| 摘要 |
PROBLEM TO BE SOLVED: To provide a signal multiplexer/demultiplexer capable of minimizing signal discard without the need for increasing the circuit scale. SOLUTION: PMAs 11, 15 carry out recovery of a clock from a GbE [Gigabit Ethernet (R)] signal received from ports 1, 2, serial/parallel conversion of the signal, and detection of input interruption. 8B/10B synchronization sections 12, 16 synchronize 8B/10B codes on the basis of signals in 10 bits subjected to parallel processing by the PMAs 11, 15, respectively. Pointer insert sections 13, 17 insert a pointer indicating a port number into idle codes of the 8B/10B codes. Fixed pattern generating sections 19, 20 generate dummy signals inserted at signal interruption. Selection sections 14, 18 select either of real signals and the dummy signals. A multiplexer section 21 applies bit multiplex to the signals of the port 1 and the signals of the port 2. COPYRIGHT: (C)2007,JPO&INPIT
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