Lpc2000

Sten wrote:
>
>Does anybody has some experiences in what data rate can be achieved when
>writing to an SD/MMC card? What is the bottleneck (software/FAT or SPI)?

Based on the user manual:
The minimum divider value on the SSP peripheral is 2.  You can run the
peripheral clock at CPU speed; 1:1.  The SD Card Max clock speed for SPI
mode is 25MHz.  So if you run the peripheral clock at 50MHz you can
potentially access the SD card at the maximum SD SPI frequency.

Some FAT implementations use less RAM and more ROM, some feature caching and
use quite a bit more RAM.  So depending on your requirements and budget you
have some optimizing options.


Joel