Video timing signal generation circuit
First Claim
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1. A video timing signal generation circuit comprising:
- a plurality of control registers; and
a programmable CPU running at a particular frequency and generating timings by loading the control registers on the fly, wherein the plurality of control registers includes a down counter register, a pixel counter backing register, an output signal register and an output signal backing register.
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Abstract
A programmable CPU running at a video display rate, or a sub-multiple thereof, is used to generate the timings by loading control registers on the fly. In a preferred embodiment, a very reduced instruction set is used to generate VSYNC, HSYNC, and CSYNC signals. The CPU executes instructions out of an Instruction SRAM. The CPU'"'"'s main goal is to load a pair of backing registers before a down counter reaches the value of zero.
27 Citations
7 Claims
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1. A video timing signal generation circuit comprising:
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a plurality of control registers; and a programmable CPU running at a particular frequency and generating timings by loading the control registers on the fly, wherein the plurality of control registers includes a down counter register, a pixel counter backing register, an output signal register and an output signal backing register. - View Dependent Claims (2, 3, 4, 5)
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6. A video timing signal generation circuit, comprising:
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a plurality of control registers; and a programmable CPU, said programmable CPU being programmed to generate timing signals in response to a very reduced set of instructions, and to load the control registers with said timing signals, wherein said very reduced set of instructions consists of four instructions. - View Dependent Claims (7)
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Specification