i.MX6D - DDR差分时钟终端电阻

[jcteng]

         在i.MX6D的参考设计中，DDR的差分时钟要求要有终端电阻200Ω，如图片中R118和R43。请问这个终端电阻的作用是什么？如果不加这个终端电阻，可能会有什么风险？谢谢！

[igorpadykov]

Hi jcteng

these resistors are used for decreasing signal reflections and improving

signal shape.

Best regards
igor
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