SD snd SDHC card differences
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From: larwe on 1 Jan 2010 11:55 On Jan 1, 9:34 am, "Joe G \(Home\)" <jo...(a)optusnet.com.au> wrote: > Yes, but what are the technical "executive summary" between the two > standards? The executive summary is a PowerPoint presentation that says "SDHC newer, different logo fees apply". Right under that is a second bullet point that says "SDXC obsoletes SDHC". > What are the protocol differences? Mainly addressing mode changes so that larger cards can be supported. Yes in general an SD implementation can be upgraded to SDHC by software only. Also microSD to SD adapters are passive, so yes they are identical apart from form factor (no write protect switch on microSD)
From: Joey.G on 1 Jan 2010 11:57 On Jan 2, 3:55 am, larwe <zwsdot...(a)gmail.com> wrote: > On Jan 1, 9:34 am, "Joe G \(Home\)" <jo...(a)optusnet.com.au> wrote: > > > Yes, but what are the technical "executive summary" between the two > > standards? > > The executive summary is a PowerPoint presentation that says "SDHC > newer, different logo fees apply". Right under that is a second bullet > point that says "SDXC obsoletes SDHC". > > > What are the protocol differences? > > Mainly addressing mode changes so that larger cards can be supported. > > Yes in general an SD implementation can be upgraded to SDHC by > software only. > > Also microSD to SD adapters are passive, so yes they are identical > apart from form factor (no write protect switch on microSD) Great thanks. I see the short form version of the SD specification has been released but not the SDHC, as I could not find it anywhere. Joe
From: larwe on 1 Jan 2010 20:28 On Jan 1, 12:04 pm, dalai lamah <antonio12...(a)hotmail.com> wrote: > > 2. microSD is the same as SD except the microSD is physically smaller. > > The only remarkable difference that I know is that the support of SPI mode > (which is very handy for small microprocessors applications) is only > optional for microSD. This is true but in practice I have never seen one that took advantage of this. They appear to be identical dice in different packages. Some of the Chinese SDHC cards I've bought are in fact bonded onto a PCB that can be cut in one place as microSD and one place as SD form factor :)
From: larwe on 1 Jan 2010 20:59 On Jan 1, 11:57 am, "Joey.G" <jjoey.g...(a)gmail.com> wrote: > I see the short form version of the SD specification has been released > but not the SDHC, as I could not find it anywhere. SD (all flavors) is a buyware spec, gotta pay to join the club. But of course you can find everything you need by browsing around the Internet, it's just a matter of collating it all.
From: dalai lamah on 2 Jan 2010 07:25
Un bel giorno larwe digit�: >> The only remarkable difference that I know is that the support of SPI mode >> (which is very handy for small microprocessors applications) is only >> optional for microSD. > > This is true but in practice I have never seen one that took advantage > of this. Then I must be very unlucky, I tried with a single microSD and it didn't work. :) I don't remember the brand now. It could be Sandisk but I may be mistaken. -- emboliaschizoide.splinder.com |