[fpc-devel] BBB / PRUS / M3 and fpc

Mark Morgan Lloyd markMLl.fpc-devel at telemetry.co.uk
Tue Dec 3 11:16:37 CET 2013

Michael Schnell wrote:
> To whomever is interested:
> On 07/05/2013 02:11 PM, Michael Schnell wrote:
>> Reading the AM3359 Docu (this is the BBB's chip) it has an "Arm Cortex 
>> M3 Subsystem" (other then the predecessor AM17xxx that had a PRUS with 
>> a TI propriety CPU design). So it seems to be "a standard Cortex-M3 
>> core".
> I finally found out the truth.
> While it is correct that
>  - the 335x chip has a coprocessor system called "PRUS"
>  - the "PRUS v2" is greatly upgraded vs the AM17xxx "PRUS v1"
>  - a coprocessor in the 335x system is a Cortex M3
> it is not true that the PRUS processor is a Cortex M3.
> In fact it is a dedicated, propriety architecture by TI and can only be 
> programmed in ASM. It is very similar to the AM17xxx PRUS but has more 
> RAM and more closely coupled peripherals.

Thanks for that, interesting. So the important point from the POV of the 
casual hacker or small business is that none of the BeagleBoard products 
have ARM-based PRUs.

Mark Morgan Lloyd
markMLl .AT. telemetry.co .DOT. uk

[Opinions above are the author's, not those of his employers or colleagues]

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