On our i.mx6DL based design, we have the following IOMUX settings for UART2:
UART2_RX ----> goes to PAD SD4_DAT4
UART2_TX ----> goes to PAD SD4_DAT7
The routing from signal to pad is easy...just set the following MUX registers:
37.3.208 Pad Mux Register (IOMUXC_SW_MUX_CTL_PAD_SD4_DATA4) ---> ALT2
37.3.211 Pad Mux Register (IOMUXC_SW_MUX_CTL_PAD_SD4_DATA7) --->. ALT2
So far so good.
Now, since these two signals (UART2_RX and UART2_TX) can be driven by different PADs, we need to use a select input register. The problem is that there is a UNIQUE input register for the two signals. Specifically:
IOMUXC_UART2_UART_RX_DATA_SELECT_INPUT (section 37.3.572 in the user manual) (See picture)
So how can we correctly select the input for these two signals?
Thanks a lot