AVR-Chat

As I understand it MMC cards use an SPI interface on a 7-pin connector.
SD cards have a couple of additional contacts and have a 4-bit wide
interface. Do SD cards support the SPI mode of operation?
 
Brian
 
 
-----Original Message-----
From: Dave Mucha [mailto:dave_mucha@yahoo.com] 
Sent: 14 July 2004 04:42
To: AVR-Chat@yahoogroups.com
Subject: [AVR-Chat] Re: Fat16/32 info for AVR->compact flash


--- In AVR-Chat@yahoogroups.com, "Jesper Hansen" <jesperh@t...> wrote:
> 
> Did you also look at the capacities and prices, Dave ?   ;-)


Compac Flas is 256 meg for about $40.00 and the MMC is 256 meg for 
about $50.00  

the MMC only has about 6 pins for data while the CF requires 
considderably more lines.

The MMC and SD (Secure Digital) cards share the same form factor, but 
as I understand the SD cards are eclipsing the MMC cards.  A price 
check shows the SD 256meg for about $43.00 so is really close to the 
CF cards.

I guess the reason I was looking at the MMC/SD stuff was the small 
pin count and the large spacing for the pins.  the CF pins were too 
close together for my abilities to make a home brew board.

But, it looks like IBM ported their hard disk into the CF form so 
gigbytes will be available.