Video-processing chip, audio-video system and related method capable of saving power

1. A video-processing chip capable of saving power comprising:

a microprocessor for executing program codes;

a scalar for adjusting a size of a received image;

a first memory coupled to the microprocessor and the scalar for providing memory space for the scalar for image processing; and

a second memory coupled to the microprocessor storing the program codes of the microprocessor for controlling a power switch to turn off power to a microprocessor external to the video-processing chip.

2. The video-processing chip of claim 1 wherein a size of the first memory is greater than a size of the second memory.

3. The video-processing chip of claim 1 further comprising a timing controller coupled to the scalar.

4. The video-processing chip of claim 3 further comprising an output device coupled to the timing controller for outputting signals that are processed by the scalar and the timing controller.

5. The video-processing chip of claim 1 further comprising an input device coupled to an input end of the scalar for receiving an image signal.

6. The video-processing chip of claim 1 wherein the microprocessor is an 8051 single-chip.

7. The video-processing chip of claim 1 wherein the microprocessor includes a plurality of input ports and output ports.

8. The video-processing chip of claim 1 wherein the first memory is a static random access memory (SRAM).

9. The video-processing chip of claim 1 wherein the second memory is a static random access memory.

10. The video-processing chip of claim 1 wherein the second memory is a read only memory (ROM).

11. An audio-video system capable of saving power comprising:

an audio-video controlling device comprising a first microprocessor;

a flash memory coupled to the audio-video controlling device; and

a video-processing chip coupled to receive output of the audio-video controlling device comprising:

a second microprocessor for executing program codes;

a scalar for adjusting a size of a received image;

a first memory coupled to the second microprocessor and the scalar for providing memory space for the scalar for image processing; and

a second memory coupled to the second microprocessor for receiving program codes of the second microprocessor from the flash memory for controlling a power switch to turn off power to the first microprocessor.

12. The audio-video system of claim 11 wherein a size of the first memory is greater than a size of the second memory.

13. The audio-video system of claim 11 further comprising a serial bus interface coupled between the first microprocessor and the second microprocessor for transmitting instructions.

14. The audio-video system of claim 11 further comprising a timing controller coupled to the scalar.

15. The audio-video system of claim 14 further comprising an output device coupled to the timing controller for outputting signals that are processed by the scalar and the timing controller.

16. The audio-video system of claim 11 further comprising an input device coupled to an input end of the scalar for receiving an image signal.

17. The audio-video system of claim 11 wherein the second microprocessor is an 8051 single-chip.

18. The audio-video system of claim 11 wherein the second microprocessor includes a plurality of input ports and output ports.

19. The audio-video system of claim 11 wherein the first memory is a static random access memory.

20. The audio-video system of claim 11 wherein the second memory is a static random access memory.

21. The audio-video system of claim 11 wherein the second memory is a read only memory.

22. The audio-video system of claim 11 wherein the audio-video controlling device is a digital versatile disc player (DVD player).

23. The audio-video system of claim 11 wherein the audio-video controlling device is a digital versatile disc recorder (DVD recorder).

24. The audio-video system of claim 11 wherein the audio-video controlling device is a television.

25. A method capable of saving power in an audio-video system, the audio-video system comprising an audio-video controlling device having a first microprocessor and a flash memory storing codes for controlling the audio-video system and a video processing chip having an on-chip second microprocessor and first memory, the method comprising:

the first microprocessor transmitting program codes for controlling a power switch from the flash memory to the first memory; and

the second microprocessor executing the codes stored in the first memory to turn off power to the first microprocessor when getting into a stand-by mode.

26. The method of claim 25 further comprising:

the flash memory of the audio-video controlling device transmitting program codes of the second microprocessor of the video-processing chip for executing instructions to a second memory when getting into an active mode.

27. The method of claim 26 further comprising:

the flash memory of the audio-video controlling device transmitting program codes of the second microprocessor of the video-processing chip for controlling the power switch to the second memory when getting into the stand-by mode.

28. The method of claim 27 further comprising:

the second microprocessor of the video-processing chip executing the program codes stored in the second memory.

29. The method of claim 25 further comprising:

the second microprocessor of the video-processing chip executing the program codes stored in the first memory for receiving a remote signal, time power on, or receiving a control signal from users through audio-video interfaces.

30. The method of claim 25 further comprising:

a first microprocessor of the audio-video controlling device used for controlling operations of the audio-video system when getting into the active mode.

31. The method of claim 25 further comprising:

the second microprocessor of the video-processing chip used for controlling operations of the audio-video system when getting into the stand-by mode.