Method for detecting data transmission rate of USB controller by using USB device

• US 20030223486A1
• Filed: 10/04/2002
• Published: 12/04/2003
• Est. Priority Date: 05/29/2002
• Status: Active Grant

• Current Assignee: VIA Technologies Incorporated (VIA Technologies)
• Original Assignee: VIA Technologies Incorporated (VIA Technologies)
• Inventors: Hsu, Hung-Chou
• Granted Patent: US 7,173,964 B2
• Time in Patent Office: Days
• US Class Current: 375/224
• CPC Class Codes: G06F 13/385 for adaptation of a particular data processing system to different peripheral devices

Abstract

The present invention discloses a method for detecting data transmission rate of a USB controller by using a USB device having at least one program storage device, said method comprising steps of: activating an IRQ signal of a timer by using a program; detecting whether said USB controller transmits a signal corresponding to a high-speed USB controller within a pre-determined period of time; if not, setting data transmission in a full-speed mode; if yes, setting data transmission in a high-speed mode.

Claims

1. A method for detecting data transmission rate of a USB controller by using a USB device having at least one program storage device, said method comprising steps of:

a. activating an IRQ signal of a timer by using a program;

b. detecting whether said USB controller transmits a K signal within a pre-determined period of time;

if not, setting data transmission in a full-speed mode;

if yes, proceeding with step c;

c. detecting whether said USB controller transmits a J signal within said pre-determined period of time;

if not, setting data transmission in said full-speed mode;

if yes, proceeding with step d;

d. repeating step b and step c twice, and proceeding with step e only if data transmission is not set in said full-speed mode; and

e. setting data transmission in a high-speed mode.

2. The method as claimed in claim 1, wherein said program storage device comprises a transmission rate identifying flag.

3. The method as claimed in claim 2, further comprising a step a0 before said step a:

setting said transmission rate identifying flag to be zero.

4. The method as claimed in claim 3, wherein said step b and said step c are replaced respectively by steps of:

bb. detecting whether said USB controller transmits a K signal within said pre-determined period of time;

if not, setting said transmission rate identifying flag and data transmission in said full-speed mode;

if yes, proceeding with step cc; and

cc. detecting whether said USB controller transmits a J signal within said pre-determined period of time;

if not, setting said transmission rate identifying flag and data transmission in said full-speed mode;

if yes, proceeding with said step d.

5. The method as claimed in claim 4, further comprising a step d1 after said step d:

examining whether said transmission rate identifying flag is in said full-speed mode;

if yes, setting data transmission in said full-speed mode;

if not, proceeding with said step e.

6. The method as claimed in claim 1, wherein said program storage device is a memory.

7. The method as claimed in claim 1, wherein said pre-determined period of time is 3.0 ms.

8. The method as claimed in claim 2, wherein said transmission rate identifying flag is a column in a register.

9. The method as claimed in claim 2, wherein the value “

1”

of said transmission rate identifying flag represents said full-speed mode.

10. The method as claimed in claim 1, wherein said USB controller is installed in a host selected from one of a computer and a hub.

11. A method for detecting data transmission rate of a USB controller by using a USB device having at least one program storage device, said method comprising steps of:

activating an IRQ signal of a timer;

detecting whether said USB controller transmits a signal corresponding to a high-speed USB controller within a pre-determined period of time, and

if yes, setting data transmission in a high-speed mode;

if not, setting data transmission in a full-speed mode.

12. The method as claimed in claim 11, wherein said pre-determined period of time is 3.0 ms.

13. The method as claimed in claim 11, wherein said signal corresponding to said high-speed USB controller is a signal representing KJKJKJ.

14. The method as claimed in claim 13, wherein said period of time between said K and said J signal is less than 3.0 ms.

15. The method as claimed in claim 11, wherein said USB controller is installed in a host selected from one of a computer and a hub.

16. The method as claimed in claim 11, wherein said program storage device is a memory.

17. The method as claimed in claim 11, wherein said program storage device comprises a transmission rate identifying flag.

18. A method for detecting data transmission rate of a USB controller by using a USB device having at least one program storage device, wherein said program storage device comprises a transmission rate identifying flag, said method comprising steps of:

setting said transmission rate identifying flag to be zero before transmitting said IRQ signal;

detecting whether said USB controller transmits said signal corresponding to said high-speed USB controller within said pre-determined period of time;

if yes, setting said transmission rate identifying flag in said high-speed mode;

if not, setting said transmission rate identifying flag in said full-speed mode; and

setting data transmission rate according to said transmission rate identifying flag.

19. The method as claimed in claim 18, further comprising a step before setting said data transmission rate:

confirming that the detecting result is consistent with said transmission rate identifying flag.

20. The method as claimed in claim 18, wherein the value “

1”

of said transmission rate identifying flag represents said full-speed mode.