Lpc2000

--- In lpc2000@yahoogroups.com, Rob Jansen <rob@m...> wrote:

> I do not believe these values anymore. Sandisk specifies for their 
> Extreme III cards *Min 20MiB/second* sequential read and write
> 
> This would mean 160 Mbits/second and that gives a 80 MHz clock.

How did you get that value?  160Mbits/second with the 4-bit 
interface means 40MHz clock, which means the enhanced cards either 
support higher than 25MHz clock, or they're remapping some of the 
pins for a wider data bus.  My assumption is they've just upped the 
clock rate to 40MHz.

> I tried this card on the LPC3000 with SD clocks (20, 26, 34 
> and 52 MHz). Can still read at 52 MHz but not write.

What speed do you get for reading at 52MHz, and what speed do you 
get for writing at 26 and 34MHz?  I'm assuming this is an extreme 
III SD card you're referring to?  They've obviously bent the rules 
for this card, but I can't find any product details as to what "ESP" 
means, do you have any idea?