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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
First Claim
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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.

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