| 摘要 |
PURPOSE:To obtain result of CRC operation independently to each of two consecutive data blocks by transmitting a synchronous character to a CRC operation circuit for a prescribed period when a specific character detection circuit detects a specific character, a transmitting an output of a first-in/first-out memory to the CRC operating circuit in other case so as to check the reception data. CONSTITUTION:When a text interruption code ITB is detected by a specific character detecting circuit 2, it is informed to a processor 7. The processor 7 reads the result of CRC operation, activates a CRC operation reset line 73, resets the CRC operating circuit 6 to activate a synchronous character generating circuit activating signal line 70, receives a synchronous character SYN and inputs the synchronous character to the CRC operating circuit 6 for a prescribed time. After a prescribed time is elapsed, the processor 7 operates a selector input terminal selection command line 71 so that a signal on an output signal line 40 of the first-in/first-out memory 4 appears on an output signal line 50 of a selector again and the result is inputted to the CRC operating circuit 6. |
