METHOD AND SYSTEM FOR COMMUNICATION WITH SD MEMORY AND SDIO DEVICES

• US 20090177816A1
• Filed: 01/04/2008
• Published: 07/09/2009
• Est. Priority Date: 01/04/2008
• Status: Abandoned Application

• Current Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Original Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Inventors: Guo, Jun, Marx, Gerald
• Application Number:
  US11/969,367
• Publication Number:
  US 20090177816A1
• Time in Patent Office: Days
• US Class Current: 710/72
• CPC Class Codes: G06F 13/1668 Details of memory controller

Abstract

The disclosed systems and methods relate to a reduction of system complexity by incorporating a clock cut-off signal in an SDIO device in order to support a multi-drop architecture. Aspects of the present invention enable a multi-drop architecture with an SDIO device and multiple SD memory devices sharing the same SD bus. Aspects of the present invention may also reduce host complexity by enabling a single host to control an SD device and multiple SD memory cards.

Claims

1. A system for communicating with a Secure Data Input/Output (SDIO) device and a Secure Data (SD) memory, wherein the system comprises:

an SD bus;

an SDIO host controller for communicating data, via the SD bus, with at least one of the SDIO device and the SD memory; and

a processor for enabling and disabling a clock signal to the SDIO device.

2. The system of claim 1, wherein the SD bus comprises a command line, a clock line, and four data lines.

3. The system of claim 2, wherein a signal on the command line indicates one of the SDIO device and the SD memory.

4. The system of claim 1, wherein the processor is connected to a General Purpose Input/Output (GPIO) for enabling and disabling the clock signal to the SDIO device.

5. The system of claim 1, wherein the SDIO device is a wireless device.

6. The system of claim 5, wherein the SDIO host controller receives an interrupt from the wireless device when data is available.

7. The system of claim 5, wherein the wireless device is a Bluetooth device.

8. The system of claim 5, wherein the wireless device is a wireless local area network device.

9. A method for communicating with a Secure Data Input/Output (SDIO) device and a Secure Data (SD) memory, wherein the method comprises:

deselecting the SDIO device;

disabling a clock to the SDIO device;

selecting the SD memory;

reading data from the selected SD memory into a host buffer;

deselecting the SD memory card;

enabling the clock to the SDIO device; and

selecting the SDIO device.

10. The method of claim 9, wherein a 1-bit mode is enabled prior to deselecting the SDIO device.

11. The method of claim 9, wherein a 4-bit mode is enabled after to selecting the SDIO device.

12. The method of claim 9, wherein the clock to the SDIO device is enabled and disabled via a GPIO input to the SDIO device.

13. The method of claim 9, wherein the SDIO device is a wireless device.

14. The method of claim 13, wherein the wireless device is a Bluetooth device.

15. The method of claim 13, wherein the wireless device is a wireless local area network device.

16. The method of claim 9, wherein the SD memory is selected via a signal on the command line.

17. The method of claim 9, wherein the data from the SD memory is read from the host buffer into an SDIO device buffer.

18. A method for communicating with a Secure Data Input/Output (SDIO) device and a Secure Data (SD) memory, wherein the method comprises:

reading data from the SDIO device into a host buffer;

deselecting the SDIO device;

disabling a clock to the SDIO device;

selecting the SD memory;

reading data from the host buffer into the selected SD memory;

deselecting the SD memory card; and

enabling the clock to the SDIO device.

19. The method of claim 18, wherein the clock to the SDIO device is enabled and disabled via a GPIO input.

20. The method of claim 18, wherein a host receives an interrupt from the SDIO device when data is available.

21. The method of claim 18, wherein the SDIO device is a wireless device.

22. The method of claim 21, wherein the wireless device is a Bluetooth device.

23. The method of claim 21, wherein the wireless device is a wireless local area network device.

24. The method of claim 18, wherein the SD memory is selected via a signal issued by a host.

25. The method of claim 18, wherein a 1-bit mode is enabled while the SDIO device is deselected.