描述 Description

The IEEE 1588-2008 Precision Time Protocol (PTP) is a

packet-based synchronization mechanism used in

packet-switched networks. PTP synchronizes the clocks of

different devices with the most accurate clock on the network –

usually a precise, grandmaster clock such as one using a Primary

Reference Time Clock (PRTC) time signal.

The 82P33913-x is a software and hardware system that can

operate as a PTP slave or PTP master. As a PTP slave, the

82P33913-x recovers accurate and stable electrical

synchronization signals from a packet-based reference generated

by a PTP master. As a PTP master, the 82P33913-x can lock to a

stable electrical clock source and generate packet based PTP

references for downstream PTP slaves.

The 82P33913-x is available with the two software options listed

in Table 1.

Table 1. Software Options by Part Number

Part Number Included Software

82P33913 Renesas Clock Recovery Servo Software

82P33913-1 Renesas Clock Recovery Servo Software

IEEE 1588 Protocol Stack

特性 Features

? System implements ITU-T telecom profiles

? Composed of Renesas’ IEEE 1588 software and Renesas’

Synchronization Management Unit (SMU) hardware

? Operates as IEEE 1588 / PTP slave

? Recovers accurate and stable synchronization signals from

packet based IEEE 1588 / PTP master

? Provides integrated physical layer frequency support

? Operates as an IEEE 1588 / PTP master

Software

? C99 source code distribution, supporting POSIX-based

Operating Systems (OSs) such as Linux

? IEEE 1588 compliant Precision Time Protocol (PTP) stack

? Abstraction interface supports user-supplied IEEE 1588

compliant Precision Time Protocol (PTP) stack

? Reference trackers filter packet synchronization noise from

IEEE 1588 unaware networks

Hardware

? Synchronization Management Unit (SMU) provides tools to

manage physical layer and packet based synchronous clocks

for IEEE 1588 Telecom Profile applications

? Supports independent IEEE 1588 and Synchronous Ethernet

(SyncE) timing paths

? Combo mode provides SyncE physical layer frequency support

for IEEE 1588 Telecom Boundary Clocks (T-BC) and Telecom

Time Slave Clocks (T-TSC) per G.8273.2

? Digital PLLs can be configured as Digitally Controlled

Oscillators (DCOs) for IEEE 1588 clock synthesis

? Generates G.8262 and G.8262.1 compliant SyncE clocks

? Fractional-N input dividers support a wide range of reference

frequencies

? Locks to 1 pulse per second (PPS) references from GPS based

sources

? Loads configuration from an external EPROM after reset