Hard wired and indirect addressing – Computer System Architecture

Question 1 UGC NET June-2020    
Given below are two statements:
Statement I: hardwired control unit can be optimized to produce fast mode of operation.
Statement II: Indirect addressing mode needs two memory references to fetch the operand.
In the light of the above statements, choose the correct answers from the options given below.
A – Both Statement I and Statement II are true
B – Both Statement I and Statement II are false
C – Statement I is correct but Statement II is false
D – Statement I is incorrect but Statement II is true

Show Answer With Best Explanation

Answer – A
Explanation:
Statement I: hardwired control unit can be optimized to produce fast modes of operations.
hardwired control unit can be uses a large number of registers and because of that it is costly.
hardwired control unit Instruction size in the Hardwired unit is fixed.
hardwired control unit has a small number of addressing modes.
Statement II: In indirect addressing mode, instructions contain the address of an operand where operand is actually present. It requires two memory access to fetch the operand.
Example:
LOAD R1, @300


The address part of an instruction contains 300. Now the control go at address 300 to find the address of an operand. The address of an operand in this example is 500. The operand found at location 500. Indirect Addressing need two memory reference, one for to find address of an operand & another one for operand itself.

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