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Pull-up termination resistor detection circuit for high-speed interface

A terminal resistor and high-speed interface technology, applied in the direction of logic circuit connection/interface layout, etc., can solve problems affecting the working speed of high-speed interfaces, and achieve the effect of ensuring normal working speed

Active Publication Date: 2016-06-22
ALLWINNER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Based on this, it is necessary to provide a high-speed interface pull-up terminal resistance detection circuit for the problem that the pull-up terminal resistance detection circuit affects the working speed of the high-speed interface

Method used

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  • Pull-up termination resistor detection circuit for high-speed interface
  • Pull-up termination resistor detection circuit for high-speed interface

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Embodiment Construction

[0027] In order to make the technical solution of the present invention more clear, the pull-up termination resistance detection circuit of the high-speed interface of the present invention will be further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0028] like figure 2 As shown, an embodiment of a pull-up terminal resistance detection circuit of a high-speed interface is used for detection of a pull-up terminal resistance of a high-speed interface;

[0029] The pull-up terminal resistance detection circuit includes a detection signal generation module and an input module, the detection signal generation module is electrically connected to the pull-up terminal resistance and the input module respectively, the detection signal generation module is controlled by an enable signal, and the detection...

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Abstract

The invention discloses a pull-up terminal resistance detection circuit of a high-speed interface, which is used for detecting the pull-up terminal resistance of a high-speed interface. The pull-up terminal resistance detection circuit includes a detection signal generation module and an input module, and the detection signal generation module is connected with the The pull-up terminal resistor is electrically connected to the input module, the detection signal generation module is controlled by the enable signal, and the detection signal output by the detection signal generation module is input to the input module; when the pull-up terminal resistance is in the working state, the output signal of the input module is logic 1; When the pull-up terminal resistor is idle, the output signal of the input module is logic 0. The pull-up terminal resistance detection circuit of the high-speed interface of the present invention effectively solves the problem of the back-feeding of the local power supply by the high-speed interface when the local power supply is invalid, so that the transistor is not damaged; the load capacitance introduced in the high-speed interface is the smallest, ensuring The normal operating speed of the high-speed interface.

Description

technical field [0001] The invention relates to the technical field of detection circuits, in particular to a pull-up terminal resistance detection circuit of a high-speed interface. Background technique [0002] At present, there are endless interconnection interface protocols between devices. Some protocols require the source device to be able to detect in real time whether the pull-up terminal resistor of the other device on the high-speed interface exists. Generally, the following methods are used: figure 1 The detection circuit diagram shown is used to detect whether there is a pull-up termination resistor on the other side of the high-speed interface. The circuit includes a P-channel field effect transistor, an N-channel field effect transistor and a Schmitt trigger. The source of the P-channel field effect transistor is connected to the interface, the gate is connected to the enabling signal, and the drain is connected to the drain of the N-channel field effect transi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K19/0175
Inventor 倪陈志王洪魁丁然
Owner ALLWINNER TECH CO LTD
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