| 摘要 |
PURPOSE: A duplication apparatus of a switching center is provided to make the same data stored in the memories of active and standby circuit boards as dual circuit boards, and thereby allows the dual circuit boards to be operated active and standby modes. CONSTITUTION: The first circuit board(100) includes a CPU(2), an address buffer(4), a memory(6), lathes(8,12), a data buffer(10), and a duplication controller(14), a duplication search part(16) and an interrupt controller(18). The second circuit board(200) includes a CPU(22), an address buffer(24), a memory(26), lathes(28,32), a data buffer(30), and a duplication controller(34), a store controlling part(36), a duplication search part(38) and an interrupt controller(40). The CPU(2) generates an address and data, and provides them to the address buffer(4) and the data buffer(10), respectively. The latch(8) keeps the address applied from the address buffer(4) for a certain time, and then supplies it the latch(38). The controller(14) checks the cycle from the CUP(2) at the active mode, and thereby controls the lathes(8,12). The part(16) compares the address and data from the CPU(2) with those from the lathes(8,12) to generate an interrupt signal.
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