ADDRESS COMPARING CIRCUIT, AND CIRCUIT DEVICE USING THE ADDRESS COMPARING CIRCUIT

摘要

PURPOSE: To provide an address comparing circuit in which switching of an output of a comparing signal in a write-cycle is suppressed and a needless charging/discharging current of comparing signal line can be reduced. CONSTITUTION: A master latch circuit 12 and a slave latch circuit 21 are register for write-only and the master latch circuit 12 and slave latch circuits 21, 22 are controlled by WCLK generated in a write-cycle. The slave latch circuit 22 is controlled by RCLK generated in a read-cycle. A slave latch circuit 23 is a latch circuit provided for comparing addresses. A master latch circuit 11 and the slave latch circuit 23 are controlled by CLK generated in both cycles of a write-cycle and a read-cycle. An address comparing circuit 1 is connected to a contact point W1 of a write-register and a contact point N1 of the slave latch circuit 23 provided for comparing addresses as comparing points, and a read-out control signal RE is inputted.