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microcontroller/dsp option

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I have a project, which request connect ethernet 10/100M. also need extra large flash, say 256MB. It must handle the TCP/IP, so it reqire some internal or external RAM? how much is that? the large external flash memory. I'm not sure which one is the cheapest and easest solution.
 

Probably one of the suitable solution is to use an 256MB SD/MMC card.

Look at this page for a board with AT91R40008 running at 73.728 MHz, 100 MBit Davicom Ethernet Controller, 256 kBytes full speed SRAM and 4 MBytes FLASH memory and obvious a SD socket for your 256MB storage requirement.
 

Did I miss the DSP requirement?
For the cheapest solution look for a device that does NOT have internal Flash because you will need a large external Flash anyhow, in this case internal Flash might just be waste of money.
You want to have the Ethernet on the microcontroller. While I am not so sure the R40008 is the best solution, I would also recommend an ARM9, e.g. the SAM9S9261, using an external Flash, external SDRAM and the big flash from an SD card hopefully for data and not for program execution.

Hope that helps a little, Bob
 

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