Re: New sub-$2.00 60MHz Piccolo C2000 Family from Texas Instruments

On Sep 11, 9:24 am, "Alex T." <a-tessar...@xxxxxx> wrote:
The CLA is actually fully programmble FPU. More details will be made
available over time.

Initially we will support the CLA with TI supplied algorithms (kind of
piece together software building blocks). Thats where the "hardcoded"
terminology came in (maybe not be the most appropriate terminology). Then
we will support full programmability with appropraite tools. Full
programmability may come out in conjunction with the hardcoded blocks or
soon thereafter, we are still working out details.

If this is not ROM based, then I would saw "hardcoded' is certainly the wrong terminology.

<snip>

The CLA itself is essentially a stripped down version of the FPU on our
F2833x devices and made it work independently of the C28 CPU. It can
directly access peripherals such as the ADC and PWM and respond to
interrupts directly without CPU intervention. You could almost say that the
Piccolo devices, with CLA, are dual core devices.

Surely it would be smarter to tell users that ? (when the software has
caught up, of course ;) )

This sounds more like the TPU scheme of Freescale ?

Q: How much memory resource does the CLA have (Code/Data/Flash/RAM) ?

Q: What Debug access to the CLA and Memory, is available in silicon ?

Q: What is the "interrupt jitter" of the CLA operating some example tasks ?

It seems a novel approach, as usually FPU has the widest latency of any operation, and thus many apps move that outside the tightest interrupts.

Q: How many Phases of PWM can the CLA/Peripherals manage ?

In power designs, above a certain power level, you need to start paralleling Mosfets, and it can make much more sense from a ripple and emc viewpoint, to run a lot of phases.
That can slash the ripple currents - so a few cents more on the Silicon,
pays back big time in smaller, cheaper capacitors.


The CLA in fact automatically shuts down when its task
is complete. Basically, performance and power are interdependent.

We have applications where we do just that and even though the data sheet
may specify a Max power number, it doesn't factor in the above. So
comparing power between devices is complex.

Then perhaps the industry needs a better benchmark ?
Something like a Joules/operation ?

-jg




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