System management mode and in-circuit emulation memory mapping a

Details System management mode and in-circuit emulation memory mapping a System management mode and in-circuit emulation memory mapping a

Filed on

1994-07-25

Date issued

1997-04-22

Examiner

Harvey, Jack B.

Other Related Categories

395726, 395739, 395740, 395742, G06F 1300

Type

Patent

Status

active

Patent number

056236735

Description

ABSTRACT:
A computer system is provided that includes an interrupt driven system management mode during which system management code is accessed. In one embodiment, a lock-out register is provided to prevent accesses to the system management code while the computer system is operating in its normal mode. In one embodiment, an interrupt control unit is coupled to the ICE interrupt line of the microprocessor core, and controls a memory control unit in accordance with assertions of an external "debug" interrupt signal and an external SMM (system management mode) interrupt signal. If the debug interrupt signal is asserted while the microprocessor core is operating in its normal mode, the interrupt control unit responsively asserts the ICE interrupt signal to the microprocessor core, thereby, causing the microprocessor core to execute ICE code. If, however, the SMM interrupt signal is asserted while the microprocessor core is operating in its normal mode, the interrupt control unit responsively asserts an ICE interrupt signal which causes the microprocessor core to commence executing the SMM code. Both the SMM code and ICE code may be mapped within a region of system memory which is common to the mapping of a video controller.

REFERENCES:
patent: 5175853 (1992-12-01), Kardach et al.
patent: 5339437 (1994-08-01), Yuen
patent: 5363500 (1994-11-01), Takeda
patent: 5392420 (1995-02-01), Balmer et al.
patent: 5437039 (1995-07-01), Yuen

Affiliated with

Also associated with

Rating

System management mode and in-circuit emulation memory mapping a does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with System management mode and in-circuit emulation memory mapping a, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System management mode and in-circuit emulation memory mapping a will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-349981