The TUSB1044 supports up to two lanes (or 4 channels) of custom Alternate Mode at datarates up to 10 Gbps. TUSB1044 can be enabled for custom Alternate Mode through GPIO control or through I²C register control. Custom Alternate mode is not supported for GPIO mode which has AUX snoop disabled. When in GPIO mode, custom Alternate Mode is controlled based on Table 6-2. When not in GPIO mode, enable of custom Alternate Mode functionality is controlled through I2C registers. In I2C mode, the operation of this mode requires leaving AUX_SNOOP_DISABLE register 13h bit 7 at 0.