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Gary, HDSDI Boards:

post #1 of 12
Thread Starter 
Gary, I decided to answer your PM publically as I want others to know the complexities in developing an HDSDI mod card.

1) Any BluRay or HD-DVD player candidates must be opened up to find the MPEG decoder chip in use.

2) Data sheets must be obtained for those chips.

3) An HD implementation is not going to be 10 simple wires. In all broadcast equipment I have looked at the data busses are not multiplexed. That means 10 bits Y and 10 bits pB and 10 bits pR (30 total). OR you could have 10 bits Y and 10 bits pB/pR (20 total). These must be multiplexed depending on the format they are in. That's an FPGA right there.

4) TRS? Is it included in the stream or not? If not it needs to be added in the above FPGA. Note that HDSDI TRS is more complex than SDI as line numbers are identified differently.

5) Polarity and timing of HVF signals. These will vary between players as well. Another member here back a couple of years back attempted to make a universal BT601 SDI card. He gave up due to the countless variations of HVF polarity and timing.

The FPGA front end will need to be programmed for each and every different HD-DVD or BluRay player. You could have several different configs burned in and select them via jumpers but this makes the FPGA even more complex in terms of timing issues - remember we are now at a 74mhz clock versus a 27mhz. So timing is 3 fold more critical. Large FPGAs at these speeds are not cheap. Also they tend to be in BGA packages requiring automated board stuffing - not cheap.

So an FPGA wil have to be developed for each and every player model. Now Verilog code can be cut and paste so it's not back to the drawing board each time but still involved a bit of R&D for each player model.

Unlike SDI, HDSDI has a much more limited market - that is CRT projectors. HDMI provides a suitable path for any current model digital projector so we won't see nearly as much demend for HDSDI.
post #2 of 12
thanks Glimmie, I was aware of most of that info, polarity and timing is something I have grown used to tweaking myself over the years, it isn't fun but once you find the config of a player you are good to go from then on

all the BD/HD players so far are 20 bits total separate luma and chroma, this is alot more work to do than a regular SDI mod, that is certain, HD-SDI will be more specialized and even less DIY versus SD-SDI

I have reports from quite a few videohpiles that HD-SDI offers a improvement over HDMI with any system including digital HDMI devices etc., although I agree with you in that the big sale is a nice high-end analog output from one of the top scalers

the only thing holding me back personally are suitable kits complete with everything like cable driver etc., building one is not for me as my area of knowledge doesn't go that far such as yourself, National has one called a evaluation kit that features a dual output driver

most importantly pixel magic isn't going to be realeasing a HD-SDI kit due anytime soon due to some reasons I won't disclose in the open

I may try one of those National EVK's pretty soon, not sure if Gennum has a similiar setup or not

thanks for the info, appreciate it

-Gary
post #3 of 12
Have you guys priced the HD-SDI transmitter chip? The Gennum chip costs about as much as the player it's going to go into.

Ron
post #4 of 12
Ron, well Gennum is out then , the ready to go National EVK developer kit is under 350$

-Gary
post #5 of 12
anything more to add Glimmie?

thanks

-Gary
post #6 of 12
For CRT user is better to use a HDCP remover before processor
post #7 of 12
HD-SDI with a high-end BNC analog output from say the vp50pro for example will be the best thing in the world for CRT

I can't wait to get it going myself personally

-Gary
post #8 of 12
Glimmie - can you edit this thread's title, as I think it would interest a lot more people if the thread was better named....
post #9 of 12
Thread Starter 
Quote:
Originally Posted by oferlaor View Post

Glimmie - can you edit this thread's title, as I think it would interest a lot more people if the thread was better named....

I don't know how to do that. I did change the title within my first post but I can't get to the thread title.
post #10 of 12
Glimmie, anything more to add

-Gary
post #11 of 12
Quote:
Originally Posted by Gary Murrell View Post

Ron, well Gennum is out then , the ready to go National EVK developer kit is under 350$
-Gary

Hi Gary,

I cannot find the National HDSDI EVK developer kit on the National website, could you please help me?

Thanks,
napp
post #12 of 12
napp, send me a PM

thanks

-Gary
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