Virtual I/O
US5047922A · kind A · utility
31Cited by
8References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 27, 1990 |
| Grant date | Sep 10, 1991 |
| Priority date | — |
| Expiry date | Jul 27, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F13/10
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus are disclosed for coupling external, bidirectional ports to an onboard port of a single chip microprocessor such that the external ports can be addressed in the same manner as onboard ports. Using the disclosed method and apparatus, external ports, which are referred to herein as virtual ports, a single onboard port may be configured that it can be used to address up to twelve virtual ports. The port is used as a multiplexed bus to communicate with the virtual ports. Read (RD) and write (WR) signals are used to perform read and write operations on the virtual ports.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.