【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

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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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Silicon Labs（芯科科技） AN947 使用si5340/41/42/44/45/80实现零延迟模式应用笔记

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,SI5344H,SI5342H-C04990-GMR,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

2016年07月15日 - SILICON LABS - 应用笔记或设计指南 - Rev 0.1 代理服务技术支持批量订货

【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。

2019-11-12 - 器件选型代理服务技术支持批量订货

Silicon Labs（芯科科技） Si5341/Si5340片上时钟树系列时钟发生器数据手册

型号- SI5340D,SI5340A-D-GM,SI5341A-D-GM,SI5341A,SI5341-D-EVB,SI5341B,SI5340A,SI5341C,SI5340B,SI5341D-D-GM,SI5341D,SI5340C,SI5340-D-EVB,SI5341B-D-GM,SI5340D-D-GM,SI5340,SI5341C-D-GM,SI5341,SI5340B-D-GM,SI534X,SI5340C-D-GM

2016年10月24日 - SILICON LABS - 数据手册 - Rev. 1.0 代理服务技术支持批量订货