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Universal serial bus device

A universal serial bus, bus signal technology, applied in the direction of instruments, electrical digital data processing, sustainable buildings, etc., can solve the problems of high power consumption, not notifying the USB device 104, etc., to achieve the effect of avoiding power consumption

Active Publication Date: 2009-10-21
VIA LABS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the conventional technology, the host 102 does not notify the USB device 104 when the USB transmission is disabled, causing the USB device 104 to remain in the normal operating state U0 and consume a large amount of power.

Method used

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Embodiment Construction

[0016] In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments are listed below and described in detail in conjunction with the accompanying drawings.

[0017] figure 2 It is an embodiment of the universal serial bus (universal serial bus, USB) system of the present invention, and the transmission technology adopted is USB 3.0. The USB system includes a host 202 , a USB device 204 and a USB cable connecting the host 202 and the USB device 204 . A USB cable is composed of multiple transmission lines. For the convenience of explanation, figure 2 Only the TX+ transmission line and TX- transmission line in this USB cable are marked in .

[0018] The USB device 204 includes: an electrical physical layer (electrical physical layer, EPHY) module 206, a logical physical layer (logical physical layer, LPHY) module 208, a link layer (link layer) module 210 and a protocol layer (protocollayer) module ...

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Abstract

The invention discloses a universal serial bus device which comprises an electronic physical layer module, a logical physical layer module and a connecting layer module. The electronic physical layer module is responsible for deciphering the voltages of a first transmission line and a second transmission line in a universal serial bus so as to generate recovery time pulse and data. The logical physical layer module detects the recovery time pulse and the data so as to generate an indication signal and sets the indication signal as a specific value when no recovery time pulse is detected. The connecting layer module judges whether the indication signal is the specific value and counts the time length for maintaining the specific value of the indication signal. If the indication signal maintains the specific value for certain time length, the connecting layer module leads a state machine to get out of normal operation state. The universal serial bus device can fast enter de-energizing connecting state after the transmission of the universal serial bus of a host machine is de-energized, thereby avoiding meaningless power consumption.

Description

technical field [0001] The present invention relates to a universal serial bus (universal serial bus, USB) technology, in particular to the USB 3.0 technology. Background technique [0002] figure 1 It is a universal serial bus (USB) system, including a host 102, a USB device 104, and a USB cable 106 connecting the two. This manual especially takes USB 3.0 technology as an example. [0003] Under normal operation, both the host 102 and the USB device 104 are in a normal operation state U0 to send and receive data packets normally. The user can freely disable the USB transmission of the host 102 . For example, the USB transmission of the host 102 can be disabled by using an operation “safely remove USB device” provided by the operating system of the host 102 . [0004] However, in the conventional technology, the host 102 does not notify the USB device 104 when the USB transmission is disabled, causing the USB device 104 to remain in the normal operating state U0 and cons...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F13/42
CPCY02B60/1228Y02B60/1235Y02D10/00
Inventor 刘孟帆林佑隆
Owner VIA LABS INC
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