USB之high-speed high-bandwidth endpoint
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USB之high-speed high-bandwidth endpoint
1 high-speed才有high-bandwidth endpoint
2 interrupt 和 isoc才有high-bandwidth endpoint
3 每micro-frame 1、2、3 transactions
4 每micto-frame数据量超过1024 Bytes
5 设备的端点描述符的wMaxPacketSize bit11~12声明每帧transaction数量,称之为mult
6 第一个transaction长度必须为MPS,最后一个transaction长度可以为剩余数据长度。
7 中断传输DATA0、DATA1交替
8 同步传输IN:
总共1包 —— DATA0
总共2包 —— DATA1 - DATA0
总共3包 —— DATA2 - DATA1 - DATA0
9 同步传输OUT:
总共1包 —— DATA0
总共2包 —— MDATA - DATA1
总共3包 —— MDATA - MDATA - DATA2
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