USB 2.0 also added a larger three-byte SPLIT token with a seven-bit hub number, 12 bits of control flags, and a five-bit CRC. This is used to perform split transactions. Rather than tie up the high-bandwidth USB bus sending data to a slower USB device, the nearest high-bandwidth capable hub receives a SPLIT token followed by one or two USB packets at high bandwidth, performs the data transfer at full or low bandwidth, and provides the response at high bandwidth when prompted by a second SPLIT token.
ఏడు-బిట్ హబ్ సంఖ్యతో ఒక పెద్ద మూడు-బైట్ SPLIT టోకెన్, 12-బిట్ నియంత్రణ జెండాలు, మరియు ఐదు-బిట్ CRC ఏమి చేయడానికి సృష్టించబడ్డాయి?
to perform split transactions