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Re: [Xylo-SDR] Firewire, DSP and FPGA on one module


another big problem with using C-incapable DSP chips is the fact that
once these are obsolete, it needs to be ported to the new processor.
C67x is a nice part. I use C64x in my day job and have used all the
other 16-bit fixed point TI parts too (I work for TI). If there were
free tools, I would have definitely prefered to use a C67xx part for
PIC-A-STAR, which would have given me more MIPS to do more interesting
stuff and also write everything with C.


On 12/18/05, Robert McGwier <rwmcgwier@comcast.net> wrote:
> The TMS320C6713B DSK comes with free development tools but you need to
> purchase the DSK.  I greatly prefer this chip to any of the
> alternatives.  You can get it to run at 300 MHz and draw very small
> power.  For most SDR applications,  you easily run entirely off on chip
> memory.  It runs fast in float modes.  The DSK, which comes with
> development tools  is $450 or so.   Lyle,  Howard Long (G3LVB),  Chuck
> Green (N0ADI),  Frank Brickle (AB2KT), and I are working on hardware and
> software using this part at its heart fir AMSAT SDR based transponders.
> The drawback to the free development tools with the DSK is that you hope
> you get a bug free version since it does not appear that they upgrade
> the freeware once you have installed.
> Cheers,
> Bob
> Ramakrishnan Muthukrishnan wrote:
> >On 12/18/05, Robert McGwier <rwmcgwier@comcast.net> wrote:
> >
> >
> >>The 16 bit fixed point DSP chip could be an issue which is dependent on
> >>how it is used.  Dealing with fixed point is an art few can master.  I
> >>..
> >>..
> >>This has 50K.  So that is a win plus it has the 18x18 multipliers.  All
> >>positives.  It is my personal opinion that we are better served at this
> >>time by mostly avoiding the use of DSP chips, especially fixed point
> >>ones and to rely on our ability to speedily process data on our modern
> >>desktops.  The SDR-1000 DSP core,  written by AB2KT and I,  recently was
> >>
> >>
> >
> >Bob,
> >
> >Everything agreed. But for those folks who are interested to see a
> >radio as a radio - packaged in a small box - DSP seem to be the only
> >way out as of now. Also there are some nice TI DSPs out there which
> >draws very less power, like the C55x for instance. If there were a
> >free toolchain available for them, I would have definitely choosen
> >them for a DSP-based SDR instead of the PIC-A-STAR that I am building
> >right now. There are very very powerful devices. If we have the luxury
> >of a powerful development environment like GNU/Linux and a free
> >toolchain which has a community behind it, nothing to beat it.
> >
> >--
> >   73, Ramakrishnan - VU3RDD
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> >
> >
> >
> --
> Laziness is the number one inspiration for ingenuity.  Guilty as charged!
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   73, Ramakrishnan - VU3RDD