DRA790 Datasheet, PDF (166/436 Pages) Texas Instruments – Infotainment Applications Processor

DRA790, DRA791
DRA793, DRA797
SPRS968A – AUGUST 2016 – REVISED FEBRUARY 2017
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• 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.
NOTE
The following DPLLs are controlled by the clock manager located in the always-on Core
power domain (CM_CORE_AON):
• DPLL_MPU, DPLL_IVA, DPLL_CORE, DPLL_ABE, DPLL_DDR, DPLL_GMAC,
DPLL_PCIE_REF, DPLL_PER, DPLL_USB, DPLL_DSP, DPLL_GPU, APLL_PCIE_REF.
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_DEBUG; (It is controlled from DEBUGSS)
• DPLL_USB_OTG_SS; (It is controlled from OCP2SCP1)
NOTE
For more information for not controlled from PRCM DPLL’s see the related chapters in TRM.
5.9.4.3.1 DPLL Characteristics
The DPLL has three relevant input clocks. One of them is the reference clock (CLKINP) used to generated
the synthesized clock but can also be used as the bypass clock whenever the DPLL enters a bypass
mode. It is therefore mandatory. The second one is a fast bypass clock (CLKINPULOW) used when
selected as the bypass clock and is optional. The third clock (CLKINPHIF) is explained in the next
paragraph.
The DPLL has three output clocks (namely CLKOUT, CLKOUTX2, and CLKOUTHIF). CLKOUT and
CLKOUTX2 run at the bypass frequency whenever the DPLL enters a bypass mode. Both of them are
generated from the lock frequency divided by a post-divider (namely M2 post-divider). The third clock,
CLKOUTHIF, has no automatic bypass capability. It is an output of a post-divider (M3 post-divider) with
the input clock selectable between the internal lock clock (Fdpll) and CLKINPHIF input of the PLL through
an asynchronous multplexing.
For more information, see the Power Reset Controller Management chapter of the Device TRM.
Table 5-23 summarizes DPLL type described in Section 5.9.4.3, DPLLs, DLLs Specifications introduction.
DPLL NAME
DPLL_ABE
DPLL_CORE
DPLL_DEBUGSS
DPLL_DSP
Table 5-23. DPLL Control Type
TYPE
Table 5-24 (Type A)
Table 5-24 (Type A)
Table 5-24 (Type A)
Table 5-24 (Type A)
CONTROLLED BY PRCM
Yes⁽¹⁾
Yes⁽¹⁾
No⁽²⁾
Yes⁽¹⁾
166 Specifications
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