Data processing system having a trace mechanism and method there

Details Data processing system having a trace mechanism and method there Data processing system having a trace mechanism and method there

1997-09-11

1999-10-19

Hafiz, Tariq R.

Electrical computers and digital processing systems: memory

Storage accessing and control

Hierarchical memories

39518308, 39518303, 39518314, 39518401, 395186, 395500, 711152, 711154, 711163, 711 1, G06F 944

Patent

active

059702460

ABSTRACT:
A data processing system (10) having an access protect unit (20) for tracing memory accesses. A trace bit (50) is associated with each page of memory and when set generates an interrupt signal on a first valid access to the page. The access protect unit (20) supports trace in both supervisor and user mode without the need for an emulation system or an on-chip emulator. Tracing is done without providing "backdoor" access to the central processing unit (CPU). The access protect unit (20) allows programmable memory segment tracing. Signature monitoring of memory accesses is accomplished by storing sequential memory segments in a plurality of registers.

REFERENCES:
patent: 5513337 (1996-04-01), Gillespie et al.
patent: 5701486 (1997-12-01), Gilbertsen et al.
patent: 5850562 (1998-12-01), Crump et al.
patent: 5870606 (1999-02-01), Lindsey
patent: 5870607 (1999-02-01), Netzer

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