DMA Controller Group Register Descriptions Registers used by the DMA Controller to enable secured system support and select DMA channels. Offset: 0x70 ctrl Registers used by the DMA Controller. All fields are reset by a cold or warm reset. These register bits should be updated during system initialization prior to removing the DMA controller from reset. They may not be changed dynamically during DMA operation. persecurity Controls the security state of a peripheral request interface. Sampled by the DMA controller when it exits from reset. These register bits should be updated during system initialization prior to removing the DMA controller from reset. They may not be changed dynamically during DMA operation.