The MFC ‘handshaking” signal is sent from memory to the CPU when the memory sub-

Question

The MFC ‘handshaking” signal is sent from memory to the CPU when the memory sub-system has finished the requested operation. Why is this signal necessary? Explain with answer.

I. The memory has a variable response time.

II. The RAM may be going through a refresh cycle, and so it is or has been temporarily unavailable

III. If reading, it can serve as a signal that the MDR can be safely clocked and the CPU can receive the data or instruction.

A I, II & III

B I & II

C I only

D II only

E None of the above

Explanation / Answer

D II only

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