A method for setting a signal line connection mode between a utopia slave mode adapter and a master block and a utopia slave mode adapter will be described. The utopia slave mode adapter includes an FIFO for storing RX ATM data, an RX-side utopia connection controller, comprising: an asynchronous transmission mode signal processing apparatus including first and second blocks operating as a master block and complying with the UTOPIA connection standard; And a D-type flip-flop for generating a valid signal connected to the TX-side utopia access controller, a FIFO for storing TX ATM data, and an output terminal of the FIFO for storing TX ATM data.
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