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'[PIC:] Smart Media?'
2002\08\13@123246 by Harold M Hallikainen

picon face
Thanks Andy! I don't need to comply with the standard. In this
application, we're just looking for removable nonvolatile memory to hold
system configuration. The price and packaging of SmartMedia looks good,
thus my asking about interfacing. Are all these cameras, MP3 players,
etc. based on the processors you're suggesting?

In this application, there's a fair amount of user defined data that is
downloaded into the system from a PC. It seems that since the writing of
the media would only be when we're doing the download of data from the
PC, we could get around the big buffer requirement by passing it to the
card as it comes in from the PC. On the read side, we'll probably just
pull data from it during power up. Sequential access is probably fine.
We'd pull some data, send it to where it needs to go in the system, pull
some more data, etc.

I am using the 18f6620, so a fair amount of RAM is available, but I'd
like to avoid using it up on the Smart Media interface.

Right now we have the system designed using an I2C chip on a removable
circuit board. A little clunky and expensive, thus the look at Smart
Media.

THANKS for the info!

Harold


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2002\08\13@143042 by Barry Gershenfeld

face picon face
>Ok, I got it, MMC:
>
>http://www.compsys1.com/workbench/index.html
>
>Peter

Watch out, is MMC the same as SmartMedia?  The pictures
don't match.   SmartMedia has contacts on the top of
the module.  None of the MMC pictures show this.

Barry

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2002\08\13@143916 by James.Hyslop

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face
You might want to check out Amtel's DataFlash memory.. you can read and
write to it using serial SPI, and they have a package that is the same size
as MMC (multimedia card) memory.  This is NOT the same as SmartMedia from
what I understand.

James Hyslop




>Ok, I got it, MMC:
>
>http://www.compsys1.com/workbench/index.html
>
>Peter

Watch out, is MMC the same as SmartMedia?  The pictures
don't match.   SmartMedia has contacts on the top of
the module.  None of the MMC pictures show this.

Barry


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2002\08\13@164618 by Harold M Hallikainen

picon face
On Tue, 13 Aug 2002 11:18:36 -0700 Barry Gershenfeld <@spam@barry_gKILLspamspamZMICRO.COM>
writes:
> >Ok, I got it, MMC:
> >
> >http://www.compsys1.com/workbench/index.html
> >
> >Peter
>
> Watch out, is MMC the same as SmartMedia?  The pictures
> don't match.   SmartMedia has contacts on the top of
> the module.  None of the MMC pictures show this.
>

       The MMC (MultiMedia Card) is looking nice since it has an SPI interface.

Harold



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2002\08\13@175612 by Brent Brown
picon face
There are a range of controller chips from Toshiba that handle
SmartMedia and/or SD memory cards from this link:

http://www.toshiba.com/taec/cgi-
bin/display.cgi?table=Family&FamilyID=24

Had a quick look but I'm not sure how much of the work they do for
you. Pretty large packages too, but could be worth it if they provide
a higher level interface and reduce the complexity/size of the
resources required in your micro.

From what I know so far SD (secure digital) is a new variant of the
MMC (multi media card) format. Both are way different to SmartMedia.
SmartMedia looks like the best of the buch to me, (size, price, low
pin count, well defined & supported standard) but also seems to be
the more complex to interface.
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2002\08\13@195952 by Harold M Hallikainen

picon face
On Wed, 14 Aug 2002 09:52:39 +1200 Brent Brown <TakeThisOuTbrent.brownEraseMEspamspam_OUTCLEAR.NET.NZ>
writes:
> There are a range of controller chips from Toshiba that handle
> SmartMedia and/or SD memory cards from this link:
>
> http://www.toshiba.com/taec/cgi-
> bin/display.cgi?table=Family&FamilyID=24
>
> Had a quick look but I'm not sure how much of the work they do for
> you. Pretty large packages too, but could be worth it if they
> provide
> a higher level interface and reduce the complexity/size of the
> resources required in your micro.
>

       Thanks for the info? I'm seriously looking at MMC since it has a
built-in SPI interface. Still kinda complicated on the software side, but
I hope to figure it out.

Thanks!

Harold


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2002\08\14@134715 by Peter L. Peres

picon face
On Tue, 13 Aug 2002, Barry Gershenfeld wrote:

>>Ok, I got it, MMC:
>>
>>http://www.compsys1.com/workbench/index.html
>>
>>Peter
>
>Watch out, is MMC the same as SmartMedia?  The pictures
>don't match.   SmartMedia has contacts on the top of
>the module.  None of the MMC pictures show this.

The reason I said MMC: was that it is not smartmedia. However smartmedia
and MMC are comparable size and price-wise so I think it's a valid option.

What the 'top' of the card is, remains open to discussion imho.

Peter

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2002\08\14@134738 by Peter L. Peres

picon face
On Tue, 13 Aug 2002, Harold M Hallikainen wrote:

>On Tue, 13 Aug 2002 11:18:36 -0700 Barry Gershenfeld <EraseMEbarry_gspamZMICRO.COM>
>writes:
>> >Ok, I got it, MMC:
>> >
>> >http://www.compsys1.com/workbench/index.html
>> >
>> >Peter
>>
>> Watch out, is MMC the same as SmartMedia?  The pictures
>> don't match.   SmartMedia has contacts on the top of
>> the module.  None of the MMC pictures show this.
>>
>
>        The MMC (MultiMedia Card) is looking nice since it has an SPI interface.

Just be sure to check with the MMC card supplier that the ones you buy do
indeed have a SPI mode (or are 'fully compliant'). FYI there are CF cards
that skimp on some modes and as a result do not work in some projects (and
cameras, and adapters and ... been there, got the T-shirt etc).

Peter

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2002\08\15@101701 by miked

flavicon
face
No Smartmedis is not he same as MMC. Also some places are selling Secure Digital
as MMC(eBay) which are not compatible with the Compsys1 project.
> >> >http://www.compsys1.com/workbench/index.html
> >> >
> >> >Peter
> >>
> >> Watch out, is MMC the same as SmartMedia?  The pictures
> >> don't match.   SmartMedia has contacts on the top of
> >> the module.  None of the MMC pictures show this.
> >>
> >
> >        The MMC (MultiMedia Card) is looking nice since it has an SPI
> >        interface.
>
> Just be sure to check with the MMC card supplier that the ones you buy do
> indeed have a SPI mode (or are 'fully compliant'). FYI there are CF cards
> that skimp on some modes and as a result do not work in some projects (and
> cameras, and adapters and ... been there, got the T-shirt etc).
>

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