The group of bits 10110111 is serially shifted (rightmost bit first) into an 8-bit parallel output shift register with an initial state 11110000. After two clock pulses, the register contains ____________
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A serial-in/parallel-out register accepts one incoming bit per clock. With the rightmost bit transmitted first, perform two serial shifts from the stated initial register contents; the answer follows from those two state transitions.
Formula / Key Relation
At clock k:
new register = shifted(old register) + next serial bit
Detailed Explanation
Concept & ReasoningThe phrase 'rightmost bit first' fixes the transmission order. Each clock causes the existing register contents to move one position while one new serial bit enters. Only two of the eight incoming bits have entered after two pulses, so most of the initial state is still present. This is why stepwise register tracing is essential.How to Solve It in the ExamWrite the first two transmitted bits explicitly before shifting.Important Exam PointCheck whether the serial stream is LSB-first or MSB-first before the first clock.Related Revision PathThis question sits in the revision path Digital Electronics → Sequential Logic → Shift…
Concept & Reasoning
The phrase 'rightmost bit first' fixes the transmission order. Each clock causes the existing register contents to move one position while one new serial bit enters. Only two of the eight incoming bits have entered after two pulses, so most of the initial state is still present. This is why stepwise register tracing is essential.
How to Solve It in the Exam
Write the first two transmitted bits explicitly before shifting.
Important Exam Point
Check whether the serial stream is LSB-first or MSB-first before the first clock.
Related Revision Path
This question sits in the revision path Digital Electronics → Sequential Logic → Shift Registers .
Quick Trick
Write the first two transmitted bits explicitly before shifting.
Common Mistake
Reading 10110111 left-to-right despite the instruction 'rightmost bit first'.
Exam Tip
Check whether the serial stream is LSB-first or MSB-first before the first clock.
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