What has faster data transfer, MMC or SD card?

[SolarTorch]

Re: MMC and SD

Is there anyone know MMC and SD card which one has a faster data transfer speed (read and write)?

 

[aNdreiBuuu]

Re: MMC and SD

I recommand you tu use Atmel data flash... h**p://w*w.atmel.com/dyn/products/product_card.asp?family_id=616&family_name=DataFlash%26reg%3B&part_id=1883

It's only 8MB but fast... and work on SPI bus like MMC&SD,

Another strategy is to use some static or dynamic ram and buffer data inside; when the process become noncritical, you have to save the buffer in sd card...
The best device for do this job is an FAST FPGA... SDRAM+FPGA (sdram core+spi core+glue logic)+SD Card = voyla you have a fast SD card...

Hope this help,
//a

 

[SolarTorch]

Re: MMC and SD

Thanks a lot aNdreiBuuu.
I want to know more about how fast the MMC and SD they are. Is there anyne can help?

 

[aslm]

Re: MMC and SD

SD is faster the MMC but it also depend on how the card is acceced. I was just searching for somthing simular and found this link, to a document describing just the speed of MMC/SD cards, it also was a great introduction to how you can acces them.

Understanding Secure Digital I/O Performance in Systems and Cards
https://www.windowsfordevices.com/files/misc/SDIO-whitepaper.pdf

re Me

 

[checkmate]

Re: MMC and SD

On paper, SD is faster than MMC. But in practice, transfer rates are most of the time limited by the reader itself.

 

[hamadeh]

Re: MMC and SD

SD is faster and more secure ...

 

[Qiwen]

Re: MMC and SD

MMC 4.0 is 52MHz x 8bit = 418Mb/s,
SD 1.1 is 50MHz x 4bit = 200Mb/s,
so, MMC 4.0 is fast than SD 1.1.