Question
Download Solution PDFWhat is a four-line to two-line priority encoder with active HIGH inputs and outputs, with priority assigned to the higher-order data input line?
This question was previously asked in
UPSC ESE (Prelims) Electronics and Telecommunication Engineering 19 Feb 2023 Official Paper
Answer (Detailed Solution Below)
Option 1 : X = D2 + D3 and Y = D1D̅2 + D3
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Detailed Solution
Download Solution PDFHere, X represents the priority encoder output.
Y represents the valid output corresponding to the highest order active input.
- In a four-line to two-line priority encoder, the goal is to encode the highest order active input among four lines into a two-bit output.
- X = D2+D3
- This equation means that the output X is active (HIGH) when either D2 or D3 is active.
- It indicates the encoding of the higher-priority input.
- Y = D1\(\overline D_2\)+D3
- Y is the two-bit output. It is formed by combining D1D2 if both D1 and D2 are active, or by using D3 if D3 is active alone. This represents the highest-order active input.
- X = D2+D3
- Y = D1\(\overline D_2\)+D3
Here, option 1 is correct.
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