The pin that clears the command, request and temporary registers and internal first/last flipflop when it is set is
Answer & step-by-step solution
The RESET input initializes the DMA controller by clearing command, request and temporary registers and resetting internal sequencing such as the first/last flip-flop. Therefore RESET is the required pin.
Concept & Reasoning
DMA controllers contain internal state that must return to a known condition at system initialization. RESET disables/clears operational state so channels and mode registers can be reprogrammed safely. HOLD/HLDA are bus arbitration signals and do not perform this internal register clearing.
How to Solve It in the Exam
Clear internal controller state → RESET.
Important Exam Point
Differentiate reset/init signals from bus request/acknowledge signals.
Quick Trick
Clear internal controller state → RESET.
Common Mistake
Choosing HLDA, which only acknowledges a bus hold request.
वह पिन जो सेट होने पर कमांड, रिक्वेस्ट और टेम्पररी रजिस्टर तथा आंतरिक फर्स्ट/लास्ट फ्लिप-फ्लॉप को क्लियर करती है
उत्तर और चरणबद्ध हल
D — RESET। RESET इनपुट DMA कंट्रोलर को इनिशियलाइज़ करता है — कमांड, रिक्वेस्ट और टेम्पररी रजिस्टर क्लियर करता है और फर्स्ट/लास्ट फ्लिप-फ्लॉप रीसेट करता है।
विस्तृत हल (मूल भाषा में)
Concept & Reasoning
DMA controllers contain internal state that must return to a known condition at system initialization. RESET disables/clears operational state so channels and mode registers can be reprogrammed safely. HOLD/HLDA are bus arbitration signals and do not perform this internal register clearing.
How to Solve It in the Exam
Clear internal controller state → RESET.
Important Exam Point
Differentiate reset/init signals from bus request/acknowledge signals.
Quick Trick
Clear internal controller state → RESET.
Common Mistake
Choosing HLDA, which only acknowledges a bus hold request.
તે પિન જે સેટ થાય ત્યારે કમાન્ડ, રિક્વેસ્ટ અને ટેમ્પરરી રજિસ્ટર તથા આંતરિક ફર્સ્ટ/લાસ્ટ ફ્લિપ-ફ્લોપને ક્લિયર કરે છે
જવાબ અને પગલાવાર ઉકેલ
D — RESET. RESET ઇનપુટ DMA કંટ્રોલરને ઇનિશિયલાઇઝ કરે છે — કમાન્ડ, રિક્વેસ્ટ અને ટેમ્પરરી રજિસ્ટર ક્લિયર કરે છે અને ફર્સ્ટ/લાસ્ટ ફ્લિપ-ફ્લોપ રીસેટ કરે છે.
વિગતવાર ઉકેલ (મૂળ ભાષામાં)
Concept & Reasoning
DMA controllers contain internal state that must return to a known condition at system initialization. RESET disables/clears operational state so channels and mode registers can be reprogrammed safely. HOLD/HLDA are bus arbitration signals and do not perform this internal register clearing.
How to Solve It in the Exam
Clear internal controller state → RESET.
Important Exam Point
Differentiate reset/init signals from bus request/acknowledge signals.
Quick Trick
Clear internal controller state → RESET.
Common Mistake
Choosing HLDA, which only acknowledges a bus hold request.
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