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请问下在设计PCB时，DDR等长需要怎么设计呢，所谓的等长又该怎么做呢，比如32位的DDR总线接口，数据线可以分四组等长，控制线作为一组等长吗，不同组之间长度差应该控制在多少范围类呢？请问有相关参考文档吗，搜索了下，没找到官方文档
请问用的是哪款器件？
你好 我用的AM5728
请参考数据手册里DDR3的布线要求。8.2 DDR3 Board Design and Layout Guidelineshttp://www.ti.com/lit/ds/symlink/am5728.pdf
