The TUSB564 supports up to four DisplayPort lanes at datarates up to 8.1 Gbps. TUSB564 can be enabled for DisplayPort through GPIO control pin CTL1 or through I²C register CTLSEL1. When I2C_EN is ‘0’, DisplayPort is controlled based on Table 8-2. When not in GPIO mode, DisplayPort functionality is controlled through I²C registers. Data transfer through the DisplayPort lanes is further controlled by the HPDIN pin. DisplayPort needs to be enabled using CTL1 pin or CTLSEL1 register and also HPDIN needs to be pulled high for the DisplayPort data trasfer to be enabled through the DisplayPort lanes.