Answer Posted / niaz mohammad
DMA (Direct Memory Access) is a technique that transfers
data between a microprocessor's memory and an I/O device
without involving the microprocessor.
* Working process of DMA controller:
1. The I/O device request DMA operation via the DMA request
lines of the controller chip.
2. The controller chip activates the microprocessor HOLD
pin, requesting the CPU to release the bus.
3. The processor then sends HLDA (Hold Acknowledgement) back
to the DMA controller.
4. The DMA controller completes the DMA transfer and
releases the bus.
Is This Answer Correct ? | 14 Yes | 0 No |
Post New Answer View All Answers
What is baud rate?
What are hardware interrupts?
Why stack is used in program?
Differentiate between div and idiv instructions with the help of examples.
What are the different types of memory addressing modes?
What are the functions of base registers?
How many hardware interrupts 8085 supports?
Which is the stack used in 8085?
explain the different types of control flags for the 8086?
Does alu have any storage facility?
Which register handles the arithmetic operations in the 8085?
Define macros with the help of an example.
What is special function registers (sfr)?
Explain what is the main difference between 8085 and 8086 processors?
Explain what type of architecture is used in 8085 microprocessor?