(no top-posting, please david preetham <preetham.david@xxxxxxxxx> writes: >> > How device controller will know short packet or end of transfer apart >> from >> > checking req length and received length from host is there anything host >> > informs this is short packet to device controller? Suppose there 2gb file >> > is getting transfer from host to device. How host will make sure EOF or >> > short transfer for complete 2gb file. >> >> Short packet is when a packet is smaller than wMaxPacketSize. Assuming >> we're discussing bulk endpoints with a SS USB link, then wMaxPacketSize >> will be 1024. If you have a file that's exactly 2GiB (2*1024*1024, or >> 2^31), then you don't have a short packet. I'm assuming host would have >> to send a ZLP to signify the end of the transfer. > > In case of ZLP is expected from host does device controller(DMA) has > timeout value? > With in this time ZLP is expected or USB device controller > indefinitely waits for ZLP ? If timeout value is there how much time > it will wait ? no, there are timeouts. -- balbi
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