DMA Controller Registers

The Direct Memory Access (DMA) controller is a hardware device that allows data to be transferred between peripheral devices and memory without the involvement of the microprocessor. The DMA controller has several registers that are used to control and manage the data transfer process. The registers are:

1. Control Register
The control register is used to enable or disable the DMA controller and to select the DMA transfer mode. It also contains status bits that indicate the status of the DMA transfer.

2. Status Register
The status register is used to indicate the status of the DMA transfer. It contains status bits that indicate whether the DMA transfer is in progress, whether an error has occurred, and whether the transfer has been completed successfully.

3. Address Register
The address register is used to store the starting address of the data transfer. It contains the address of the source or destination of the data transfer.

4. Count Register
The count register is used to store the number of data bytes to be transferred. It contains the number of bytes to be transferred from the source or to the destination.

Conclusion
In conclusion, the DMA controller has 3 registers that are necessary to control and manage the data transfer process: Control Register, Status Register, Address Register and Count Register. The control and status registers are single registers, while the address and count registers are double registers.