SPRUI30H November 2015 – May 2024 DRA745 , DRA746 , DRA750 , DRA756
The DPLL_PCIE_REF can be set in different modes during operation. PRCM triggers DPLL_PCIE_REF state transitions to different static modes by setting the bit field of the PRCM.CM_CLKMODE_DPLL_PCIE_REF[2:0] DPLL_EN. Automatic state transitions could be enabled if corresponding bits in PRCM.CM_AUTOIDLE_DPLL_PCIE_REF register are set. The DPLL_PCIE_REF then can automaticly enter the low power condition as follows:
If PRCM.CM_AUTOIDLE_DPLL_PCIE_REF[2:0] AUTO_DPLL_MODE is set to 0x0 - automatic control is disabled.
If PRCM.CM_AUTOIDLE_DPLL_PCIE_REF[2:0] AUTO_DPLL_MODE is set to 0x1- The DPLL is automatically put in Low Power Stop mode when its DPLL generated clocks are not required anymore. It is also restarted automatically.
If PRCM.CM_AUTOIDLE_DPLL_PCIE_REF[2:0] AUTO_DPLL_MODE is set to 0x5 - The DPLL is automatically put in Idle Bypass Low Power mode when its DPLL generated clocks are not required anymore. It is also restarted automatically.
For more information see Power, Reset, and Clock Management.