SPRZ457H January 2021 – December 2023 AM2431 , AM2432 , AM2434 , AM6411 , AM6412 , AM6421 , AM6422 , AM6441 , AM6442
OSPI: OSPI0_LBCLK0 pin has input floating by default
The IO associated with the OSPI0_LBCLK0 pin has its receiver enabled, transmitter disabled, and internal pulls disabled by default after MCU_PORz is de-asserted. This default configuration allows the input buffer to float when there is no external component sourcing a valid logic state to the pin. This condition could potentially create a reliability issue for the input buffer if left in this state for long periods of time. The normal recommendation would be to connect an external pull-up resistor to the pin. However, this is not an option if the application plans to use the internal pad lookback clocking option for OSPI0. The OSPI0_LBCLK0 pin must not have any signal trace connected if the application plans to use the internal pad lookback clocking option. This connectivity requirement prevents the looped clock signal from being distorted (glitched) when it is sent out through the output buffer to the pin and looped back into OSPI0 through the input buffer.
Ensure the application software enables the internal pull via the PADCONFIG1 register as soon as possible to avoid a long term floating node if the application plans to use the internal pad lookback clocking option for OSPI0. Connect an external pull-up resistor to this pin if the application plans to use any other clocking option for OSPI0.