There are currently 6 unused pins on the 360 av cable, HDMI uses 5 lines to transmit the signal along the cable to the TV set and requires 11 signals input to the HDMI IC. The IC can be put between the 360 av out port and the TV set inside the actual av cable.
It requires these signals to transmit: VSYNC, HSYNC, S/PDIF, MCLK, IDCK, DE, D[23-0], RESET, I2C, INT, HPD thats 11 signals.
H-Sync, V-Sync already exist on the 360 output port so that leaves us with 9 signals minus 6 unused pins, that leaves 3 additional signals that dont have a path to travel.
Lets take out S/PDIF and MCLK, thats would be the audio, because we already have optical out on the AV cable, we dont need audio input to the HDMI IC.
Optical to S/PDIF i believe is very easy to do and that leaves us with one signal needed:
Well lets see lets take the reset signal for example: it could be either a low and toggle on high,
or a high and togle on low.
Either, or, I'm sure the logic is 3.3 V.
So for the reset it is plausable to rewrite the software to otput a steady 3.3 v signal on one of the audio channels. Or no signal then just a 3.3 v spike to toggle the reset.
The destinction between one of the audio channels being that or the reset signal, could be identified as simply as a switch like on the HDTV cable that comes with the Premium console.
USE VGA, USE COMPOSITE i think identifies between normal operation and hdtv operation for the AV signal.
When both are toggled could be as USE HDMI and send 3.3 v data down one of the audio channels.
Pinout of 360 AV cable:
http://www.engadget....a-vga-cable-fo/Sil 9190 HDMI IC:
http://www.siliconim...190_PB_0701.pdf
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Topic: HDMI Rumor Back and Shot Down by MS again (Read 174 times)