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Circuit Description

An 8-bit priority encoder. This circuit basically converts a one-hot encoding into a binary representation. If input n is active, all lower inputs (n-1 .. 0) are ignored. Please read the description of the 4:2 encoder for an explanation.

x7 x6 x5 x4 x3 x2 x1 x0   y2 y1 y0
----------------------------------
 1  X  X  X  X  X  X  X    1  1  1
 0  1  X  X  X  X  X  X    1  1  0
 0  0  1  X  X  X  X  X    1  0  1
 0  0  0  1  X  X  X  X    1  0  0
 0  0  0  0  1  X  X  X    0  1  1
 0  0  0  0  0  1  X  X    0  1  0
 0  0  0  0  0  0  1  X    0  0  1
 0  0  0  0  0  0  0  X    0  0  0