDs
24 GMII clocks
(4 for a jam pattern sent just after SFD
because of collision + 12 IFG + 8
preamble)
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Minimum PTP Frequency
(3 * PTP) + 4 * GMII <= 24 * GMII,
that is, 18.75 MHz
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2016.10.28
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Ethernet Media Access Controller
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