T2080 CGA_PLL1_RAT

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T2080 CGA_PLL1_RAT

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Contributor I

We are running SYSCLK at 100MHz. We are using PLL1 to drive the FMAN. We use Processor Expert to create the RCW. In the past I have been able to set CGA_PLL1_RAT to 7:1. But now it appears I cannot set it lower than 8:1. Did PE change to limit the value? The reference manual states 5:1 is allowed, but states look elsewhere (datasheet is assumed) to determine limitations.

In the datasheet, Table 121 discusses PLL frequencies. I may have missed the limitation there in the past as I assume it was for the Core frequency, does that require the CGA_PLL1 and CGA_PLL2 to meet a minimum of 1000MHz? 

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NXP TechSupport
NXP TechSupport

> does that require the CGA_PLL1 and CGA_PLL2 to meet a minimum of 1000MHz? 

Yes.

The Data Sheet requirements must be fulfilled - else normal processor operation is not guaranteed.

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