DMA asserts _____ signal to 'low' at the end of data transfer to inform the peripheral that the data transfer is complete.

Question

Question

This question was previously asked in

RRB JE CBT 2 (Electronics Engineering) ReExam Official Paper (Held On: 04 Jun, 2025)

Answer 1

The correct answer is 2) EOP (End of Process).

EOP (End of Process) is a signal asserted by the DMA controller to indicate the completion of a data transfer. It is driven low to inform the peripheral device that the transfer has finished.
This signal is critical for synchronizing DMA operations, allowing the peripheral to release control of the bus or prepare for the next action.

HRQ (Hold Request): Asserted by the peripheral to the DMA controller to request control of the bus (not to signal completion).
HLDA (Hold Acknowledge): Sent by the CPU to the DMA controller to grant bus control (peripheral is not directly informed).
DRQ (DMA Request): Used by the peripheral to initiate a DMA transfer (not to signal its end).