| 摘要 |
PROBLEM TO BE SOLVED: To enable high-speed operation by providing an exclusive OR circuit, calculating and inputting the wired-OR logic of its output to a decision circuit and outputting a signal indicating a match or mismatch, and suppressing the potential of a wired-OR node by using a potential suppressing circuit. SOLUTION: When one of 1-bit comparing circuits SG1 to SGn finds that input data Din matches comparison data Dcp, a current flows to a transistors Q1 or Q3 connected to a node Na in each of other 1-bit comparing circuits having found mismatches and a current (i) is drawn from the node Na. When a mismatch is one bit, a current flowing to the base-side diode D1 of a transistor Q11 in a decision device 10 becomes i+ia=ti/4 obtained by adding a current ia(=i/4) flowing to a transistor Q13 to the drawn current (i). The potential at the node Na becomes lower than that at a node Nb by a forward potential difference based upon the difference in current density between the two diodes D1 and D2. |
