Electronics Projects, 32 GB EMMC Memory Micro SD card Connection article
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Hello friends. In this article, we offer you a while ago, I finished the handmade for 32 gb mmc card project page.
First of all, I want to talk about the structure of memory cards. As you know, the market is very different in structure and size, expandable memory unit’s profile is written in Dutch. One of the most known and used, SD (Secure Digital), MMC (MultiMedia Card), micro SD, mini SD, xD (Extreme Digital), CF (Compact Flash), MS (Memory Stick), and M2 cards.
Micro SD cards are small, simple structure, thanks to the structure and ease of use have become quite popular. Recently, resulting in almost every cell phone and mobile device supports this standard. The following links below to obtain more information about the memory cards.
Secure Digital (SD) Card Spec and Info
Except for the removable disks are still a part of the recently produced devices have embedded nand flash chips. IPhone, Nokia N95 8 GB, Nokia N97, a good example of this. Nokia N97 32 GB of internal memory as different from the others.
For more detailed information about the chip with a little research. A foreign site I found on the documents I quite easier.
n the image above links to the leg of the chip. Required under the wire solder, transmission lines to places microscope.
If you pay attention to the diagram given with the same name in more than one leg, but a lot of the same name in the link in the image above. Let me explain now why, I visited the same name is their legs on the chip in the United. So the voltage applied to a single point thanks to the ways others chip Vccq. Again, if you pay attention to the diagram, there are two feed named tip and Vcc Vccq. in fact, in the previous illustration is very clear. On-chip is separate from the mmc interface and core nand flash feeds
My card reader and standard mmc card is a single feed point out the problem can be solved by combining the two line, however, the problem in practice. That’s the way I figured it out but I’d like to specify that a healthy solution. Sudden voltage fluctuations, the static flow outs you may lose all of your data in case of a malfunction, or any other. To this day I have never had a problem like this, but it doesn’t mean I. ..