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PINOUT.md

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+# HDMI Pinout Mapping
+
+This document maps the 19 HDMI pins to the multiplexer channels.
+
+## HDMI Type A Connector Pinout
+1. TMDS Data2+
+2. TMDS Data2 Shield
+3. TMDS Data2-
+4. TMDS Data1+
+5. TMDS Data1 Shield
+6. TMDS Data1-
+7. TMDS Data0+
+8. TMDS Data0 Shield
+9. TMDS Data0-
+10. TMDS Clock+
+11. TMDS Clock Shield
+12. TMDS Clock-
+13. CEC
+14. Reserved (HEAC+ in 1.4)
+15. SCL (DDC)
+16. SDA (DDC)
+17. DDC/CEC Ground
+18. +5V Power
+19. Hot Plug Detect (HEAC- in 1.4)
+
+## Multiplexer Mapping (2x CD74HC4067)
+We use two 16-channel muxes.
+
+### Mux A (High Speed Data)
+- Channel 0: Pin 1 (Data2+)
+- Channel 1: Pin 3 (Data2-)
+- Channel 2: Pin 4 (Data1+)
+- Channel 3: Pin 6 (Data1-)
+- Channel 4: Pin 7 (Data0+)
+- Channel 5: Pin 9 (Data0-)
+- Channel 6: Pin 10 (Clock+)
+- Channel 7: Pin 12 (Clock-)
+
+### Mux B (Control & Power)
+- Channel 0: Pin 13 (CEC)
+- Channel 1: Pin 14 (Reserved/HEAC+)
+- Channel 2: Pin 15 (SCL)
+- Channel 3: Pin 16 (SDA)
+- Channel 4: Pin 18 (+5V)
+- Channel 5: Pin 19 (HPD)
+
+## Expected Diode Mode Values (General Guide)
+- TMDS Lines (1, 3, 4, 6, 7, 9, 10, 12): 0.3V - 0.7V
+- DDC Lines (15, 16): 0.5V - 0.8V
+- CEC (13): 0.6V - 0.9V
+- +5V (18): Usually high or varies depending on console (check for shorts!)
+- HPD (19): 0.6V - 0.9V
+
+*Note: Shields (2, 5, 8, 11) and GND (17) should be tied to common ground for the measurement.*