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4 to 2 Priority Encoder This is also referred to as 4- bit priority, which consists of 4 inputs and 2 output lines. Since an encoder contains 2^n input lines and n output lines.
Priority Encoder. A 4 to 2 priority encoder has 4 inputs: Y3, Y2, Y1 & Y0, and 2 outputs: A1 & A0. Here, the input, Y3 has the highest priority, whereas the input, Y0 has the lowest priority.
The truth table for a 8-to-3 bit priority encoder is given as: Where X equals “dont care”, that is it can be at a logic “0” level or at a logic “1” level. From this truth table, the Boolean expression for the encoder above with data inputs D0 to D7 and outputs Q0, Q1, Q2 is given as: Output Q0. Output Q1. Output Q2.
4 to 2 Priority Encoder. In 4 to 2 types, the total inputs are four namely D0, D1, D2 & D3, and outputs are two like X & Y. Here ‘Do’ has fewer priority inputs whereas ‘D2’ has high priority inputs. Once the above one input is ‘1’ simultaneously, the output will be the binary code that is equivalent to the high priority input. The ...
A truth table of a single bit 4-to-2 priority encoder is shown, where the inputs are shown in decreasing order of priority left-to-right, and "x" indicates a don't care term - i.e. any input value there yields the same output since it is superseded by a higher-priority input.
A 4:2 priority encoder has four inputs and two outputs like a normal binary encoder. The difference lies in the truth table. For a priority encoder, the output is dependant on the highest priority bit.
With this truth table, we can design our priority Encoder using Verilog. Let’s see how: Behavioral Modeling of 4:2 Priority Encoder. As usual, starting with the module and the port declaration. module priority_encoderbehave(A, Y); input [3:0]Y; output reg [1:0]A;
A 4-to-2 priority encoder has 4 inputs named I 3, I 2, I 1, and I 0, along with 2 outputs labeled Z 1 and Z 0. Within this setup, I 3 is assigned the highest priority, while I 0 is assigned the lowest.
The truth table for a four-input (4:2) priority encoder is given in Table where X represents the don’t care state. For an input word, the active bit with the highest weight has priority and the output will be as per the highest priority input.
4 to 2 priority encoder. A 4-to-2 priority encoder takes 4 input bits and produces 2 output bits. In this truth table, for all the non-explicitly defined input combinations (i.e. inputs containing 2, 3, or 4 high bits) the lower priority bits are shown as don't cares (X).