Binary Encoder vs Priority Encoder: What's the Difference? Quiz and Flashcards

Study Notes

Binary encoder is a combinational circuit that converts N inputs to 2 to the power of N or fewer outputs.
Operation of a binary encoder is reverse of a decoder, with inputs and outputs reversed.
In the encoder, only one input is assumed to be high at a given time.
The encoder's output depends on the input that is high.
A 4-line to 2-line binary encoder has 4 inputs and 2 outputs.
The encoder's logic circuit uses OR gates to implement logical expressions for each output based on which inputs are high.
An 8-line to 3-line binary encoder has 8 inputs and 3 outputs, encoding specific 3-bit codes based on which input is high.
Encoders are useful when connecting multiple input devices to a processor or controller with limited I/O pins.
Encoders can also be used for octal to binary conversion and decimal to BCD conversion.
A limitation of a normal encoder is that it does not function properly when all inputs are 0, resulting in the same output.
Another limitation is that when more than one input is high, the encoder's output will be invalid, requiring priority to be set to inputs.- Priority encoder sets the priority of inputs with higher subscripts, making them more important.
When multiple high priority inputs occur simultaneously, the one with the higher subscript takes precedence.
Output of priority encoder reflects the highest priority input, while an additional output indicates if any input is high.
Priority encoder eliminates limitations of normal encoder by allowing multiple high inputs and indicating priority.
In next video, detailed explanation, logic circuit, and design of large priority encoder from small one will be covered.
Video also covers normal binary encoder before priority encoder introduction.
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Description

Learn about the operation and logic circuit of binary encoders, their limitations, and how priority encoders solve these issues. Understand the importance of priority setting in input encoding and its application in processor connectivity.