52.6.5.2 Software Requirements
Writing to the ISC_CTRLEN or ISC_CTRLDIS register requires a double domain synchronization, so it is forbidden to write these registers when ISC_CTRLSR.SIP is asserted.
Writing to the ISC_CTRLEN or ISC_CTRLDIS register requires a double domain synchronization, so it is forbidden to write these registers when ISC_CTRLSR.SIP is asserted.