|Originally posted by Hyphen
I've been digging around in the SDI arena today - a few facts, a couple of questions...
Gennum makes some SDI chips, and better still, some evaluation boards. EB9022A carries the GS9022 serialiser (parallel to SDI); EB7005 carries the GS7005 SDI receiver (outputs SMPTE125M), and so on... The GS7032 serialiser also contains an NRZ to NRZI convertor, and a bypassable SMPTE scrambler... would that help in a DVD SDI application?
Now, the question: is a good 'ole Sony 7000 SDI-modifiable? The fact that I have one knocking around is instrumenntal in my asking...
Yes, the Gennum chip sets are widely used for SDI applications. You want to keep the NRZI and scrambling in place for standard SDI. They make these bypassable for non-video applications.
The National / Comm Linear chips are gaining popularity because of cost and availability.
Then there are the classic Sony and Thomson 1600 series chip sets. These are still very expensive and have margional perfrmance compared to the new Gennum and National offereings . They have a captive customer base though because they were widely used until Gennum got into the game in the mid 1990s and they fail often.
Don't know about the Sony 7000. For any device to be modified it must...
1) Have 27mhz clocked raw video data in 422 format with EAV / SAV added.
2) If it's not multiplexed and seperate y cBcR, you need to build a mux.
3) If EAV / SAV is absent you need to build logic to add that as well.
4) Be careful of loading the video data buss. I buffered mine right at the tack in points with a small sub board. Otherwise the players internal encoder was being killed by wiring reflections. (I wanted to keep the players normal outputs functional with SDI in use)
5) Fortunatly if you are Altera or Xilinx savy and have the tools, these are fairly easy logic circuits and most current FPGA's have the needed speed.