A LPC/ISA bridge and its bridging method are disclosed for bridging an LPC interface to an ISA interface. The LPC/ISA bridge is activated in response to a duty cycle indicative signal (LFRAME#), and serially transforms related command, address and data information from command/address/data lines (LAD[3:0]) of the LPC interface into address, data and control signals of the ISA interface. Therefore, the problem as to the interface incompatibility is solved.
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