Data processor with shared control and drive circuitry for both

Details Data processor with shared control and drive circuitry for both Data processor with shared control and drive circuitry for both

1991-04-02

1993-08-24

Bowler, Alyssa H.

Excavating

371 19, 365 49, 364DIG1, G06F 1100, G06F 1202, G11C 800

Patent

active

052396428

ABSTRACT:
A data processing system (10) implements a combined static and a dynamic masking operation of a breakpoint address. A static mask implements a conditional mask of a predetermined number of bits specified by the user and is determined prior to a comparison operation between the breakpoint address stored in a breakpoint register (24) and a logical address transferred via a logical address bus (11). A dynamic mask value implements a variable mask which allows the data processing system to mask the breakpoint address according to the size of a breakpoint address access. The static mask value and the dynamic mask value are combined using the same circuitry to form a combined mask value (19). Breakpoint function and address translation are implemented in the system (10) by using the same drive and control circuitry (20,44,48) to accomplish both functions. The breakpoint register (24) is implemented as an entry in a CAM array (26).

REFERENCES:
patent: 3937938 (1976-02-01), Matthews
patent: 4635193 (1987-01-01), Moyer et al.
patent: 4675646 (1987-06-01), Lauer
patent: 4740895 (1988-04-01), Sargent et al.
patent: 4866665 (1989-09-01), Haswell-Smith
patent: 5057837 (1991-10-01), Colwell et al.
patent: 5134701 (1992-07-01), Mueller et al.
patent: 5165027 (1992-11-01), Krauskopf et al.
IEEE Software, vol. v5 No. 5 "Strong Debugger has Few Flaws" by Kapoor, B. Sep. 1988 p. 105.

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