Process for initializing memory card

A memory card and initialization technology, applied in the field of memory cards, can solve problems such as inability to determine, the card cannot be determined, and the memory card cannot directly transmit data, etc., and achieve the effect of ensuring accuracy and improving initialization processing.

Inactive Publication Date: 2006-05-03
VIMICRO CORP
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above-mentioned existing initialization schemes are not comprehensive enough. Although it can be determined that the memory card is an SD card or an MMC card, it cannot be determined which type of card the card is. For example, although it can be determined as an SD card, it cannot be determined that it is a standard card. SD card, or SDIO card or other types of SD card
[0007] In addition, the above initialization scheme only puts the memory card in the stand by state by obtaining the RCA of the memory card, but does not put the memory card in a further state, such as entering the ready state or data transmission state, so the memory card after the above initialization process may not be able to directly data transfer

Method used

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  • Process for initializing memory card
  • Process for initializing memory card
  • Process for initializing memory card

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Embodiment Construction

[0030] The scheme of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0031] The realization process of the scheme of the present invention is as figure 1 As shown, corresponding to the following steps:

[0032] Step 101, set the clock frequency according to the memory card, and set the delay period.

[0033] To be compatible with different types of memory cards, it is necessary to set the clock frequency according to those memory cards. For example, to be compatible with SD Card and MMC card, the clock frequency can be set to 400kHz.

[0034] Before communicating with the card, some cycles need to be delayed to satisfy the initialization of the memory card's internal status registers before initialization. For example, it can be delayed by 74 clock cycles, and of course, it can be delayed by more than 74 clock cycles as required. And the set clock cycle cannot exceed 1 millisecond.

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Abstract

The invention discloses an initial storage card method which first sets clock frequency by the storage card and sets time-delay period. It comprises the following steps: a. driving the corresponding pipe foot by the cheesed storage card working mode and sending initial order to the storage card; b. capturing the working voltage of the storage card and quoting weather the working voltage is fulfilling to the standard, if it fulfils the standard, it ascertains the catalog of the storage card and captures the identity and address information of the storage card; c. arranging the storage card to transmitting condition and capturing the condition information and ascertaining the type of the storage card by the condition information.

Description

technical field [0001] The present invention relates to the technical field of memory cards, and more specifically relates to a method for initializing a memory card. Background technique [0002] At present, there are more and more types of memory cards used in electronic devices such as mobile phones and digital cameras. The more common ones are Secure Digital Cards (SD Cards) and Multimedia Cards (MMCs). Among them, SD Cards include standard SD cards and SDIO cards. Wait. [0003] No matter what kind of memory card, it must be initialized before working. The initialization of the memory card is usually done by the card reader. When the card reader initializes the memory card, it first needs to determine the type of the card according to the working voltage of the memory card, and then obtain the CID information of the memory card. If the memory card returns the CID information, the card reader controls the memory card to enter the authentication State, that is, to obta...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): G06K17/00G06F12/00G06K19/07G11C7/00
Inventor雷波李晓强
OwnerVIMICRO CORP