Graphics controller utilizing a variable frequency clock
First Claim
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1. A memory clock system for a graphics controller having functional units which includes:
- a plurality of clock pulse generators, a clock controller including,input lines having a state, said state being determined by the activity of said functional units,clock control logic circuitry responsive to the state of said input lines,an output signal line, said output signal line connected to each of said plurality of clock pulse generators wherein the clock control logic circuitry sends a signal on the output signal line, the signal indicating which of the clock pulse generators is to be active, whereby said clock controller causes said plurality of clock pulse generators to generate clock pulses at a predetermined frequency for use by the graphics controller based on the state of said functional units.
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Abstract
The present invention includes a memory clock system for a graphics controller including a plurality of clock pulse generators, and a clock controller which selects the clock frequency based on the state of the graphics controller functional units.
81 Citations
5 Claims
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1. A memory clock system for a graphics controller having functional units which includes:
- a plurality of clock pulse generators, a clock controller including,
input lines having a state, said state being determined by the activity of said functional units, clock control logic circuitry responsive to the state of said input lines, an output signal line, said output signal line connected to each of said plurality of clock pulse generators wherein the clock control logic circuitry sends a signal on the output signal line, the signal indicating which of the clock pulse generators is to be active, whereby said clock controller causes said plurality of clock pulse generators to generate clock pulses at a predetermined frequency for use by the graphics controller based on the state of said functional units. - View Dependent Claims (2, 3, 4)
- a plurality of clock pulse generators, a clock controller including,
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5. A memory clock system for a graphics controller having functional units which includes:
- a variable clock pulse generator, a clock controller including,
input lines having a state, said state being determined by the activity of said functional units, clock control logic circuitry responsive to the state of said input lines, an output signal line, said output signal line connected to the variable clock pulse generator, wherein the clock control logic circuitry sends a signal on the output signal line the signal indicating a clock frequency to be generated by the variable clock pulse generator, whereby said clock controller causes said variable clock pulse generator to generate variable rate clock pulses for use by the graphics controller based on the state of said functional units.
- a variable clock pulse generator, a clock controller including,
Specification