Re: Linux x uClinux for ColdFires: what is the best for what?

David,

I'm curious about this statement:

David Brown wrote:
> As for the V2 versus the V4 - you get more processing power for your 
> money with a V4, but more microcontroller-style peripherals with most 
> V2 devices, and a V2 board is going to be easier and cheaper to make.  
> But that depends on the sort of boards you are used to making.

What do you consider more MCUish that we've put on a V2 versus what 
we've put on a V4.  If you look at a part like the MCF5270 or MCF5208 
and the MCF54450, they are similar apart from the cores.

If you're thinking about single-chip flash devices, I agree, that the 
differences are greater.  We generally don't put ADCs on devices that 
run from SDRAM, because we usually can't afford the pins and customers' 
ADC requirements tend to vary widely.  Of course, if enough people ask, 
that is something that can change.

For systems that run from SDRAM, especially the double data rate 
varieties, I'm not sure there's a huge world of difference between the 
board design for something like the MCF5208 and for the MCF54450.

Both support DDR1 and mobile DDR (LPDDR) SDRAM.  The MCF5208 has 
dedicated DQ, DQS, and DM lines for the DDR while the address bus is 
shares among all memories.  The MCF54450 has a completely dedicated DDR 
bus, so I tend to think that board layout is of similar complexity for 
both.  Of course, the DDR clock on the MCF5208 tops out at 83.33 MHz 
(well, if you're not overclocking :-) vs. 120 (or is it 133) MHz for the 
MCF54450, so a little more attention to high frequency stuff is 
necessary for the latter.

Best regards,

John Bodnar
Systems Engineer
Microcontroller Solutions Group
Freescale Semiconductor, Inc.

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