Memory card detection circuit and method

A technology for detecting circuits and memory cards, applied in the field of memory cards, can solve problems such as low efficiency and troublesome processes, save system resources, and solve the effect of existing and memory card power failure

Active Publication Date: 2014-08-06
XIAMEN YAXON NETWORKS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Not efficient, and the

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  • Memory card detection circuit and method

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Embodiment Construction

[0022] The present invention will be further described below through specific embodiments.

[0023] The power input terminal VCC of the memory card can be turned on and off under the control of the processor. Generally, the power level of the memory card is high, and the power level of the memory card is low.

[0024] The memory card detection pin T1 is the detection pin of the memory card socket, generally the memory card exists as a low level, and the memory card does not exist as a high level.

[0025] The output detection pin T2 is connected to the processor detection pin of the system. The main processor judges whether there is a signal in the memory card through this pin, and then the system performs business processing such as memory card mounting.

[0026] refer to figure 1 , a memory card detection circuit, connected between the memory card power input terminal VCC and the memory card detection pin T1, including

[0027] A first switch circuit, the input terminal of...

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Abstract

A memory card detection circuit is connected between the input end of a memory card power supply and a memory card detection pin, and comprises a first switch circuit, a second switch circuit and an output detection pin; the input end of the first switch circuit is connected with the input end of the memory card power supply, and the first switch circuit is used for detecting whether the memory card power supply supplies power; the input end of the second switch circuit is connected with the output end of the memory card detection pin, and the second switch circuit is used for detecting whether the memory card exists; the output detection pin is connected with the output end of the first switch circuit and the output end of the second switch circuit, and is used as the output detection pin for detecting whether a memory card has a signal. The memory card detection circuit and method can detect a memory card inexistence state whether the memory card is really pulled out or the memory card power supply is disconnected, and realize the memory card detection and power failure detection, so as to solve the problems of memory card existence and memory card power failure; and a basis is provided for a next operation of the system by adopting the same detection pin, software is not required to participate in judgment, and system resources are saved.

Description

technical field [0001] The invention relates to the field of memory cards, in particular to a memory card detection circuit and method. Background technique [0002] Memory cards, such as SD cards and TF cards, have card presence detection pins in their card holders. After the memory card is artificially pulled out, it can generate a card non-existence signal and be detected by the processor. However, if the card is always in the card slot , the processor will detect that the card has been signaled. Because many application methods rely on the main processor to judge whether the memory card exists through this pin, and then the system performs business processing such as memory card mounting, reading and writing. When the memory card fails unexpectedly during use, the system needs to be triggered to reinitialize the memory card. In addition to powering off the memory card, the system also needs to notify other software modules through software to initialize the memory card...

Claims

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Application Information

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IPC IPC(8): G11C29/00
Inventor 陈茹涛韦昌荣许宁刘燚华杨峰
Owner XIAMEN YAXON NETWORKS CO LTD
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