Re: New ARM Cortex Microcontroller Product Family from STMicroelectronics


"Bill Giovino" <contact1@xxxxxxxxxxxxxxxxxxx> wrote in message news:wPqdnfD32sqW1uXbnZ2dnUVZ_vWtnZ2d@xxxxxxxxxxxxxx

"Simone" wrote...
On 19 Giu, 11:40, Jim Granville wrote:
Bill Giovino wrote:
http://www.microcontroller.com/news/arm_cortex_stm.asp

It now says:

"The disadvantage of a Harvard Architecture microcontroller is that because
instruction and data memory do not share the same PHYSICAL bus, there
can be a reduced level of flexibility in the hardware for some applications."

That's incorrect. All Harvards have a connection between the instruction and
data memories. On micro controllers this is a direct physical connection as
you need a way to read constant data from flash. On cached cores both
I&D caches connect to the same main memory bus.

So I'm not sure what you mean with reduced hardware flexibility? The only
drawback some Harvards have is not automatically supporting self modifying
code, but that is a software issue and only applies to cached cores.

Finally, where did you get the idea that Luminary is owned by ARM?
ARM's investment in Luminary is only minimal - ask them or read ARM's
annual reports. It would be better if you sticked to the facts rather than just
make up exciting stories...

Wilco


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