Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Alif Semiconductor/AE302F80F5582LE_CM55_HE_View/IRQRTR/IRQRTR_CFG#0x0
IRQRTR Configuration Register
Number of shared interrupts supported by the IRQRTR:
426 (Val_0x1AA): 427 shared interrupts
Number of ICIs supported by the IRQRTR:
3 (Val_0x3): 4 ICIs
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https://github.com/cmsis-svd/cmsis-svd-data