"Modular SRAM-Based Binary Content-Addressable Memories". Architecture of block-RAM-based massively parallel memory structures : multi-ported memories and content-addressable memories (Thesis). Recursive construction of priority encoders Ī priority-encoder, also called leading zero detector (LZD) or leading zero counter (LZC), receives an n is recommended to achieve higher performance and area compression, since the mux can be implemented using 6-LUT, hence an entire ALM.Īn open-source Verilog generator for the recursive priority-encoder is available online. The priority encoder is an improvement on a simple encoder circuit, in terms of handling all possible input configurations.
Priority encoders can be easily connected in arrays to make larger encoders, such as one 16-to-4 encoder made from six 4-to-2 priority encoders - four 4-to-2 encoders having the signal source connected to their inputs, and the two remaining encoders take the output of the first four as input.
The output V indicates if the input is valid. any input value there yields the same output since it is superseded by higher-priority input. An example of a single bit 4 to 2 encoder is shown, where highest-priority inputs are to the left and "x" indicates an irrelevant value - i.e.
If two or more inputs are given at the same time, the input having the highest priority will take precedence.
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