Universal serial bus controller with a direct memory access mode

作者： Bruce A. Loyer , Allen B. Thor , Daniel B. Reents

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摘要: A universal serial bus (USB) device or host provides a controller with direct memory access (DMA) mode. In DMA mode, transmit endpoint may be programmed for channel, receive channel. For USB device, channel performs data transfer to host, and handles from the host. device. protocol mode of permit maximum packet size value greater than physical buffer endpoint. thus allows significant reduction in buffer. having as fast can request data.

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