Apparatus and method for automatic measurement of ring oscillato

Details Apparatus and method for automatic measurement of ring oscillato Apparatus and method for automatic measurement of ring oscillato

1997-01-15

1998-04-28

Hjerpe, Richard

Computer graphics processing and selective visual display system

Display driving control circuitry

Display power source

345211, 331 57, G09G 500

Patent

active

057451060

ABSTRACT:
A ring oscillator is embedded into the same silicon wafer as the functional circuits. The output of the ring oscillator and a display clock signal are both directed into seperate inputs of a multiplexer which is controlled by the computer BIOS. When the BIOS desires to read the ring oscillator frequency, the multiplexer is switched, thus providing the output of the ring oscillator to the display status register. The resulting frequency may be used to optimize clock speeds.

REFERENCES:
patent: 4227185 (1980-10-01), Kronlage
patent: 4788540 (1988-11-01), Tokumitsu et al.
patent: 4961071 (1990-10-01), Krooss
patent: 5047967 (1991-09-01), Sander et al.
patent: 5555032 (1996-09-01), Kung
patent: 5638028 (1997-06-01), Voth

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