#apertus IRC Channel Logs

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hey ItsMeLenny!

i'm struggling with this time base corrector, it's taken me a long time so far because i made the parts as SVG for fritzing which took ages, but fritzing wasnt very good to use so someone told me to switch to kicad, and so now i've rebuilt the parts in that, and thats basically where i'm up to, laying out the schematic

that was the ADV chip, IIRC

i'm a bit confused how the P0 to P53 lines are meant to hook up http://www.analog.com/media/en/technical-documentation/data-sheets/ADV7800.pdf#page=18

well, the P0-53 are 54 digital outputs

ah, correction, P30-P53 are input ports

yeah

i only need with P0 to P29, or P20 to P29, the latter being ITU-656

i want 10 bit component output 4:2:2

" The Intensity Pro (non-4K0 only supports YUV 4:2:2, so as long s the YCrCb or YPrPb signal are YUV 4:2:2 they should work fine."

okay, you are talking about component video, yes?

im not sure what im meant to connect where :P

whoa :)

using their diagram but i reordered some pins

i dont need the digital input pins because they have analog input pins

yeah, those AIN1 through to AIN12 will have composite and svideo input

or P20 to P29, depending which i need to go with

P20 to P29 can be 10-Bit SDR ITU-656 Mode 1, and that ITU standard is 4:2:2 anyway

8-/10-bit ITU-RBT.656 4:2:2 YCrCb with embedded time codes and/or HS_OUT, VS_OUT, and FLD_DE_OUT pin timing

where do you see (in the datasheet) that it supports this?

and then page 23 in the table shows which pins are needed for DDR memory (and another page on 24 with the parrallel output)

but page 21 only shows parallel digital out

21 is for SDR

im going to use DDR on page 23

which means, it only transfers one bit per pin per clock

but you still need 8 pins (bits) to transfer the video

P29*

yeah, for 10bit you get P20-P29

ah, i thought it was something like that, ive never looked at ADC before do i thought maybe it would have just some straight up component out on it :P

well, hard to say, but as the chip support many different parallel modes, the best option would be to use an HDMI encoder

yeah i have HDMI input

that sounds easy enough

ah, i was going to use an arduino, a raspi might be wasier though

and I would suggest to go for the lowest clock rate and highest bit depth in the transfer

oh

all the modes on page 21/22 are parallel modes

21 and 22 are for SDR

ah

it just means that data is trasnferred only on the rising clock edge

no it's talking about what kind of memory it is using, because the ADC can either use SDR or DDR ram

page 16 talks about the features of using DDR ram and the feeatures of using DDR ram

yeah but im using DDR memory, so i cant get the SDR memory outputs

it is just coincidence that they are named similar

well i've been fooled all along then

SD* pins are the memory interface

the memory interface can handle SDR and DDR memory

yeah, which i'll use DDR otherwise SDR wont let me run two features at once

i never actually wouldve figured that out

ah, you want 10bit, so 30bit 4:4:4

e.g. the ADV7511

oh, so thats doing exactly what i was going to avoid of converting it back to analog

why is that a DAC when HDMI is digital

ah, no, you need the ADV7511, the 7513 can't do more than 24bit

let me check the price on it :P

oh yeah it is, probably about 50 from farnell australia lol, im gonna order everything from america i think

DAC :)

why doesnt those chips show up in http://www.analog.com/en/products/audio-video/video-encoders/video-da-converters.html

oh

ah

oh, heres part of the problem though, which is why i was going to stick on digital component

the intensity cannot do that?

maybe the updated it in this new interface

probably the best way is to connect both in a compatible pinout

ah

that 7511 spec sheet is quite short and useless :P

it is actually a brief

the new intensity pro 4K does deep colour, not sure about mine

sounds good then

im pretty sure the whole card does 10bit, but i never saw the words deep color

also note that 8bit RGB (4:4:4) gives way better quality than 10bit 4:2:2 YCrCb

yeah but intensity pro wont capture in 4:4:4 only 4:2:2 and this is coming from 4:1:1 vhs tapes anyway

The digital video interface contains an HDMI 1.4- and a DVI 1.0-compatible transmitter, and supports all HDTV formats <-- trying to find it, but does that still do SD

yeah

yeah, that shouldn't be a problem

its output formats are 36, 30, or 24 bit RGB 4:4:4 | 36, 30, or 24 bit YCbCr 4:4:4 | 24 bit YCbCr 4:2:2

as I said, 10bit is not really defined IIRC

ah

i'm guessing i should go with this 30Bit SDR 4:4:4 RGB mode

i.e. both 10bit 4:2:2 and 4:4:4 YCrCb

then you can always change the mode and test what works

if you want even more flexibility, get a cheap FPGA board with an ADC7511 onboard or as addon module and configure it in software to route the pins

hmm

yeah, probably getting out of my price range

do you have any FPGA development boards at hand?

i am really jumping in the deep end

im making a schematic for that chip

Thanks Bertl!

off for a nap ... bbl