Multi-port type universal asynchronous receiver/ transmitter system using time division system

摘要

A multi-port universal asynchronous receiver/transmitter (UART) system is disclosed having time division multiplexing and demultiplexing. The system has plural UART's and includes a time slot generating unit for generating time slot signals corresponding to defined time slots which correspond in number to the plurality of UART's. A receiving data separating unit separates a single stream of received data into a plurality of receiving data streams to correspond with the time slots. Plural receiving data control units time expand respective ones of the separated receiving data streams. The UART's each receive a respective one of the time expanded receiving data streams and output them to an appliance, such as a computer. The UART's also receive data, from the appliance, for transmission. Plural transmitting data control units each receive a stream of transmitting data from a respective one of the plurality of UART's. The transmitting data control units each time compress their respective data streams and align the compressed data bits with a corresponding time slot. A transmitting data coupling unit receives the compressed data bits from the transmitting data control units and couples them into a single data line. The disclosed multi-port UART system is capable of using a single transmitting line and a single receiving line, thereby reducing the cost of the appliance due to simplification of circuitry and reducing cost of system installation due to a reduction in the number of transmitting and receiving lines.