ECE 2110: Introduction to Digital Systems Chapter 6 Combinational Logic Design Practices Encoders.

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ECE 2110: Introduction to Digital Systems Chapter 6 Combinational Logic Design Practices Encoders.

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ECE 2110: Introduction to Digital Systems Chapter 6 Combinational Logic Design Practices Encoders

Previous: 74x139 & 74x138 decoders

Encoders Multiple-input/multiple-output device. Performs the inverse function of a Decoder. Outputs ( m ) are less than inputs ( n ). Converts input code words into output code words. input code output code ENCODER

Encoders vs. Decoders Binary decoders/encoders Decoder Encoder n-to-2^n Input code : Binary Code Output code :1-out-of-2^n. 2^n-to-n encoder Input code : 1-out-of-2^n. Output code : Binary Code

Binary Encoder 2^n-to-n encoder : 2^n inputs and n outputs. Input code : 1-out-of-2^n. Output code : Binary Code Example : n=3, 8-to-3 encoder Inputs Outputs I0 I1 I2 I3 I4 I5 I6 I7 Y2 Y1 Y0 1 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 1 0 0 1 0 0 0 0 0 0 1 0 0 0 0 1 0 0 0 0 0 1 1 0 0 0 0 1 0 0 0 1 0 0 0 0 0 0 0 1 0 0 1 0 1 0 0 0 0 0 0 1 0 1 1 0 0 0 0 0 0 0 0 1 1 1 1 I4 Y2 I5 I6 I7

8-to-3 encoder Implementation Simplified implementation: - From the truth table Y0 = I1 + I3 + I5 + I7 Y1 = I2 + I3 + I6 + I7 Y2 = I4 + I5 + I6 + I7 Limitations : - I0 has no effect on the output - Only one input can be activated Application: Handling multiple devices requests But, no simultaneous requests Establishing priorities solve the problem of multiple requests Y2 I1 I2 Y1 I3 I4 I5 Y0 I6 I7

Need priority in most applications

74x148 8-input priority encoder Active-low I/O Enable Input “Got Something": Group Select Enable Output

74x148 Truth Table

74x148 circuit

Next… Multiplexers Reading Wakerly CH-6.6-6.7