PDIUSBD12 has 6 endpoints, 2 control endpoints, 2 Generic endpoints and 2 Main endpoints.The Main endpoints support DMA transfer.In the protocol based DMA operation, the host application first ask the device’s firmware to setup DMA transfer using vendor request which is sent through control endpoint, then it performs actual bulk data transfer on the Main endpoints. After the setup of DMA controller, the host can transfer up to 64K bytes of data to the device without any firmware intervention.
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