SPRUIE9D May 2017 – May 2024 DRA74P , DRA75P , DRA76P , DRA77P
Only the DPLL_SATA output, CLKDCOLDO, is used to provide the high-speed clock at the PLL_CLK pin of the SATA_PHY. Only the REGM, REGN, and SD divider values are used within the DPLL clock generator subsystem to adjust the CLKDCOLDO output clock frequency. This is done by programming the DPLLCTRL_SATA.PLL_CONFIGURATION1[20:9] PLL_REGM, DPLLCTRL_SATA.PLL_CONFIGURATION1[8:1] PLL_REGN, and DPLLCTRL_SATA.PLL_CONFIGURATION3[17:10] PLL_SD bit fields, respectively. The SATA DPLL CLKOUT and CLKOUTLDO outputs are not used, and internal REGM2 and REGM1 dividers are not software controllable.
At the DPLL/PLLCTRL integration level, the PLL_REGM1[3:0] and PLL_REGM2[6:0] divider control signals are tied-off by hardware to 0x0 and 0x1, respectively.
For more details on output clock settings sequence, see Section 28.1.4.3.7.2, SATA DPLL Clock Programming Sequence.