| 摘要 |
PURPOSE: To insert a test signal without increasing the interface between packages and increasing power consumption. CONSTITUTION: Signals of preset m-lines among n×m lines of signals obtained resulting from n×m parallel expansion of PN 15-stage to PN 23-stage signals are allocated to be outputted from test signal generating sections 12-1 to 12-n of signal processing circuits 1-1 to 1-n. Changeover sections 13-1 to 13-n pass a transmission signal received by the signal processing circuits 1-1 to 1-n in the normal operation, and switch each output test signal from the test signal generating sections 12-1 to 12-n in the case of testing the transmission line, and a test signal is sent to signal processing sections 14-1 to 14-n. When a synchronization pulse generating section 16 detects it that the output signal of the test signal generating section 12-1 reaches a prescribed pattern, the generating section 16 generates a synchronization pulse to synchronize the operation timings of each of the test signal generating sections 12-1 to 12-n. |
