Keysight Technologies(是德科技) Oscilloscope Considerations for Multilane MIPI M-PHY Transmitter Validation
●介绍
■移动工业处理器接口(MIPI)联盟是一个标准机构,促进移动设计中的硬件和软件标准化。这些规范的制定不仅考虑了性能,还考虑了降低功耗的方法,使这些标准成为移动应用的理想选择。高速、低功耗的物理层规范之一是M-PHY规范,它可以灵活地适应不同的协议应用。此外,M-PHY物理层是可伸缩的,其中上游和下游车道实施的数量不受限制。应用程序可以利用这种可扩展性来指定和设计多车道信号,从而在不牺牲能耗的情况下利用数据速率性能。DigRF v4、低延迟接口(LLI)、通用闪存(UFS)、摄像头串行接口(CSI)、显示串行接口(DSI)和超高速USB芯片间接口(SSIC)等协议已经采用了M-PHY物理层。
M-PHY支持两种不同的速度模式,即高速(HS)和低速(LS)。显然,当必须传输大量数据时,使用HS模式,其中LS模式主要用于设备控制和配置。在每种模式中,也有不同的数据速率,也称为gears。在HS模式下,Gear 1发布了官方M-PHY规范,最大数据速率约为1.5 Gbps。目前的路线图包括将速度提高到2档和3档的计划,最高速度分别约为3 Gbps和6 Gbps。虽然不是官方的,但已经有计划将数据速率进一步推至12 Gbps的Gear 4。随着这种增长趋势,M-PHY设计的验证任务只会变得更具挑战性。
在当今的移动设计中,许多组件必须被压缩到一个狭小的空间中。电源传输、散热、信号串扰和耦合等设计考虑因素变得更加突出。此外,安装在这个密闭空间中的数字和射频电路将促进电磁干扰(EMI)。MIPI联盟根据一致性测试套件(CTS)对设计进行测试,CTS是发射器和接收器电路的测试要求。其目的是增加系统互操作性的机会,或者保证不同供应商的设计在一起使用时能够很好地工作。在这些高速、多车道的M-PHY设计中,精确验证设计的挑战变得越来越困难。为了帮助改进电气验证,在选择示波器验证多通道M-PHY设计时,有几个注意事项
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