| 摘要 |
PROBLEM TO BE SOLVED: To provide a circuit which decides whether a present value transmitted through a bus is equal to one of several desired values or not. SOLUTION: This circuit can include a monitor random access memory(RAM) (120) and a monitor circuit (130). Bits of desired values in the position of a second set are stored in places (220-1 to 220-X in the monitor RAM) having the addresses formed by bits of desired values in the position of a first set. When a value ('the present value') is transmitted through the bus, bits of the present value in the position of the first set are given as an address to the monitor RAM (120) to generate bits stored in the addressed place as the output. A monitor circuit (130) compares the output of the monitor RAM (120) with bits of the present value in the position of the second set (230, 240, 250, and 260) to generate a result. This result indicates whether a desired value is generated on the bus or not.
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