AVR-Chat

I'm using Atmel's AT45DCB004 4MB DataFlash card, which actually uses an AT45DB321B internally. Although it is page based (528bytes/page) it has 2 RAM page buffers so you can be writing to one buffer while the other is being written to flash. You can interface directly with the AVR via SPI, it uses a standard 7 pin MMC connector and I've developed a very simple (1 regulator, 2 caps & 3 res) parallel port PC interface for downloading data.

As an example of storage capacity my application is storing a record every minute comprising a 7byte timestamp, 2x16bit integers and 5bytes of status, and I can fit 187 days worth of data into 4MB.

AndyC
http://pages.zoom.co.uk/andyc

--- In AVR-Chat@yahoogroups.com, Robert Adsett <subscriptions@a...> 
wrote:
> At 02:24 PM 7/16/04 +0100, you wrote:
> 
> >I'm using Atmel's AT45DCB004 4MB DataFlash card, which actually 
uses an 
> >AT45DB321B internally.  Although it is page based
> 
> Got an approx price for those Andy?
> 
> Robert


I put the number into Digi-Key and they want $ 17.09 for the 4 meg 
card and $ 27.95 (US) for the 8 meg version.

Quite expensive as compared to an MMC or SD or even a CF card.

A question arises about ease of use, both storing the data and then 
putting that into the PC.    

One of the things Andy mentioned is use of the parallel port.  As I 
am to understand, the future of the parallel port is bleak and that 
some laptops are not supplied with them now.

That means a USB might be a better interface, but that is a road on 
the other side of the forrest.

Dave
(starting to see the forest, trees, limbs, branches AND twigs)

At 02:24 PM 7/16/04 +0100, you wrote:

>I'm using Atmel's AT45DCB004 4MB DataFlash card, which actually uses an 
>AT45DB321B internally.  Although it is page based

Got an approx price for those Andy?

Robert

" 'Freedom' has no meaning of itself.  There are always restrictions,
be they legal, genetic, or physical.  If you don't believe me, try to
chew a radio signal. "

                         Kelvin Throop, III