On Sep 26, 6:33=A0am, m <martin.use...@gmail.com> wrote:
> I am trying to select a uP to build into an embedded device. =A0Here are
> the requirements:
>
> - Run full Linux with MMU support
> - External bus support for more than 256MB of RAM, preferably DDR2
> - Support for 64MB+ of NAND FLASH
> - Support for 8MB of NOR FLASH
> - I2C (2 ports ideal, one is OK)
> - SPI
> - USB Host x2
> - 10/100 Ethernet
> - At least two serial ports, four even better
> - LCD interface highly desirable
> - 16 to 32 available parallel I/O pins
> - Expansion bus for external peripherals
> - Low cost
>
> Something like the Coldfire MC5329 would be perfect, except that this
> chip does not have a MMU and you are forced to use uCLinux, which I
> want to avoid due to the lack of memory protection and other
> limitations.
>
> I'd appreciate a shove in the right direction.
>
> Thanks,
>
> -Martin

Hi Martin,

low cost and full MMU support always rings an ARM9 bell with me. Ulf
has mentioned a couple devices from Atmel, there is also a LPC3250
from NXP.
Some useful links to data sheet and evaluation board for that device
can be found on the lpc website http://www.lpc2000.com

An Schwob

m <m...@gmail.com> writes:
> I am trying to select a uP to build into an embedded device.  Here are
> the requirements:
[...]

Several parts in the Atmel AT91SAM9 series seem to match your requirements.

> How large is your FPGA?
>
> With the AT91CAP9 you can have a dedicated
> bidirectional interface to an FPGA which then
> can be integrated into the built in 500k gate metal
> programmable logic block.
> Only limitation I can see is that you support 256 MB SDRAM/Mobile DDR.

This design is using one of the larger Virtex 5 chips (also
considering Stratix).

I'll have a look at the AT91CAP9 and see what I can determine.

I calculated that a Microblaze with the desired features would consume
about 10% of the FPGA, 15% at most.  That's not too bad.  I would
imagine that Nios would be about the same.

The only downside with Microblaze/Xilinx is that there is no USB
core.  You have to license it from a third party for about US$ 15K.  A
deal breaker unless the application is for very high volume (which
isn't our case).  Still, you can use external USB solutions from
Cypress or FTDI and make it work.

-Martin

Hi,

You can only get full linux on MicroBlaze today. (If you define "full" as 
2.6 kernel with MMU)
NIOS only support uclinux today.

Göran

"m" <m...@gmail.com> wrote in message 
news:6...@x16g2000prn.googlegroups.com...
>> How large is your FPGA?
>>
>> With the AT91CAP9 you can have a dedicated
>> bidirectional interface to an FPGA which then
>> can be integrated into the built in 500k gate metal
>> programmable logic block.
>> Only limitation I can see is that you support 256 MB SDRAM/Mobile DDR.
>
> This design is using one of the larger Virtex 5 chips (also
> considering Stratix).
>
> I'll have a look at the AT91CAP9 and see what I can determine.
>
> I calculated that a Microblaze with the desired features would consume
> about 10% of the FPGA, 15% at most.  That's not too bad.  I would
> imagine that Nios would be about the same.
>
> The only downside with Microblaze/Xilinx is that there is no USB
> core.  You have to license it from a third party for about US$ 15K.  A
> deal breaker unless the application is for very high volume (which
> isn't our case).  Still, you can use external USB solutions from
> Cypress or FTDI and make it work.
>
> -Martin
>
>
>
>
>