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This protocol provides methods to permit handshaking between peripherals and the DMA controller.
Passes requests from a peripheral to the DMA controller. The request is a bitfield with the low four bits defined. The request is level sensitive and latched internally by the DMA controller. It is sampled and interpreted in a manner dependent on the target channel and configured flow control.
Burst transfer request.
Passes responses from the DMA controller to peripherals. The response is a bitfield with the low two bits defined. The response is transient rather than level sensitive.
Terminal count response.