Microchip VSC8257 Manual de Usario

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ENT-AN1051

Applicaon Programming Guide

IEEE 1588 in PHY API

Preliminary

December, 2018

Revision History

Details of ChangeRevision

Date

Revision

Revision 1.0 was published in July 2018. It was the rst publicaon of this document.July 20181

2ENT-AN1051 Applicaon Programming Guide Revision 1.0

Contents

1 Introducon.................................................................................................................................7

2 Overview......................................................................................................................................8

2.1 CPU Interface................................................................................................................................................9

2.2 Analyzer........................................................................................................................................................9

2.3 Timestamp....................................................................................................................................................9

2.4 Rewriter........................................................................................................................................................9

2.5 Timestamp FIFO............................................................................................................................................9

2.6 Local Time Counter.......................................................................................................................................9

2.7 API Overview.................................................................................................................................................9

2.8 Limitaons..................................................................................................................................................10

3 Programming the Timestamp Block...........................................................................................11

3.1 Timestamp Block Conguraon..................................................................................................................11

3.1.1 Inializaon..................................................................................................................................11

3.1.2 Enabling/Disabling the 1588 Macro.............................................................................................12

3.2 Programming the Analyzer Unit..................................................................................................................12

3.2.1 Engine Inializaon......................................................................................................................14

3.2.2 Programming the Comparators/Flow of the Engine.....................................................................15

3.2.3 Programming the Engine Acon...................................................................................................16

3.2.4 Programming the Frame Signature Builder..................................................................................16

3.3 Programming the Timestamp Unit.............................................................................................................17

3.3.1 Local Latency................................................................................................................................17

3.3.1.1 Ingress Latency...............................................................................................................17

3.3.1.2 Egress Latency................................................................................................................17

3.3.2 Path Delay.....................................................................................................................................17

3.3.3 Delay Asymmetry..........................................................................................................................18

3.4 Programming the LTC Unit..........................................................................................................................18

3.4.1 PTP Time.......................................................................................................................................18

3.4.2 Local Clock Increment/Decrement...............................................................................................19

3.4.3 Adjust Local Clock Frequency.......................................................................................................19

3.5 Programming the TX-Timestamp FIFO........................................................................................................19

3.5.1 Tx TSFIFO Interface Conguraon................................................................................................19

3.6 Interrupt Handling......................................................................................................................................20

3.7 Stascs Handling.......................................................................................................................................20

4 1588v2 (PTP) Applicaons.........................................................................................................22

4.1 One-step Boundary Clock/Ordinary Clock..................................................................................................22

4.1.1 Ingress..........................................................................................................................................22

4.1.1.1 Inialize an Analyzer Ingress Engine...............................................................................22

4.1.1.2 Congure Flows for Ingress Engine................................................................................23

4.1.1.3 Congure Acon for Ingress Engine...............................................................................23

4.1.2 Egress............................................................................................................................................24

4.1.2.1 Inialize an Analyzer Egress Engine................................................................................24

4.1.2.2 Congure PTP Egress Engine..........................................................................................24

4.1.2.3 Congure Acon for Egress Engine................................................................................24

4.1.3 Events and Acons........................................................................................................................24

4.2 One-step Peer-to-Peer Transparent Clock..................................................................................................25

3ENT-AN1051 Applicaon Programming Guide Revision 1.0