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6670 spi nor 启动方式,如何在各table中配置PLL?



大家好:
               
                硬件平台:EVM6670,软件平台:CCS5.5
            1、boot parameter table中,需要配置MAIN PLL,涉及到三个参数:pll multipiler,pre-divider,post divider,这三个参数怎么确定cpu 主频,有具体的公式没,在什么文档中有提到?我只知道文档中有这公式:CLK = CLKIN × (PLLM+1) ÷ (OUTPUT_DIVIDE × (PLLD+1)) 
            2、在ddr configration table中,需要配置DDR PLL,也涉及到三个参数:pll pre div,pll Mul, pll post div,这三个参数怎么确定ddr频率,具体公式是什么,在哪个文档有体现?

            期待你们的解答,谢谢