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SRIO 4X模式的PCB布线疑问



1、在对6678中SRIO进行PCB布线时遇到一个疑问。若需要使用SRIO 4X模式时,PCB布线是否有必要对4组TX和RX差分信号分别进行等长处理?

2、若不进行等长处理,4组差分信号的相位差应该控制在多少范围内?

  • 参见"Hardware Design Guide for KeyStone I Devices" (sprabi2)

    Each complementary SRIO SerDes receive pair shall be individually skew
    matched to within 1 pS. 1 pS equates to approximately 5.464 mils to 7.092 mils
    (depending on propagation delays). Example of the SRIO complementary pairs
    include RIORXN0 & RIORXP0.

    All four complementary receive pairs RIORXN/P3:0 shall be assigned and routed
    as an individual net class, routing skew shall not be greater than 15 pS between all
    receive pairs.