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Category > Computer Science Posted 28 Jul 2017 My Price 5.00

LDR DR, BaseR, offset.

The LC-3 ISA contains the instruction LDR DR, BaseR, offset. After the instruction is decoded, the following operations (called microinstructions) are carried out to complete the processing of the LDR instruction:

Suppose that the architect of the LC-3 wanted to include an instruction MOVE DR, SR that would copy the memory location with address given by SR and store it into the memory location whose address is in DR.

a. The MOVE instruction is not really necessary since it can be accomplished with a sequence of existing LC-3 instructions. What sequence of existing LC-3 instructions implements (also called "emulates") MOVE R0,R1?

b. If the MOVE instruction were added to the LC-3 ISA, what sequence of microinstructions, following the decode operation, would emulate MOVE DR,SR?

 

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Maurice Tutor
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Status NEW Posted 28 Jul 2017 01:07 PM My Price 5.00

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