HDMI 2.1 uses Fixed Rate Link (FRL) signalling at up to 48 Gbps to support 4K 120Hz, 8K 60Hz, 10K resolution, Variable Refresh Rate (VRR), Auto Low Latency Mode (ALLM), and Enhanced ARC (eARC) for gaming and home theatre.
| Pin | Name | Function | Type |
|---|---|---|---|
| 1 | TMDS D2+ | FRL lane 2 positive | BUS |
| 3 | TMDS D2- | FRL lane 2 negative | BUS |
| 4 | TMDS D1+ | FRL lane 1 positive | BUS |
| 6 | TMDS D1- | FRL lane 1 negative | BUS |
| 7 | TMDS D0+ | FRL lane 0 positive | BUS |
| 9 | TMDS D0- | FRL lane 0 negative | BUS |
| 10 | TMDS CLK+ | FRL clock positive | BUS |
| 12 | TMDS CLK- | FRL clock negative | BUS |
| 13 | CEC | Consumer electronics control | BUS |
| 17 | GND | DDC and CEC ground | GND |
| 18 | +5V | 5V power 50mA | PWR |
| 19 | HPD | Hot plug detect | I/O |
HDMI 2.1 uses Fixed Rate Link (FRL) signalling at up to 48 Gbps to support 4K 120Hz, 8K 60Hz, 10K resolution, Variable Refresh Rate (VRR), Auto Low Latency Mode (ALLM), and Enhanced ARC (eARC) for gaming and home theatre.