ACtE04 · Chapter 4Computer Organization & Embedded Systems🏛️ Past Licensure QuestionID: 0f7dca33
A CPU control unit whose binary control words (micro-instructions) are stored in a dedicated control memory is known as a:
A CPU control unit whose binary control words (micro-instructions) are stored in a dedicated control memory is known as a:
Multiple Choice Options
- A
Hardwired control unit
- B
Software control unit
- C✓ Correct Option
Micro-programmed control unit
- D
Hardware sequencer unit
Detailed Technical Solution & Explanation
A Micro-programmed Control Unit stores control signal patterns as binary micro-instructions in a special internal memory called the Control Store. Each machine instruction initiates a sequence of micro-instructions that generate the necessary gating and control pulses. This contrasts with a Hardwired Control Unit, which uses fixed combinational logic gates and sequential flip-flop counters to generate control signals directly.
Option Analysis:
•
Option A (Hardwired control unit): Uses fixed combinational gates and state machines, without control memory.
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Option B (Software control unit): Misnomer; CPU control units are physical hardware entities.
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Option C (Micro-programmed control unit): Correct; control variables are stored in control memory.
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Option D (Hardware sequencer unit): Component within a control unit, not the complete classification.
Reference: Mock Test 03NEC Licensure Syllabus