VERILOG 6: DECODER DESIGN EXAMPLES
Decoder Design Using Predecoding •Example: 256-output (8 input bits) with predecode –Ex: take groups of 2 input bits •Four possibilities; activate one of four wires (use 2 INVs, 4 ANDs) –Wires along array: 22 * (8/2) = 4 groups of 4 = 16 (same as non-predecoded) –Each output uses a 4-input AND gate (much faster)
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