| 摘要 |
A method of transferring bulk and control data from a first device to a second device over a USB bus comprises storing transfer descriptors, each including a transfer descriptor header and payload data, in a buffer memory in the first device. The data is read in packets for transfer to the second device, with packets being read from the transfer descriptors cyclically. When the first and second transfer descriptor headers, in first and second transfer descriptors respectively, define a common endpoint, data packets are read from only the first transfer descriptor, until such time as it is detected that all data packets from the first transfer descriptor have been transmitted, and thereafter data packets are read from the second transfer descriptor.
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