Apparatus for controlling an I/O port by queuing requests and in

Details Apparatus for controlling an I/O port by queuing requests and in Apparatus for controlling an I/O port by queuing requests and in

1995-09-08

1998-10-06

Lee, Thomas O.

395287, 395828, 395849, 395736, G06F 1300

Patent

active

058191127

ABSTRACT:
An improved operating system for a personal computer including a method for controlling a parallel I/O port for peer-to-peer communication is disclosed. The improved operating system includes a port driver which supports communication with multiple peripheral devices through a single parallel port. The peripheral devices are connect to the parallel port via a multiplexer and may include non-interrupt devices, master/slave devices, and peer-to-peer devices. The parallel port driver includes a port arbitrator and a plurality of class device drivers to control access to the parallel port. Each class device driver communicates with a particular class of devices connected to the port. The port arbitrator controls access to port by the various class device drivers. The parallel port includes configurable control registers that include interrupt control bits for enabling and disabling interrupts communicated by peripheral devices. A device driver may set the interrupt control bits so as to disable the port for receiving certain interrupt requests from peer-to-peer devices. The port arbitrator monitors the status of the port and enables the port to receive interrupt requests from peer-to-peer devices when a predefined condition is detected.

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