[amp_mcq option1=”HALT” option2=”RESET” option3=”MREQ” option4=”IORQ” correct=”option3″]
The correct answer is C. MREQ.
MREQ stands for Memory Request. It is a signal that is used to indicate that the processor is requesting access to memory. This signal is used to differentiate between a normal memory cycle and a special memory cycle, such as a cache miss or a DMA transfer.
HALT is a signal that is used to stop the processor. When HALT is asserted, the processor will stop executing instructions and will wait for the HALT signal to be deasserted.
RESET is a signal that is used to reset the processor. When RESET is asserted, the processor will reset its internal state and will start executing instructions from address 0.
IORQ stands for Input/Output Request. It is a signal that is used to indicate that the processor is requesting access to an I/O device. This signal is used to differentiate between a normal memory cycle and an I/O cycle.