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XMEGA-USB-Connectivity-Slide5
The maximum packet size using the BULK transfer in USB (Full Speed mode) is 64 Bytes. For some applications, however, this is less than the accepted minimum packet size; this happens to be the case in mass storage applications. Therefore, the larger packet must be split at the host and merged at the receiver, increasing the CPU load involved in the transfer.
PTM Published on: 2011-11-23