technology4617 Posted July 7, 2017 Share Posted July 7, 2017 http://www.head-fi.org/t/740288/super-nintendo-spdif-dacs-and-you/15#post_11688810 I had the idea of using this PCB to implement a "normalized" SPDIF output on the Jaguar, but after looking at the SRC4192's datasheet, I'm a little confused as to how it works and whether it would work with the Jaguar's variety of oddball sample rates. Would any of the more technically-minded of you be able to comment on this? http://www.ti.com/lit/ds/symlink/src4192.pdf 1 Quote Link to comment Share on other sites More sharing options...
Zerosquare Posted July 7, 2017 Share Posted July 7, 2017 From a quick glance, the SRC4192 seems to support any input sample rate from 4 to 212 kHz, so it looks like it should work. However the digital audio input format is different: the SNES appears to use 16-bit right-justified, while the Jaguar uses 16-bit I²S. The latter is not supported by the SRC4192. So you'd have to add a bit of logic to do the conversion. You should also ask the guy who made the board to get his opinion. 1 Quote Link to comment Share on other sites More sharing options...
technology4617 Posted July 8, 2017 Author Share Posted July 8, 2017 The datasheet says the SRC4192 "supports I2S, Left-Justified, Right-Justified, and TDM Data Formats," so does the Jaguar output an uncommon form of serial audio or something? I'm not overly familiar with the different digital audio formats. Quote Link to comment Share on other sites More sharing options...
Zerosquare Posted July 8, 2017 Share Posted July 8, 2017 The SRC4192 apparently supports 24-bit I²S, but not 16-bit I²S, which the Jaguar uses. It's not particularly uncommon, it's just less popular than the left/right justified formats. 1 Quote Link to comment Share on other sites More sharing options...
technology4617 Posted July 8, 2017 Author Share Posted July 8, 2017 (edited) Is there any kind of simple "word length converter" IC available? I haven't been able to find anything with a quick search. EDIT: According to this guy, the converter does work with 16-bit i2s despite its absence from the datasheet. Weird. http://www.diyaudio.com/forums/digital-source/240007-16bit-i2s-48khz-source-src4192.html Edited July 8, 2017 by technology4617 Quote Link to comment Share on other sites More sharing options...
Zerosquare Posted July 8, 2017 Share Posted July 8, 2017 (edited) Try it out, then +5V -> 5V GND -> GND TXD -> SDIN SCK -> BCKI WS -> LRCKI +5V -> /RST Edited July 8, 2017 by Zerosquare 1 Quote Link to comment Share on other sites More sharing options...
technology4617 Posted July 12, 2017 Author Share Posted July 12, 2017 Thanks! I ordered the components (including a new Jaguar), so I should be able to test this in a couple of weeks or so. By the way, unrelated question: if you've ever had your hands on the official Jaguar SCART cables, do they use injection molded connectors for the console end? I just bought one that I was going to modify for composite sync, and I'm worried I made a horrible mistake. Quote Link to comment Share on other sites More sharing options...
sh3-rg Posted July 12, 2017 Share Posted July 12, 2017 You can't open those up, nope :/ Quote Link to comment Share on other sites More sharing options...
technology4617 Posted July 12, 2017 Author Share Posted July 12, 2017 Is the connector injection molded or just glued together? Quote Link to comment Share on other sites More sharing options...
Zerosquare Posted July 13, 2017 Share Posted July 13, 2017 They're injection-molded, so you can't open them cleanly. But they're made of a rubber that's soft enough to be cut with a box cutter, so you could open them that way and use electrical tape to seam them afterwards. Not pretty, but it works. Quote Link to comment Share on other sites More sharing options...
LinkoVitch Posted July 13, 2017 Share Posted July 13, 2017 Could you not perform the mod in the SCART end? Quote Link to comment Share on other sites More sharing options...
Zerosquare Posted July 13, 2017 Share Posted July 13, 2017 The composite sync pin isn't wired on official SCART cables (they use composite video instead), so it's only available from the Jaguar end. 1 Quote Link to comment Share on other sites More sharing options...
LinkoVitch Posted July 15, 2017 Share Posted July 15, 2017 Ah!, A dirty hack assuming the connectors can be found I guess would be a fingerboard like adaptor that plugs between the official SCART cable and the jag, and re-arranges the pins on the PCB edge. 1 Quote Link to comment Share on other sites More sharing options...
Zerosquare Posted July 15, 2017 Share Posted July 15, 2017 Not a bad idea. Suitable connectors are available from Digikey: https://www.digikey.com/product-detail/en/sullins-connector-solutions/EBC12DCWN/S3304-ND/927256 https://www.digikey.com/product-detail/en/sullins-connector-solutions/EBC12MMRN/S7331-ND/1922820 2 Quote Link to comment Share on other sites More sharing options...
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