Communications controller

Details Communications controller Communications controller

1981-09-25

1984-11-20

Smith, Jerry

Boots, shoes, and leggings

G06F 300, G06F 1300

Patent

active

044842635

ABSTRACT:
An intelligent asynchronous controller (IAC) for use in operably coupling a plurality of asynchronous input/output (I/O) devices to a host central processing unit (CPU) is disclosed. The IAC is designed and programmed to control the transfer of data between the plurality of I/O devices and the CPU, to perform character processing on the data received from the I/O devices before transmission to the host CPU and to perform other types of data processing. The IAC is organized around a central processor bus and includes a host interface section which serves as a communication link between the host CPU and the central processor bus, a processor unit which controls the overall operations of the IAC and which contains a date manipulation section and a control processor section, a memory section for providing local read/write storage for the processor along with read only storage for use on power up and certain other instances, a communications interface section for interfacing the IAC with the plurality of I/O devices, a status section for providing certain status indications for the IAC and a power supply section. The host interface section features an internal mapping unit (IMU) which expands the fifteen bit address provided by the processor section to the nineteen bit address of the CPU bus. The processor section features a processor which is capable of processing upwards of 5000 characters a second. The memory section features a read/write memory unit which is used to store the program and data and a "power up" ROM which enables the IAC to run internal diagnostic tests. The communications interface section features a split BAUD clock selection unit which enables split BAUD rate transmissions when the IAC is connected to modems rather than directly to I/O devices.

REFERENCES:
patent: 4075691 (1978-02-01), Davis et al.
patent: 4079452 (1978-03-01), Larson et al.
patent: 4110830 (1978-08-01), Krygowski
patent: 4124891 (1978-11-01), Weller et al.
patent: 4177515 (1979-12-01), Jenkins et al.
patent: 4328543 (1982-05-01), Brickman et al.
patent: 4410961 (1983-10-01), Dlugos et al.

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