This connection caused some confusion here too. I initially thought it is used as a normal external interrupt leading me to believe all IRQn-DS pins can somehow be configured as normal interrupt pins. Figure 11.8 in the S7 manual suggest that a IRQn-DS pin is capable of triggering the related IRQn. So I used some of the DS pins because a lot of the real IRQ-pins are shared with other interfaces and only a few were available. But still unshure if this will work outside or without transitions to low power modes I used the IRQn-DS pins only for non essential features. It would be nice if someone can clarify if the DS pins can be used as "normal" external interrupt sources and how this can be configured in SSP.
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