Data processor with concurrent static and dynamic masking of ope

Details Data processor with concurrent static and dynamic masking of ope Data processor with concurrent static and dynamic masking of ope

1991-04-02

1994-06-07

Bowler, Alyssa H.

Boots, shoes, and leggings

3642641, 3642597, 3642595, 3642596, 3642591, 3642581, 3642599, 3642615, 364267, 36426791, G06F 922, G06F 926, G06F 1118, G06F 1330

Patent

active

053197631

ABSTRACT:
A data processing system (10) implements a static and a dynamic masking operation of operand information concurrently. 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 concurrently implemented using a specialized bit cell (60) contained in both the breakpoint register (24) and the CAM array (26). The specialized bit cell (60) is comprised of two transistors (62 and 64) to concurrently mask a respective bit of operand information during a comparison operation.

REFERENCES:
patent: 4450365 (1984-05-01), Hoff, Jr. et al.
patent: 4453229 (1984-06-01), Schaire
patent: 4546428 (1985-10-01), Morton
patent: 4734909 (1988-03-01), Bennett et al.
patent: 5239642 (1993-08-01), Gutierrez et al.

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