Two control signals in microprocessor which are related to Direct Memory…
2011
Two control signals in microprocessor which are related to Direct Memory Access (DMA) are
- A.
INTR & INTA
- B.
RD & WR
- C.
S0 & S1
- D.
HOLD & HLDA
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Correct answer: D
Direct Memory Access (DMA) allows peripheral devices to transfer data directly to memory without CPU intervention. To achieve this, the DMA controller asserts the HOLD signal to request control of the system bus. The microprocessor responds by asserting the HLDA (Hold Acknowledge) signal, indicating it has relinquished bus control. Therefore, HOLD and HLDA are the specific control signals associated with DMA operations.