Apparatus and method for setting adequate drive strength...

Details Apparatus and method for setting adequate drive strength... Apparatus and method for setting adequate drive strength...

2005-05-12

2009-06-16

Norris, Jeremy C (Department: 2841)

Electricity: electrical systems and devices

Housing or mounting assemblies with diverse electrical...

For electronic systems and devices

C361S748000, C361S760000, C029S592100, C029S593000

Reexamination Certificate

active

07548433

ABSTRACT:
An information handing system having apparatus for setting adequate drive strength based upon direct current (DC) trace resistance uses a resistance detection traces for each signal layer of a printed circuit board. These resistance detection traces are coupled to pull-up resistors and routed with a length and cross-sectional geometry that is substantially equal to the worst case routing of a net on a bus that is to be free of receiver mask violations (inadequate received signal strengths). Reference voltage levels may be determined for each bus so as to be representative of the minimum voltage acceptable to guarantee that the worst-case DC trace resistance will not cause the bus waveforms to fail signal integrity. A voltage comparator circuit may be used to compare the determined reference voltage levels with the voltage levels of the resistance detection traces of each of the printed circuit board layers. When the voltage comparator determines that a resistance detection trace voltage is too low, an output from the voltage comparator may be used to generate an error message to a general purpose input-output (GPIO) that may initiate programming (e.g., change the flash memory) of a bus controller so as to use the next higher drive strength setting.

REFERENCES:
patent: 6430606 (2002-08-01), Haq
patent: 6496037 (2002-12-01), Bertin et al.
patent: 7177610 (2007-02-01), Scott et al.
patent: 7205787 (2007-04-01), Massoumi et al.
patent: 7336212 (2008-02-01), Fung et al.
patent: 2002/0050844 (2002-05-01), Lau et al.

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