Communications controller
US4484263A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 25, 1981 |
| Grant date | Nov 20, 1984 |
| Priority date | — |
| Expiry date | Sep 25, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F13/385
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
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 e…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.