【经验】使用CBPro配置超低抖动时钟发生器SI5341B-D-GM时ZDM导致配置失败如何解决？

时间： 2021-02-02 来源：世强

技术问答

SI5341B-D-GM是SILICON LABS一款经典的超低抖动时钟发生器，虽不具有消抖功能，但具备90 fs的RMS jitter性能，媲美一般的高性能消抖时钟发生器，因此在高端仪器、通信设备等领域可作为主时钟源来设计。SI5341B-D-GM使用CBPro软件进行频率计划的配置，且支持ZDM零延时功能。

日前，有用户在使用CBPro软件配置SI5341B-D-GM时，碰到了一则ZDM零延时配置引起的配置问题。当打开工程显示“Errors: error running post frequency plan calculation tasks (step 1); frequency plan not realizable”，CBPro导入工程初始化失败。进一步分析，发现客户使用了ZDM功能，很可能是因为ZDM配置导致的问题。继续扫描步骤，发现使用了Crystal作为输入（如下图1），首先这个crystal模式配置在这里是错误的，因为在ZDM功能使用时，不能使用Crystal模式作为输入源，不论这个模式输入多少MHz。

图1 CBPro输入模式配置

关闭Crystal模式输入后，又出现新的错误“Errors: There are no outputs other than ZDM feedback OUT9 that are assigned to N0 divider; therefore none of your outputs will be zero delay”，这个错误提示了该设计违背CBPro的ZDM设计的一个规范，从OUT9反馈回路给FB_IN输入端的ZDM频点，如果与其他输出的频点存在公倍数关系，这些输出的其中一路对应的分频器必须手动的改成N0（ZDM指定的分频器）。从工程中发现有三路输出的频点与ZDM反馈的100MHz频点存在整数倍关系，修改了其中一路输出分频器为N0后，问题彻底解决。

上面这些错误毕竟违背了CBPro的设计规范，必须要改正，否则工程无法继续配置，但是改正措施同时修改了设计的输入的配置（去掉了crystal模式），需要工程师重新评估。

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产品变更通知及停产信息 - SILICON LABS - 2020年3月17日 PDF 英文下载

Silicon Labs（芯科科技） AN922 对于Si5346/ 47频率使用命令行界面(CLI) 应用笔记

型号- SI5345A-B-GM,SI5340A-D-GMR,SI5341A-D-GMR,SI5347D-B-GM,SI5344C-B-GM,SI5341B-B04918-GMR,SI5347A-D-GM,SI5345D-B03700-GM,SI5345B-B04564-GM,SI5345D-D-GM,SI5346A-D-GMR,SI5348A-B-GMR,SI5347A-D-GMR,SI5380,SI5345D-B04831-GM,SI5346A-B-GMR,SI5344D-B-GM,SI5342D-B05470-GM,SI5341C-B-GM,SI5345A,SI5345B,SI5345C,SI5345B-B05955-GM,SI5345D,SI5342D-D-GM,SI5341B-B04187-GMR,SI5341A-B-GM,SI5347D-B-GMR,SI5380-A-ZXM,SI5345D-B04501-GM,SI534XH,SI5356B-B00322-GMR,SI5341D-B-GM,SI5341A-B-GMR,SI5345D-B04409-GM,SI5347C-B-GM,SI5344A-B-GM,SI5341D-D-GMR,SI5340C-B-GMR,SI5342C-D-GM,SI5345B-B00021-GM,SI5345B-B06003-GM,SI5346B,SI5341B-B05197-GMR,SI5347B-D-GM,SI5344B-D-GM,SI5345C-D-GM,SI5347D-D-GMR,SI5345B-B-GMR,SI5346A,SI5346B-B-GMR,SI5345D-B04493-GM,SI5345D-B04502-GM,SI5347A-B-GM,SI5341B-B05496-GM,SI5345D-B05784-GM,SI5341B-D-GM,SI5340B-B-GM,SI5340D-B-GMR,SI5341C-D-GM,SI538X,SI5345A-D-GM,SI5340C-D-GMR,SI5345B-B04421-GM,SI5348B-B05017-GM,SI5347C-D-GMR,SI5346B-B-GM,SI5342D-B-GM,SI5380-D-EVB,SI5342H-C04990-GMR,SI5344H,SI5345C-B-GM,SI5344D,SI5345B-B05825-GM,SI5342B-D-GM,SI5342D-B04694-GM,SI5344D-D-GM,SI5345A-B04957-GM,SI5344A-D-GM,SI5347C-D-GM,SI5345D-B04830-GM,SI5347A-A-GMR,SI5344B-A-GMR,SI5347B-D-GMR,SI5342D-B03814-GM,SI5345B-B03718-GM,SI5344A,SI5344B,SI5340C-D-GM,SI5345B-B03234-GM,SI5344C,SI5347B-B-GM,SI5347C-B-GMR,SI5340D-D-GMR,SI5341B-B-GM,SI5340A-D-GM,SI5341A,SI5341B,SI5341C,SI5341D,SI5345D-B04500-GM,SI5344B-B04184-GM,SI5341B-B05609-GMR,SI5340B-B-GMR,SI5341B-B-GMR,SI5341B-B04226-GMR,SI5345C-A-GM,SI5340D-B-GM,SI5345B-B-GM,SI5344D-B-GMR,SI5345B-B04881-GM,SI5346B-D-GM,SI5340B-D-GM,SI5345A-B-GMR,SI5342A-B-GM,SI5345B-B05785-GM,SI5345D-B05731-GM,SI5340B-D-GMR,SI5342H,SI5345A-A-GM,SI5345B-B05747-GM,SI5342B,SI5348B-B05856-GM,SI5342C,SI5342D,SI5342H-C04990-GM,SI5342B-B-GM,SI5347B-B-GMR,SI5348B-B05083-GM,SI5346B-D-GMR,SI5345B-B04823-GM,SI5345B-B05971-GM,SI5340C-B-GM,SI5348B-B05423-GM,SI5342A,SI5346A-D-GM,SI5340A-B-GM,SI5345D-B-GM,SI5346B-A-GMR,SI5348A-A-GM,SI5341B-B04964-GMR,SI5340D-D-GM,SI5342C-A-GMR,SI5345B-D-GM,SI5342A-D-GM,SI5347C,SI5341C-D-GMR,SI5347D,SI534X,SI5341B-A04048-GMR,SI5345A-B04313-GM,SI5341D-B-GMR,SI5345B-B04408-GM,SI5347D-D-GM,SI5347A,SI5347B,SI5340D,SI5345D-B04494-GM,SI5345D-B04528-GM,SI5341A-D-GM,SI5347A-B-GMR,SI5340A,SI5340B,SI5340C,SI5341D-D-GM,SI5348A-D-GM,SI5345D-B04834-GM,SI5345B-B04563-GM,SI5341B-D-GMR,SI5345A-B04313-GMR,SI5340A-B-GMR,SI5345D-B05729-GM,SI5345D-B04410-GM,SI5341C-B-GMR,SI5345A-A-GMR,SI5342H-D04990-GMR,SI5348A,SI5345B-B05786-GM,SI5346A-B-GM

应用笔记或设计指南 - SILICON LABS - Rev 0.1 - 2016年07月15日 PDF 英文下载

【产品】四路独立DSPLL超低抖动衰减器，简化设计复杂度

针对Si5347-B版本实际应用过程中碰到的Bug和客户提出的应用需求，Silicon Labs最新推出了一款可用于在8kHz~750MHz输入时钟抖动衰减时钟发生器Si5347-D，其实用的可编程延时调节、精准的缓变率调节及可配置的自由振荡模式等功能大大简化了系统设计的复杂度。

新产品发布时间 : 2019-07-04

【选型】无线时钟发生器SI5386A-E-GM可以完美替换AD9528，同时支持整数和小数分频

Siliocn Labs推出的一款高性能、超低抖动无线时钟发生器SI5386A-E-GM，是其中一款非常优秀的无线去抖时钟，支持12路时钟输出，且支持输入4路输入，且支持5个时钟域，典型的抖动值可以限制在72fs左右，且最高可达3Ghz的频率输出，在5G小基站的应用中十分优秀，与另一款无线时钟AD9528相比，其性能优势非常明显。

器件选型发布时间 : 2019-11-12

Silicon Labs（芯科科技） ClockBuilder Pro开发套件使用说明

型号- SI5345A-B-GM,SI5340A-D-GMR,SI5341A-D-GMR,SI5347D-B-GM,SI5344C-B-GM,SI5341B-B04918-GMR,SI5347A-D-GM,SI5345D-B03700-GM,SI5345B-B04564-GM,SI5345D-D-GM,SI5346A-D-GMR,SI5348A-B-GMR,SI5347A-D-GMR,SI5380,SI5345D-B04831-GM,SI5346A-B-GMR,SI51214-A01AFM,SI5344D-B-GM,SI5342D-B05470-GM,SI5341C-B-GM,SI5345A,SI5345B,SI5345C,SI5345B-B05955-GM,SI5345D,SI5342D-D-GM,SI5341B-B04187-GMR,SI5341A-B-GM,SI5347D-B-GMR,SI5380-A-ZXM,SI5345D-B04501-GM,SI5356B-B00322-GMR,SI5341D-B-GM,SI51210,SI5341A-B-GMR,SI51211-A01AFM,SI5345D-B04409-GM,SI5347C-B-GM,SI51210-A01AFMR,SI5344A-B-GM,SI5341D-D-GMR,SI5340C-B-GMR,SI5342C-D-GM,SI5345B-B00021-GM,SI5345B-B06003-GM,SI5346B,SI5341B-B05197-GMR,SI5347B-D-GM,SI5344B-D-GM,SI5345C-D-GM,SI5347D-D-GMR,SI5345B-B-GMR,SI5346A,SI5346B-B-GMR,SI5345D-B04493-GM,SI5345D-B04502-GM,SI5347A-B-GM,SI5341B-B05496-GM,SI5345D-B05784-GM,SI5341B-D-GM,SI5340B-B-GM,SI5340D-B-GMR,SI5341C-D-GM,SI538X,SI5345A-D-GM,SI5340C-D-GMR,SI5345B-B04421-GM,SI5348B-B05017-GM,SI5347C-D-GMR,SI5346B-B-GM,SI5342D-B-GM,SI5380-D-EVB,SI5345C-B-GM,SI5344D,SI5345B-B05825-GM,SI5342B-D-GM,SI5342D-B04694-GM,SI5344D-D-GM,SI5345A-B04957-GM,SI5344A-D-GM,SI5347C-D-GM,SI5345D-B04830-GM,SI5347A-A-GMR,SI5344B-A-GMR,SI5347B-D-GMR,SI5342D-B03814-GM,SI5345B-B03718-GM,SI51218-A01AFMR,SI5344A,SI5344B,SI5340C-D-GM,SI5345B-B03234-GM,SI5344C,SI5347B-B-GM,SI5347C-B-GMR,SI5340D-D-GMR,SI5341B-B-GM,SI5340A-D-GM,SI5341A,SI5341B,SI5341C,SI5341D,SI5345D-B04500-GM,SI5344B-B04184-GM,SI5341B-B05609-GMR,SI5340B-B-GMR,SI5341B-B-GMR,SI5341B-B04226-GMR,SI5345C-A-GM,SI5340D-B-GM,SI5345B-B-GM,SI5344D-B-GMR,SI5345B-B04881-GM,SI5346B-D-GM,SI5121X,SI5340B-D-GM,SI5345A-B-GMR,SI5342A-B-GM,SI5345B-B05785-GM,SI5345D-B05731-GM,SI5340B-D-GMR,SI5345A-A-GM,SI5345B-B05747-GM,SI5342B,SI5348B-B05856-GM,SI5342C,SI5342D,SI5342B-B-GM,SI5347B-B-GMR,SI5348B-B05083-GM,SI5346B-D-GMR,SI5345B-B04823-GM,SI5345B-B05971-GM,SI5340C-B-GM,SI5348B-B05423-GM,SI5342A,SI5346A-D-GM,SI5340A-B-GM,SI5345D-B-GM,SI5346B-A-GMR,SI5348A-A-GM,SI5341B-B04964-GMR,SI5340D-D-GM,SI51214,SI5342C-A-GMR,SI5345B-D-GM,SI51211,SI51218,SI5342A-D-GM,SI5347C,SI5341C-D-GMR,SI5347D,SI534X,SI5341B-A04048-GMR,SI5345A-B04313-GM,SI5341D-B-GMR,SI5345B-B04408-GM,SI5347D-D-GM,SI5347A,SI5347B,SI5340D,SI5345D-B04494-GM,SI5345D-B04528-GM,SI5341A-D-GM,SI5347A-B-GMR,SI5340A,SI5340B,SI5340C,SI5341D-D-GM,SI51210-A01AFM,SI5348A-D-GM,SI5345D-B04834-GM,SI5345B-B04563-GM,SI5341B-D-GMR,SI5345A-B04313-GMR,SI5340A-B-GMR,SI5345D-B05729-GM,SI5345D-B04410-GM,SI5341C-B-GMR,SI5345A-A-GMR,SI5348A,SI5345B-B05786-GM,SI5346A-B-GM

评估板使用说明 - SILICON LABS - Version 2.9 - 2016年07月29日 PDF 英文下载