awalls at radix
Apr 12, 2009, 6:20 AM
Post #4 of 9
Please don't top post. Thanks.
On Sun, 2009-04-12 at 01:00 -0400, Ben Gelb wrote:
> Hi Andy -
> I really appreciate this reply! Very helpful.
> I did find a datasheet via Google for the CX23416 which had pinouts
> and stuff, though it made no mention of loading firmware and stuff. I
> gather that this datasheet is supposed to be locked up tight though
> and maybe isn't supposed to be publicly downloadable
I'm not trying to scare-monger or be too uptight here, but I
recommend you keep yourself beyond reproach legally; it makes life
1. The document should be marked Copyright Conexant, so only Conexant
has legal rights to make and distribute copies. Don't redistribute the
document, as you don't have those legal rights (and likely don't have a
legal right to have the copy in your possession), under US law at least.
2. The document should be marked Conexant Proprietary as well. I'm not
sure of US law in this area, but I suspect dissemination of company
proprietary information is something for which a compnay can elect to
bring suit: another reason not to redistribute copies.
> - is it just as
> restrictive for the CX23417 and CX23418?
> I would love to see datasheets for either of those two.
You can contact Conexant about buying an EVK, which should come with a
reference board, and datasheets, and likely a legal agreement to sign.
The price may likely not be realistic for a hobbyist or school project
> On Sat, Apr 11, 2009 at 11:58 PM, Andy Walls <awalls [at] radix> wrote:
> > On Sat, 2009-04-11 at 17:17 -0400, Ben Gelb wrote:
> >> Perhaps this isn't the perfect forum for this question since its not
> >> really a software question, but I can't really think of any other. So
> >> sorry in advance if people find this to be "off topic."
> >> I'm interested in accessing the "encoded stream output interface" on
> >> the CX23416 (not the MCU/PCI interface!) and using it to drive some
> >> other digital logic (homebrew DVB-S transmitter).
> >> >From the CX23416 datasheet, it looks like I can just stream a TS out
> >> of this output port.
> > AFAIK, the CX23416 firmware does not produce a TS; just a PS, an MPEG 1
> > Stream, or PES's of various types.
> > I'm unsure about the CX23417's ability to produce a TS (I doubt it), but
> > it certainly has an output port of some sort, as it doesn't have a PCI
> > interface.
> > I know that the CX23418 firmware can produce a TS; the Linux cx18 driver
> > can tell the chip to do just that. The publicly available datasheet
> > also says that MPEG output can be supported on a 1-bit serial peripheral
> > interface. (Note, the linux cx18 driver doesn't configure that output
> > port; the driver only sets up MPEG streams to come the PCI bus.)
> >> Does anybody know if this port is physically accessible on any of the
> >> common capture cards?
> > I have no idea.
> > The ones you'd have the best shot at are cards with a CX23417. That
> > chip doesn't have a PCI interface. It has to clock the MPEG stream out
> > to a PCI bridge chip, so the MPEG stream should be accessable. Of
> > course, I have no idea if the CX23417 produces an MPEG TS. You'll have
> > to check the linux drivers that actually support boards with that chip
> > to try and get an idea.
> >> It's a bit unfortunate that the CX23416 is a BGA
> >> package, since it makes it hard (not really possible) to tack on
> >> wires.
> > Also the pinouts aren't publicly available.
> >> Any helpful suggestions appreciated.
> > 1. If this is a one-off project, I'd just use a CX23418 based card to
> > capture an MPEG TS. Then I'd use a homebrew piece of hardware to shift
> > it out a serial or parallel interface. You're going to have to stuff
> > the TS with NULL packets to get proper DVB-S rate adaptation correct
> > anyway (right?). (BTW who's transponder are you going to use? ;) )
> > With that, I think you'll spend less time on guessing at software
> > commands to get the output port configured and started, and also less
> > time guessing at pins and frying boards.
> > 2. If this is a serious project into which you'd like to invest a
> > non-trivial amount of $, then contact your regional Conexant sales rep.
> > Unless you get lucky figuring out the pins on a board with a CX23417,
> > anything other than 1 or 2 above is likely to be frustrating, and may
> > consume a lot of time and effort in the process.
> > Regards,
> > Andy
> >> Thanks,
> >> Ben
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