Data communication control device

Multiplex communications – Wide area network – Packet switching

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Details

370463, G06F 1516, G06F 1342, H04L 1260

Patent

active

057457042

ABSTRACT:
A data communication device adapted to notify abnormal transmission timing at the start of transmission. A receiving register, synchronized with synchronous signal, receives input data via an upper transmission path from a facing instrument. The receiving register performs a serial-parallel conversion on the input data. A receiving control unit detects the completion of the serial-parallel conversion and restores transmitted data, delivered on the upper transmission path from the facing equipment, by sequentially combining the serial-parallel converted input data. A transmitting register receives transmission data of predetermined word length and parallel-serial converts the transmission data in synchronization with the synchronous signal. The transmitting register delivers the parallel-serial converted output data to a lower transmission path. A transmission control unit generates plural data formed by dividing, at intervals based on the predetermined word length, the transmission data. The transmission control unit sequentially provides the plural data to the transmission register when the completion of the parallel-serial conversion is detected. A transmission state monitoring unit which determines whether delivery of the transmission data has been completed when a predetermined time difference has elapsed from when the serial-parallel conversion is completed, and outputs this result as transmission state data.

REFERENCES:
patent: 4710871 (1987-12-01), Belknap et al.
patent: 4744079 (1988-05-01), Csapo et al.
patent: 4815099 (1989-03-01), Shimatani et al.
patent: 4891783 (1990-01-01), Aritaka et al.
patent: 5506965 (1996-04-01), Naoe
Texas Instruments Data Sheet; TL16C450; Data Transmission Circuits Data Book; pp. 3-3 to 3-25, 1993.

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