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