Ciao a tutti! Qualcuno ha un'idea delle temporizzazioni necessarie per le memorie MMC? Mi spiego meglio, qualcuno conosce il transfer rate per una scrittura continua su questi dispositivi? (riferendosi a una MMC "media" odierna, da 512MBytes).
Vorrei realizzare un datalogger, che abbia una banda di 150KBytes/sec in scrittura sulla MMC, e mi chiedevo se con queste memorie la cosa fosse fattibile o meno.
Ho visto che esistono scritture
-single block
-multiple block
-burst
Il dato che proprio non riesco a trovare da nessuna parte e' la durata di un trasferimento "single block" (512 bytes).
I don't understand Italian much but I think it would be best to ask the supplier, for example Lexar, for a detailed data sheet. This speed does not sound very high, should be possible.
Have you also considered SD cards? Supposedly they are really easy to communicate with and they are physically very small. Also, at least in the US you can almost buy them at every street corner.
I'm so sorry..... my intention was to post this on an italian newsgroup, but I unintentionally posted it here...I apologize....seems that I pushed the wrong button on my mailer.
Anyway, thanks for your answer,you exactly got the point :-)
I think it should be possible, too, because digital cameras seem to write data at a higher speed.
Concerning SD, is the specification publicly available like MMC or CF, or has to be purchased?
That's ok, I guess we are all pretty international in these newsgroups anyway. I bought a TV in Germany a long time ago. The manual was in Dutch/Danish/Swedish and the buttons on the front were marked in Italian. Oh well. Still works fine. When I read "Unita d'alimentazione" in an Italian schematic I somehow craved a nice Italian dinner...
Yes, mine writes a 1MB JPEG set in about a second or so but it uses an older Lexar flash card. Reading it down to the PC is even faster. A friend has one with an SC card and it also stores a whole picture of probably 2MB worth of compressed data in less than a second. You can even record realtime movies with it.
The manufacturers have that, along with application notes about more unusual writing schemes such as 1-bit wide writing. I would look at the mfg web site. You may have to contact them. Also, this topic is often discussed in great detail in micro controller newsgroups such as the Yahoo MSP430 group. There you can also get help if things don't want to work as expected.
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