Dear all: In section 4.5 of ehci-r10.pdf, there is a phase which says "The one micro-frame delay yields host controller periodic schedule and bus frame boundary relationship as illustrated in Figure 4-7. This adjustment allows software to trivially schedule the periodic start and complete-split transactions for full and low-speed periodic endpoints, using the natural alignment of the periodic schedule interface" I know it tries to explain why FRINDEX is one ahead of SOF number. But I cannot feel the trivialness which mentions in driver source, could someone tell me why it tries to do so? Thanks for your help, vichy
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