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Official PYQ · 2018

GATE EC 2018 Set 1 Q32 — Diode Circuits

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A 2×22\times 2 ROM array is built with the help of diodes as shown in the circuit below. Here W0W0 and W1W1 are signals that select the word lines and B0B0 and B1B1 are signals that are output of the sense amps based on the stored data corresponding to the bit lines during the read operation.

    B0        B1W0W1[D00D01D10D11]\:\:\:\:B_{0}\:\:\:\:\:\:\:\:B_{1}\\ \begin{matrix} W_{0}\\ W_{1} \end{matrix} \begin{bmatrix} D_{00} &D_{01} \\ D_{10}& D_{11} \end{bmatrix}

Bits stored in ROM Array\text{Bits stored in ROM Array}

During the read operation, the selected word line goes high and the other word line is in a  high impedance state. As per the implementation shown in the circuit diagram above, what are the bits corresponding toDij(where i=0 or 1 and j=0 or 1)D_{ij} (\text{where}\: i=0\: \text{or}\: 1\: \text{and}\: j=0\: \text{or}\: 1) stored in the ROM?

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Answer: A

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