}/*Select PLL as system clock source*/RCC->CFGR0 &= (uint32_t)((uint32_t)~(RCC_SW)); RCC->CFGR0 |=(uint32_t)RCC_SW_PLL;/*Wait till PLL is used as system clock source*/while((RCC->CFGR0 & (uint32_t)RCC_SWS) != (uint32_t)0x08) { } }else{/** If HSE fails to...
#include"bsp_clkconfig.h"voidUser_SetSysClock(void){/***//* PLL (clocked by HSE) used as System clock source *//***/__IOuint32_tStartUpCounter =0, HSEStatus =0;/* 复位RCC的所有寄存器 */RCC_DeInit();/* Enable HSE *//* ...
SYSTEM_SYNCHRONOUS attempts to compensate all clock delay while SOURCE_SYNCHRONOUS is used when a clock is provided with data and thus phased with the clock. 指定输入时钟的PLL相位补偿。 SYSTEM_SYNCHRONOUS尝试补偿所有时钟延迟,而当时钟被提供数据并因此与时钟定相时,使用SOURCE_SYNCHRONOUS。 BANDWIDTH:默认...
• Do not leave the unit in a location near a heat source such as a radiator or airduct, or in a place subject to direct sunlight, excessive dust, mechanical vibration, or shock. • Do not place the unit on surfaces (rugs, blankets, etc.) or near materials (curtains, draperies)...
synchronization VCO = 2949.12 MHz Dual Loop (2) 4 CML 32 mA clocks in bypass 3 LVDS clock /12 4 SYSREF as LCPECL 3 SYSREF as LVDS 1.5 3 mA 930 1120 mA ICC_JESD204B_LOW Supply Current for JESD204B use case during JESD204B steady state while holding SYSREF as low in DC coupled ...
because both dc-to-dc converters and LDOs look like noise sources. The LDO data sheet usually shows a noise spectrum density that will affect noise-sensitive parts such as PLLs (see Figure 3). Choose a low-noise power source for the PLL, especially to supply the core current of the VCO...
1. Although the MPLL starts just after a reset, the MPLL output (Mpll) is not used as the system clock until the software writes valid settings to the MPLLCON register. Before this valid setting, the clock from external crystal or EXTCLK source will be used as the system clock directly....
To find out the settings of PLL, invoke the Clocking Wizard from the CORE Generator interface and provide the source clock frequency. Also, configure the Clocking Wizard to generate five outputs: four outputs required for the default design of MIG, and the fifth output as the...
The frequency dividers in this system can also increase the input frequency as high as the system capacity allows. This is the principle used in the TI Audio Devices Clocking Scheme. 3 PLL and Clocks Distribution Tree in Audio Devices In general terms, an audio device requires of a clock ...
Termination for an LVDS Reference Clock Source LVPECL Ref Clk 0.1 PF 0.1 PF 100: Trace (Differential) CLKinX/ OSCin 0.1 PF 0.1 PF LMK046XX CLKinX*/ OSCin* Copyright © 2017, Texas Instruments Incorporated Figure 20. Termination for an LVPECL Reference Clock Source 28 Copyright © 2017–...