SPRUI30H November 2015 – May 2024 DRA745 , DRA746 , DRA750 , DRA756
The DPLL_SATA accepts the functional clock (SATA_REF_GFCLK) on its CLKINP pin (REF_CLK input at SATA SS level) directly from the device PRCM, without involving any DPLLCTRL_SATA interactions. The SATA_REF_GFCLK is derived from SYS_CLK1, and can be optionally software-gated by setting the PRCM.CM_L3INIT_SATA_CLKCTRL[8] OPTFCLKEN_REF_CLK bit. The status of the SATA_REF_GFCLK clock can be monitored in the PRCM.CM_L3INIT_CLKSTCTRL[19] CLKACTIVITY_SATA_REF_GFCLK bit. See Clock Domain Module Attributes in Power, Reset, and Clock Management.
If CLKINP signal is lost for some time, the LOSSREF output signal, which serves as a feedback to DPLLCTRL_SATA, is asserted high. When CLKINP resumes, the LOSSREF signal goes low (LOSSREF inactive state). The LOSSREF status signal can be monitored by software in the DPLLCTRL_SATA.PLL_STATUS[3] PLL_LOSSREF bit.