Re: Atmel AVR CAN

From: Jim Granville (no.spam_at_designtools.co.nz)
Date: 05/01/04 

Date: Sat, 01 May 2004 22:07:22 +1200

Johnny wrote:
> On Thu, 29 Apr 2004 17:15:04 +0200, "Ulf Samuelsson"
<snip>
>>>I would like about 1MB Flash and 256kB RAM.
>>
>>Unfortunately, that is "indecent" with current 0,18u Embedded Flash process.
>>I think that you will see devices with USB + CAN and 256 kB Flash quite
>>soon.
>>(AT91SAM7A3 will arrive this year).
>>
>>
>>Atmel has ARM7 + USB for large volume ASSP customers.
>>
>>You could try the ARM9 (AT91RM9200) which of course needs external
>>flash/SRAM.
>
>
> Thanks for the info. But how come there are other AT91 chips with 2M
> Flash and 256KB RAM?

These are dual die solutions in BGA packages. See my other post about
Intel also making stacked-die XSCALE (ARM) pocessors for Cell Phones.

>
> Basically I am looking for a highly integrated and low-cost solution.
> I think a SOC approach is a great from a reliability and manufacturing
> point of view. External SRAM also tends to be expensive especially
> towards the end of its production life a few years from now, which
> could become a problem for us.
>
> I need a lot of flash for storing about 400KB of configuration data.
> So an external Flash might be a decent solution.

  Serial FLASH is getting quite cheap, and there are ARM uC from Philips
and STm with 256K bytes FLASH and 64K Bytes of SRAM, which I would have
called 'quite a lot' in a single chip device.
  Of course, one designers' "Quite a lot" is anothers "not nearly enough" :)

  Why do you need 256K Bytes of RAM ?

-jg

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