Connected module type distinguishing apparatus and method

Details Connected module type distinguishing apparatus and method Connected module type distinguishing apparatus and method

1997-09-19

2000-02-15

Cabeca, John W.

Electrical computers and digital processing systems: memory

Storage accessing and control

Hierarchical memories

711119, 711 5, 710 63, G06F 1200

Patent

active

060264691

ABSTRACT:
A module type distinguishing apparatus and method for differentiating between modules based upon the presence or absence of a pulling resistor at a specified pin connection of the modules. A high impedance pulling resistance is connected to the line and is subject to sensing while a tri-state mode of operation is initiated in the module. The presence or absence of the pulling resistor in the module is detected and recorded in a register. Differentiation between module types is accomplished based upon the binary state of the data in the register. In a particularized implementation, industry standard L2 cache modules are distinguished as to tag bit size depending on the presence or absence of a pulling resistor as detected during tri-state operation of a tag output pin.

REFERENCES:
patent: 5586270 (1996-12-01), Rotier et al.
patent: 5594873 (1997-01-01), Garrett
patent: 5898856 (1999-04-01), Dodd et al.

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