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The GO operation writes to the RATIO field in the PLLDIVn. Registers do not change the dividers' divide ratios immediately. The PLLDIV dividers change to the new RATIO rates only during a GO operation. This section discusses the GO operation and alignment of the SYSCLKs.
The PLL Controller clock align control register (ALNCTL) determines which SYSCLKs must be aligned. Before a GO operation, program ALNCTL so that the appropriate clocks are aligned during the GO operation.
A GO operation is initiated by setting the GOSET bit in PLLCMD to 1. During a GO operation:
To help prevent errors, all device operation must be stopped before the GO operation.