JAJSOK4D November 2021 – April 2024 TUSB2E11
PRODUCTION DATA
In I2C mode GPIO0 defaults to being an enable control for Carkit UART mode. GPIO0 is an active low signal to enable Carkit UART mode. GPIO0 is intended to be controlled through APU or SoC. When APU or SoC is not powered on or the firmware has not been loaded, the GPIO0 is low, enabling the UART mode to allow APU or SoC debug interface to be accessed through the USB port.
Default Carkit UART direction is DP → eDP (RX) and eDN → DN (TX).
On the rising edge of GPIO0, followed by TMODE_SWITCH, the TUSB2E11 enables and enters the default state. In the default state, the TUSB2E11 is ready to accept eUSB2 port reset, configuration or RAP. The repeater mode will be configured as host or peripheral depending on the eUSB2-defined configuration received from eUSBr and acknowledged by the repeater.
UART mode enable is controlled through GPIO0 after power up. This can be changed through UART_use_bit1_P1 bit in UART-PORT1 register, so UART mode enable can be controlled through a register instead of GPIO0.