Ok, a AD/DA converter is in normal case good for processing measurement.
To be able to handle singals, there must be interfacing and matching
components for the input, and carfully select a ADDA converter for its
purpose. Then If the goad is two way signals, like VoIP, there must be
much CPU processing for echo canceling and sample rates as well, and I
think a DSP would be better to use than a real time TS7200 system,
however it is possible to process voice in this kind of system but might
not be optimal.
/PO
anand bhavnani wrote:
> hello all,
>
> jesse your mail was enlightening.
> sees you have a lot of experience with TS boards
> i am an engineer and my final semester project is to develop a VoIP
> Phone, and i am using TS-7250 for that purpose
> i had opted for it considering that MAX 197 would provide proper voice
> support, but as we discussed, its not that great for it... then
> why(for what applications) has technologic system put it on the board..
> have i made a mistake by going for this particular board for my
> particular application
>
> good bye,
> //anand.
>
>
>
> */Jesse Off <>/* wrote:
>
> --- In anand bhavnani <> wrote:
> >
> > As u have mentioned the processor handles flash through the cpld and
> additionally cpld perfoms several other functions.
> >
> > so can i assume that the cpld is on the board primarily because the
> processor in itself is not having a controller (like uart
> controller,VEC. INT. ,...etc) that could have effectively interfaced
> with the flash and hence the need for cpld arose.
>
> no. IMHO, having dedicated "NAND flash controller" pins implemented
> on a CPU would only serve to waste pin real-estate on the CPU package.
> Interfacing NAND flash chips isn't rocket science (Its implemented in
> just a 72-macrocell CPLD after-all) The CPLD already is needed and
> cost-justified for other duties it has on the board, so we really got
> NAND support for "free". If it were on the Cirrus CPU, we'd be paying
> Cirrus for that (imaginary) NAND interface on every TS-7xxx board
> whether or not we actually even had a NAND chip in the design. When
> it comes down to it, the SMC bus is perfectly fine for NAND flash
> chips.
>
> Almost all of the boards we design have a CPLD (or an FPGA such as the
> TS-7260 or TS-7300) on them and only the TS-7250 and 7260 have NAND
> flash chips. It gives much design flexibility and helps to keep the
> number of discrete chips low. We also can custom program the CPLD for
> customers with special needs without having to do a (more expensive)
> board redesign. (e.g. DIO pins that do quadrature or PWM instead of
> just regular in/out)
>
> Also, there is subtle "secret sauce" in the CPLD code that deters a
> casual Joe Engineer from using the published schematics to
> remanufacture or create new CPLD code for themselves. Or at least one
> that will work reliably. Likely, a wrong CPLD load would even cause
> boards to self-destruct in very unique ways. TS reserves this CPLD
> code, the PCB gerbers, and full schematic details for customers who
> license the design while releasing most of the rest to the public
> domain.
>
> Usually, getting sound is best approached with a $10 USB sound dongle.
> Using the CPU to simultaneously sample the ADC at 10-40 KHz, feed a
> raw DAC chip and run Linux or any other type of processing is just
> asking for trouble. Such a job is cake for a DSP, but a general
> purpose CPU running an operating system really likes more hardware
> help than the typical raw ADC/DAC provides. (for instance, FIFO's and
> a sampling clock generator)
>
> //Jesse Off
>
>
> >
> > also please suggest a DAC that i may use to provide the sound
> support to the board considering the fact that i am using MAX197 12
> bit ADC.
> >
> > thanks,
> > //anand.
> >
>
>
>
>
>
>
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