Processor configurable for both virtual mode and protected mode

Details Processor configurable for both virtual mode and protected mode Processor configurable for both virtual mode and protected mode

1994-06-08

1996-07-30

Voeltz, Emanuel T.

Boots, shoes, and leggings

395700, G06F 15163

Patent

active

055418538

ABSTRACT:
A processor system for connection to a communications network comprises a processor and a memory configurable for operation with the processor in at least two modes, a virtual mode and a protected mode in which operation of the processor and memory is dedicated to data transfer between the processor system and a communications network. A switching device is provided for switching between the virtual and protected modes, which is operable under user program control, in response to a data transfer request generated when data is to be transferred between the memory and the communications network. The switching device then switches to the protected mode, such that there is direct data transfer between the memory and the communications network. A method of controlling transfer of data between a communications network and the processor system, comprises configuring a memory in the processor system for operation with a processor in at least a virtual and a protected mode in which operation of the processor and memory is dedicated to data transfer between the processor system and a communications network. Switching between virtual and protected modes occurs under user program control, in response to a data transfer request, when data is to be transferred between the memory and the communications network.

REFERENCES:
patent: 5086402 (1992-02-01), Sterling, II
patent: 5095445 (1992-03-01), Sekiguchi
patent: 5303378 (1994-04-01), Cohen
IBM Corp., "OS/2 Version 2.0 vol. 2: DOS and Windows Environment," Apr. 1992, Chapter 3, pp. 29-35.

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