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MAX96855串行器在DP MST input时自行toggle HPD并降低link rate capability

Category: Software
Product Number: max96855, max968

MAX98855在DP MST input时,HBR3的DP training已经pass,但随后发现其HPD toggle约280ms,同时主动切换其link rate capability从HBR3到HBR2,会是什么原因造成?

是link在train pass后symbol error较大,串行器会自行toggle HPD并降低link rate吗?还是在train pass后,串行器的MST RX对收到MST stream有时间要求,一段时间内无stream allocate便会主动降档?