Hi tony
SW Loopback (SION) – the SION bit (SW Input On in IOMUXC_SW_MUX_CTL)
override the regular PAD functionality and forces the input path to
be active regardless of the value driven by the corresponding
module. It can be used for:
Loop Back - Module X drives the PAD and also receive PAD value as an
input. Required by I2C,SDHC modules.
GPIO Capture - Module X drives the PAD and the value is captured by GPIO.
Loop Back to module Y - Module X drives the PAD and module Y also receives
PAD value as an input. This can be used for driving module Y input without
connecting a real device on board.
Best regards
igor
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