Lpc2000

Peter Jakacki wrote:

>Arrhhh, if only it had a bootloader that could load from SD memory cards 
>into internal RAM and then a secondary bootloader could then perform the 
>high-level boot into external RAM. Having to implement parallel Flash 
>means more chips/cost/space etc when the code would be quite happy to 
>run out of RAM. Do you think that Philips will do this or does anyone 
>know of an ARM that does?
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Yes, look at the Cirrus EP930x (EP9301, EP9302, ...).  That family boots 
from an SD Flash memory, it pulls in a small amount of code from the SD 
memory (if it exists), from that little code, you can init SDRAM and 
pull in larger code from the SD Flash, eventually you will have your 
bootloader (with file system support) loaded.

This is one downside of the LPC2000 series, it relies very heavily on 
BIG Flash and small SRAM,  I'd like to see an LPC2000 chip with 512K of 
SRAM and 32K of Flash!  Couple that processor with an SD Memory Card and 
you've got one heck of an ARM system in a tiny footprint!

TomW

>Maybe I'm jumping the gun because looking at the block diagram I see 
>that the SD and SPI are running off the same slave bus as the NAND Flash 
>controller. Could it be that the bootloader allows a variety of devices 
>to be used???
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>Plus, the BGA is always a pain for protos but it is the way many chips 
>are going if you want the features. On the upside the power consumption 
>looks modest for a 208MHz optioned-up ARM9.
>
>Thoughts?
>*Peter*
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>elektrknight wrote:
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>> A bit more LPC3180 details in the data sheet at Philips website:
>>http://www.standardics.philips.com/products/lpc3000/pdf/lpc3180.pdf
>>    
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>Yahoo! Groups Links
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-- 
Tom Walsh - WN3L - Embedded Systems Consultant
http://openhardware.net, http://cyberiansoftware.com
"Windows? No thanks, I have work to do..."
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