6.4.6.1.1 Software Requirement
A software write operation to ISC_CLKEN or ISC_CLKDIS requires double clock domain synchronization and is not permitted when ISC_CLKSR.SIP is asserted.
A software write operation to ISC_CLKEN or ISC_CLKDIS requires double clock domain synchronization and is not permitted when ISC_CLKSR.SIP is asserted.