USB/PS2 interface automatic identification device and method

An automatic identification and interface technology, applied in the detection of faulty computer hardware, etc., can solve problems such as misjudgment of interface type, uncertain level status, etc.

Inactive Publication Date: 2003-11-26
ELAN MICROELECTRONICS CORPORATION
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  • Abstract
  • Description
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Problems solved by technology

The disadvantage of this method is that the PS2 interface on the host terminal 10 may be floating or high-impedance, which will cause the D+ and D- level states to be uncertain when the peripheral device 12 is plugged in, and cause the peripheral device 12 to misjudge the plugged-in interface type. state

Method used

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  • USB/PS2 interface automatic identification device and method
  • USB/PS2 interface automatic identification device and method
  • USB/PS2 interface automatic identification device and method

Examples

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Embodiment Construction

[0017] The system block diagram of the present invention is still shown in FIG. 1 , and when the present invention is applied to a USB low-speed device, it also complies with the specification shown in FIG. 2 . However, in one embodiment, the USB transceiver of the present invention is shown in FIG. 3, which includes a mode operation device 50, which receives two control signals MUSB and MPS2, and output terminals 52 and 54 are respectively connected to the D+ / PS2Clk port 18 and D- / PS2Data port 20, same as the prior art, this transceiver also includes a differential receiver 56, single-ended receivers 58 and 60, USB output buffers 62 and 64 to receive and transmit USB signals. The mode operation device 50 includes a detection mechanism, which detects the logic states on the ports 18 and 20, and then determines whether to use the USB or PS2 interface.

[0018] Fig. 4 is an embodiment of mode operation device 50, and it comprises mode selection device 68, detection mode device 7...

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Abstract

The present invention relates to automatic interface identifying technology for device supporting USB interface and PS2 interface simultaneously. One detecting mechanism is connected between the first and the second ports, which are provided for equipment to be connected via USB interface or PS2 interface to the system unit. The detecting mechanism includes two functions of mode selection and interface detection, the interface detection function includes logic confirm device and interface distinguishing algorithm, and the mode selection function accepts the first and the second controls for the interface detection function to connect the logic confirm device to the first and the second ports so as to detect the logic state of the first and the second ports, to distinguish whether USB interface or PS2 interface is connected via cooperating with the algorithm and further to complete corresponding signal transmission with the proper mechanism.

Description

technical field [0001] The invention relates to a communication interface device, more particularly, to a USB / PS2 interface automatic identification device and method. Background technique [0002] USB is a standard interface for connecting or communicating with a computer system and its peripheral devices. Although there are more and more peripheral devices supporting the USB interface, for some peripheral devices with low transmission rate, such as keyboards and mice, if they can support the traditional PS2 interface at the same time, it is still a relatively acceptable choice in the market. [0003] 1 is a system block diagram showing a host 10 connected to a peripheral device 12 that can support USB and PS2 transmission functions. The peripheral device 12 includes a mechanism 14 that can handle USB transmission specifications and a mechanism 16 that can handle PS2 transmission specifications. Both are connected to the host computer 10 through the...

Claims

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Application Information

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IPC IPC(8): G06F11/22
Inventor 邱延诚吴高彬叶丁豪罗铭铨
Owner ELAN MICROELECTRONICS CORPORATION
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