6.2 DPLLs, DLLs Specifications

To generate high-frequency clocks, the device supports multiple on-chip DPLLs controlled directly by the PRCM module. They are of two types: type A and type B DPLLs.

• They have their own independent power domain (each one embeds its own switch and can be controlled as an independent functional power domain)
• They are fed with ALWAYS ON system clock, with independent control per DPLL.

The different DPLLs managed by the PRCM are listed below:

• DPLL_MPU: It supplies the MPU subsystem clocking internally.
• DPLL_IVA: It feeds the IVA subsystem clocking.
• DPLL_CORE: It supplies all interface clocks and also few module functional clocks.
• DPLL_PER: It supplies several clock sources: a 192-MHz clock for the display functional clock, a 96-MHz functional clock to subsystems and peripherals.
• DPLL_ABE: It provides clocks to various modules within the device.
• DPLL_USB: It provides 960M clock for USB modules (USB1/2/3/4).
• DPLL_GMAC: It supplies several clocks for the Gigabit Ethernet Switch (GMAC_SW).
• DPLL_DSP: It feeds the DSP Subsystem clocking.
• DPLL_GPU: It supplies clock for the GPU Subsystem.
• DPLL_DDR: It generates clocks for the two External Memory Interface (EMIF) controllers and their associated EMIF PHYs.
• DPLL_PCIE_REF: It provides reference clock for the APLL_PCIE in PCIE Subsystem.
• APLL_PCIE: It feeds clocks for the device Peripheral Component Interconnect Express (PCIe) controllers.

For more information on CM_CORE_AON and CM_CORE or PRCM DPLLs, see the Power, Reset, and Clock Management (PRCM) chapter of the Device TRM.

The following DPLLs are not managed by the PRCM:

• DPLL_VIDEO1; (It is controlled from DSS)
• DPLL_HDMI; (It is controlled from DSS)
• DPLL_SATA; (It is controlled from SATA)
• DPLL_DEBUG; (It is controlled from DEBUGSS)
• DPLL_USB_OTG_SS; (It is controlled from OCP2SCP1)