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请教ISP1161A的同步传输问题
我看datasheet感觉ISO模式下PSOF、SOF、Endpoint三个中断的关系很模糊,特别是提到 If a Start-Of-Frame is lost, PSOF interrupts are generated every 1 ms. This allows the firmware to keep data transfer synchronized with the host.
After 3 missed SOF events, the DC will enter ‘suspend’ state.感觉PSOD的条件是什么SOF is lost,什么意思?还有SOF Miss 三次,就挂起,什么意思阿??? |
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沙发#
发布于:2003-09-15 11:32
我也是用ISP1161的,你那个datasheet是USB协议吗sof就是代表每一帧的开始啊,同步传输就是考sof同步的嘛,如果sof都掉了那就没法同步了呗!设备只有进入挂起状态!
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