M88 Module Data Sheet 1 This document describes the M88 , a member of the Network KEY FEATURES Synchronization Module for packet network timing applications based on the Silicon Labs AccuTime Servo Loop. This docu- Synchronizes to GPS/GNSS, Synchronous Ethernet (SyncE), BITS, ment describes how to design with the M88 sub-system module PTP (IEEE 1588-2008). and how to use it in an embedded application. Its intended audi- Industry-leading IEEE 1588 time & frequency recovery algorithms with phase ence is system architects, who want to understand the functions accuracy better than 1 s per G.8261 of the M88 and how it can be used in various applications, hard- Class C Constant time error generation ware designers who want to integrate the M88 into their design, (cTE) performance per ITU G.8272.2 and software designers who need to write code that should com- Fractional Frequency Offset better than 1ppb under ITU-T G.8261 test conditions municate with the M88 module. Comprehensive IEEE 1588-2008 stack implements ordinary, gateway and The integration section includes the pinout of the module and other physical aspects boundary clock like the options of power supply. It also describes how to connect the necessary key Supports one-step and two-step clock components which are a prerequisite for proper operation. Fully compliant to telecom, power and Silicon Labs recommends anyone who wants to integrate the M88 in their design and default profiles to fully understand its characteristics to purchase the M88EVB evaluation board which This document applies to software release contains the M88 and provides full access to all interfaces and functionality of the 2.0.0 and later. For details of any features module. added since release 2.0.0, see the Release Notes for the relevant version. This document applies to software Release 2.0 of the M88. M88 modules can be upda- ted to Release 2.0 by following the directions in 27. Appendix 8: Firmware Upgrade. Note: 1. There are three M88 variants: M88-32, M88-128, and M88-256. The number refers to the allowed number of slaves. Otherwise, the variants are identical and descri- bed merely as M88 in this document. Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 1 Rev. 0.1 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice July 26, 2021 1Table of Contents 1. General Description.............................7 1.1 Technical Performance and Functions ......................7 1.2 Key Features ..............................8 1.3 Timing References.............................8 1.4 Time and Frequency Outputs.........................8 1.5 RGMII Interfaces .............................9 1.6 Communication Interfaces..........................9 1.7 JSON Machine-to-Machine Communications....................9 1.8 Block Diagram..............................9 2. Applications............................... 10 2.1 Mobile Backhaul Carrier Ethernet........................10 2.2 Macro/Micro eNodeB and Small Cell ......................10 2.3 C-RAN BBU to RRH Sync ..........................10 3. Packaging ................................11 3.1 Dimensions...............................11 3.2 Recommended Land Pattern .........................11 3.3 Soldering and Handling...........................12 3.4 Tape and Reel..............................12 3.4.1 Pad A1 Orientation...........................13 3.4.2 Tape and Reel Specification........................13 4. LED Description ............................. 14 5. Pin List ................................ 15 5.1 Pin Descriptions .............................21 5.1.1 Network Synchronizer..........................21 5.1.2 Time and Frequency ..........................21 5.1.3 RTC................................22 5.1.4 Analog ...............................22 5.1.5 GPIO Serial .............................22 5.1.6 RGMII ...............................22 6. Specifications.............................. 23 6.1 Metrics ................................23 6.2 Absolute Maximum Ratings..........................23 6.3 Recommended Operating Conditions (Preliminary)..................23 6.4 DC Electrical Characteristics (Preliminary).....................24 6.5 AC Electrical Characteristics .........................24 6.6 MTBF.................................25 Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 2 Rev. 0.1 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice July 26, 2021 2