| 摘要 |
PROBLEM TO BE SOLVED: To provide a priority encoder that is miniaturized by decreasing its number of components and attains high-speed encoding. SOLUTION: The priority encoder 10 consists of means 12a, 12b, 12c, 12d detecting it that a true value input is given to at least one of input lines includes in each high-order bit dependent group with respect to the high-order bit dependent groups where high-order bits of output codes ('A3 A2 A1 A0') belong to the same input line, a means 20 that outputs a code ('A3 A2') of the high- order bits corresponding to the highest ranking high-order bit dependent group whose ranking is highest among the high-order bit dependent groups whose true value input is detected, means 22, 24, 26 that inactive the input given to the input line included in the high-order bit dependent group whose ranking is lower than the highest high-order bit dependent group, means 18a, 18b, 18c, 18d that detect the true value input to each low-order bit dependent group configured with the same input line for the low-order bits of the output code, and a means 40 that outputs a code ('A1 A0') of the low-order bit corresponding to the group whose ranking is highest among the low-order bit dependent groups whose true value input is detected.
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