[sdiy] Hardware convolution box?

[cheater00 cheater00]

All the SHARCs I looked at were discontinued. The Blackfins go up to ~half
the MMACS of SHARC (4.8 GMACS vs 2 GMACS) so I thought that Blackfin was
positioned as a replacement.

Good note on TI. I only focused on high power chips.

On Fri, 10 Feb 2017 05:09 , <rsdio at audiobanshee.com> wrote:

> Looks like all of the AD chips that you highlighted are Blackfin, not
> SHARC. The Blackfin is supposed to be a DSP, but it also can run general
> code like a full embedded Linux. I'm not really clear on how the Blackfin
> is differentiated from the SHARC family - perhaps someone here can
> elucidate? I do know that one of my clients designed a digital mixer with
> one Blackfin running Linux and two SHARC processors for audio. The Blackfin
> doesn't do any DSP at all, while the SHARC chips handle mixing and effects.
>
> Your spreadsheet only shows Texas Instruments C6000 family chips. That's
> certainly an excellent choice, but there are other lines like the C5000.
> I've designed with the C5500 family. It's more focused on low power. Since
> my product runs entirely on USB power, the C5500 was the right choice, but
> I was limited to fixed-point DSP. The C6000 has floating point abilities.
> There are also OMAP chips from TI that contain both an ARM core and a
> TMS320 DSP core. Those are hella expensive, though, and you have to write
> two pieces of firmware.
>
> As for the TI evaluation boards, some of them have an on-board JTAG
> adaptor, while others require that you buy or already have a separate JTAG
> adaptor. I haven't looked at the specific products you asked about, but
> perhaps the difference is in whether you need to provide a JTAG adaptor.
> Those can be expensive, and even the Chinese clones cost hundred$.
>
> Brian
>
>
> On Feb 9, 2017, at 4:09 PM, cheater00 cheater00 <cheater00 at gmail.com>
> wrote:
> > Found the right spot at the TI website. I've made a somewhat large
> > survey of AD and TI chips. I've uploaded the data to Google Docs (see
> > link at the end of this email).
> >
> > For a lot of power, TI can't be beat. Their chips are as cheap as
> > $0.78/GMACS, that's on TMS320C6678CYP, a chip with 8.5MB ram and 256
> > GMACS, $200 at Mouser.
> >
> > The cheapest TMS320C is TMS320C6652CZH6 with 19.2 GMACS, 1MB ram, at
> > $41.95 at Arrow.
> >
> > For cheap chips, AD is great. Their most powerful non-obsolete
> > offering is ADSP-BF561SKBCZ-5A, 2 GMACS, 328KB ram, $32.59 at Arrow,
> > for $16.30/GMACS. Some of their unusually cheap chips include:
> > ADSP-BF525BBCZ-5A, 1.2 GMACS, 132KB, $11.79 at Newark Element14 for
> $9.83/GMACS
> > ADSP-BF534BBCZ-4A, 1 GMACS, 134KB, $5.88 at Newark Element14 for
> $5.88/GMACS
> > ADSP-BF531SBBCZ400 0.8 GMACS, 53KB, $4.44 at Avnet for $5.54/GMACS
> >
> > Those chips were noticeably (3-4x) cheaper than their close
> > counterparts, apparently Newark and Avnet have some sort of blowout.
> >
> > I stopped surveying AD chips around 1.2 GMACS. There are going to be
> > much cheaper ones than I found, I guess, but they just have so many
> > chips I'd spend 2 days figuring out the prices. It's obvious: their
> > stuff is cheap.
> >
> > AD are inexpensive, but clearly, if you need a lot of processing power
> > and/or a lot of memory the TI will be 5 to 10 times cheaper. $200
> > might not be so much if that's the majority of the cost of the box for
> > a DIY gamer.
> >
> > As far as evaluation boards go, the highest-powered AD board seems to
> > be the best value. The TMDSEVM6678L costs $399 on TI's website, has
> > 64MB Flash, 512 MB DDR3 SDRAM, gigabit ethernet, usb mini-B, 80 IO
> > header and an AMC header with PCIe, an emulator port, a small FPGA for
> > configuration and booting, etc. See features at these two links:
> > http://www.ti.com/tool/tmdsevm6678#Technical%20Documents
> > http://www2.advantech.com/Support/TI-EVM/6678le_of.aspx
> >
> > I don't know if the USB can be used in host mode. Does anyone know?
> >
> > It is unclear to me which version of the chip this board has - the
> > 320GMACS one at 1.25 GHz or the 256 GMACS one at 1 GHz.
> >
> > Finally, there is a version of this board that costs $599 (50% more)
> > and it has an XDS560V2 emulation mode. I understand that's a debugger.
> > I don't know why exactly it is significant. What advantages does this
> > bring for a developer?
> > Is the emulator port shown on advantech's website only available in
> > this more expensive version? If the cheaper version also has it, what
> > can it be used for if the XDS560V2 emulation mode is not available?
> >
>
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