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Correct description of "En" output for Priority Encoder #378

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Correct description of "En" output for Priority Encoder #378

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30 changes: 29 additions & 1 deletion docs/chapter4/5muxandplex.md
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Expand Up @@ -278,7 +278,9 @@ You can verify the behavior of the **Least Significant Bit (LSB)** detector circ

## Priority Encoder

The **Priority Encoder** circuit element works similarly to the **MSB and LSB **detector. There is a specific output based on the bit position of the MSB, irrespective of the lesser significant bits. An enable input is also provided to activate/deactivate the priority encoder. If there are N outputs, there will be 2^N inputs.
The **Priority Encoder** circuit element works similarly to the **MSB and LSB **detector. There is a specific output based on the bit position of the MSB, irrespective of the lesser significant bits. If there are N outputs, there will be 2^N inputs.

There is also an output labeled "EN", which is 1 when the input is valid (e.g., not all zero).

In the live circuit embedded below, a **Priority Encoder** with four single-bit inputs (T3, T2, T1 and T0 from most to least-significant bit) and two single-bit outputs (O2 and O1 from most to least-significant bit). Table 4.6 displays the truth table of the four-input priority encoder.

Expand All @@ -299,6 +301,24 @@ Table 4.6 : Truth table of a four-input priority encoder
</td>
<td><strong>O1</strong>
</td>
<td><strong>EN</strong>
</td>
</tr>
<tr>
<td>0
</td>
<td>0
</td>
<td>0
</td>
<td>0
</td>
<td>0
</td>
<td>0
</td>
<td>0
</td>
</tr>
<tr>
<td>0
Expand All @@ -313,6 +333,8 @@ Table 4.6 : Truth table of a four-input priority encoder
</td>
<td>0
</td>
<td>1
</td>
</tr>
<tr>
<td>0
Expand All @@ -327,6 +349,8 @@ Table 4.6 : Truth table of a four-input priority encoder
</td>
<td>1
</td>
<td>1
</td>
</tr>
<tr>
<td>0
Expand All @@ -341,6 +365,8 @@ Table 4.6 : Truth table of a four-input priority encoder
</td>
<td>0
</td>
<td>1
</td>
</tr>
<tr>
<td>1
Expand All @@ -355,6 +381,8 @@ Table 4.6 : Truth table of a four-input priority encoder
</td>
<td>1
</td>
<td>1
</td>
</tr>
</table>

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