Expand the the following question to show the use of the MAR and MBR. You only d

Question

Expand the the following question to show the use of the MAR and MBR. You only do first two steps.

Step 1:

a. The PC contains 300, the address of the first instruction. This value is loaded in to the ______

b. The value in location 300 (which is the instruction with the value 1940 in hexadecimal) is loaded into the______ , and the PC is incremented. These two steps can be done in parallel.

c. The value in the _____  is loaded into the IR.

Step 2:

a. The address portion of the IR (940) is loaded into the _____

b. The value in location 940 is loaded into the ______

c. The value in the ______  is loaded into the AC.

Explanation / Answer

Step 1:

a.

The PC contains 300, the address of the first instruction. This value is loaded in to the MAR.

b.

The value in location 300 (which is the instruction with the value 1940 in hexadecimal) is loaded into the MBR, and the PC is incremented .These twosteps can be done in parallel.

c.

The value in the MBR is loaded into the IR.

Step 2:

a.

The address portion of the IR (940) is loaded into the MAR.

b.

The value in location 940 is loaded into the MBR.

c.

The value in the MBR is loaded into the AC.

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