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Public Version
Preinitialization
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NOTE:
•
The sys_clkout output clock cannot be provided to peripherals when the core is off.
•
The sys_clkreq output signal switches the system clock on or off.
•
After power-on reset (POR), the hardware configuration enables the internal oscillator
(assuming that the input clock comes from a crystal). The decision whether to bypass
the internal oscillator is controlled by the polarity of the sys_boot[6] pin.
describes the power pins.
Table 26-1. Power Pins
(1)
Device Voltage Pin Name
Description
vdd_mpu_iva
MPU and image and video accelerator (IVA) subsystem power supply
vdd_core
Core power supply
vdds_io
I/O power supply
vdds_mem
Memory, SDRC, and GPMC I/O power supply
vdda_wkup_bg_bb
Input power for wakeup, band gap and body bias low-dropout regulators (LDO)
vdda_sram
Input power for SRAM LDOs (common)
vdda_dplls_dll
Input power for digital phase-locked loops (DPLL) and delay-locked loop (DLL)
vdda_dpll_per
Input power for DPLL (peripheral)
vdda_csiphy1
Dedicated power supply for camera serial interface2 - CSI2a complex I/O
vdds_csiphy2
Dedicated power supply for CSI2b complex I/O
vdda_dsi
Dedicated power supply for display serial interface (DSI) complex I/O
vdda_dac
Video buffers and digital-to-analog converter (DAC) power supply
vdds_sdmmc1
Power supply for multimedia card (MMC)/secure digital (SD) dual voltage buffers
vpp
eFuse programming voltage
pop_ddr_vdd_ft
POP DDR core supply
(1)
pop_flash_vdd_ft
POP FLASH core supply
(1)
pop_flash_vpp_ft
POP FLASH vpp supply
(1)
(1)
The package-on-package (POP) device provides feedthroughs from the bottom of the package to the POP interface. Among
these feedthroughs (FEEDTHROUGH balls), several provide power to the top memory device. The correct power supply to the
feedthroughs must be provided based on memory requirements.
For more information about power management, see
, Power, Reset, and Clock Management.
3512
Initialization
SWPU177N – December 2009 – Revised November 2010
Copyright © 2009–2010, Texas Instruments Incorporated