System and method for fast data transfer to display driver

• US 20030093591A1
• Filed: 11/09/2001
• Published: 05/15/2003
• Est. Priority Date: 11/09/2001
• Status: Abandoned Application

• Current Assignee: Lifescan Incorporated (Duv Holding Corporation)
• Original Assignee: Lifescan Incorporated (Duv Holding Corporation)
• Inventors: Hohl, David
• Application Number:
  US10/008,522
• Publication Number:
  US 20030093591A1
• Time in Patent Office: Days
• US Class Current: 710/22
• CPC Class Codes: G06F 13/28 using burst mode transfer, e.g. direct memory access DMA, cycle steal G06F13/32 takes precedence
• CPC Class Codes: G06F 3/14 Digital output to display device ; Cooperation and interconnection of the display device with other functional units

Abstract

Apparatus and methods for fast data transfer from a memory or storage device to a display controller. The apparatus comprise a memory, a direct memory access controller operatively coupled to the memory, and a display controller operatively coupled to the direct memory access controller and configured to transfer a data stream from the memory to the display controller. The apparatus may also comprise stored programming configured to set up the display controller with a display address for the data stream, set up the direct memory access controller with a source address for the data stream, a destination address for the data stream, and a size for the data stream, and initiate transfer of the data stream by the direct memory access controller to the display controller. The methods comprise transferring a data stream from a memory to a display controller using a direct memory access controller. The transferring may comprise setting up the display controller with a display address for the data stream, setting up the direct memory access controller with a source address for the data stream, a destination address for the data stream, and a size for the data stream, and initiating transfer of the data stream by the direct memory access controller to the display controller.

Claims

1. A data processing apparatus, comprising:

(a) a memory;

(b) a direct memory access controller operatively coupled to said memory; and

(c) a display controller operatively coupled to said direct memory access controller;

(d) said direct memory access controller configured to transfer a data stream from said memory to said display controller.

2. The apparatus of claim 1, further comprising stored programming configured to set up said display controller with a display address for said data stream.

3. The apparatus of claim 2, further comprising stored programming configured to set up said direct memory access controller with a source address for said data stream, a destination address for said data stream, and a size for said data stream.

4. The apparatus of claim 3, further comprising stored programming configured to initiate transfer of said data stream by said direct memory access controller to said display controller.

5. The apparatus of claim 1, further comprising:

(a) a cyclic redundancy check circuit operatively coupled to said direct memory access controller;

(b) said direct memory access controller configured to transfer a check data stream from said memory to said cyclic redundancy check circuit; and

(e) said cyclic redundancy check circuit configured to calculate a check value for said check data stream.

6. The apparatus of claim 5, further comprising stored programming configured to seed said cyclic redundancy check circuit with a selected initial value.

7. The apparatus of claim 6, further comprising stored programming configured to set up said direct memory access controller with a source address for said check data stream, a destination address for said check data stream, and a size for said check data stream.

8. The apparatus of claim 7, further comprising stored programming configured to initiate transfer of said check data stream by said direct memory access controller from said memory to said cyclic redundancy check circuit.

9. The apparatus of claim 7, further comprising stored programming configured to read said calculated cyclic redundancy check value from said cyclic redundancy check circuit and store said calculated cyclic redundancy check value in said memory.

10. The apparatus of claim 1, wherein said display controller is a liquid crystal display controller.

11. A method for processing data, comprising transferring a data stream from a memory to a display controller using a direct memory access controller.

12. The method of claim 11, wherein said transferring comprises setting up said display controller with a display address for said data stream.

13. The method of claim 12, wherein said transferring further comprises setting up said direct memory access controller with a source address for said data stream, a destination address for said data stream, and a size for said data stream.

14. The method of claim 13, wherein said transferring further comprises initiating transfer of said data stream by said direct memory access controller to said display controller.

15. The method of claim 11, further comprising:

(a) transferring a check data stream from said memory to a cyclic redundancy check circuit using said direct memory access controller; and

(b) calculating a cyclic redundancy check value for said check data stream by said cyclic redundancy check circuit.

16. The method of claim 15, wherein said transferring said check data stream to said cyclic redundancy check circuit comprises seeding said cyclic redundancy check circuit with a selected initial value.

17. The method of claim 16, wherein said transferring said check data stream to said cyclic redundancy check circuit further comprises setting up said direct memory access controller with a source address for said check data stream, a destination address for said check data stream, and a size for said check data stream.

18. The method of claim 17, wherein said transferring said data stream to said cyclic redundancy check circuit further comprises initiating transfer of said check data stream by said direct memory access controller to said cyclic redundancy check circuit.

19. The method of claim 18, wherein said transferring said check data stream to said cyclic redundancy check circuit further comprises transferring each byte in said check data stream to said cyclic redundancy check circuit by said direct memory access controller.

20. The method of claim 15, further comprising reading said calculated cyclic redundancy check value from said cyclic redundancy check circuit and storing said calculated cyclic redundancy check value in said memory.

21. A data processing apparatus, comprising

(a) means for storing data;

(b) display controller means for transferring data to a display; and

(c) direct memory access controller means for transferring a data stream from said data storing means to said display controller means.

22. The apparatus of claim 21, further comprising program means for setting up said display controller means with a display address for said data stream.

23. The apparatus of claim 22, further comprising further comprising program means for setting up said direct memory access controller means with a source address for said data stream, a destination address for said data stream, and a size for said data stream.

24. The apparatus of claim 23, further comprising further comprising program means for initiating transfer of said data stream by said direct memory access controller means to said display controller means.