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CCM_ANALOG_PLL_*** registers and POWERDOWN bit

Question asked by Eishi Shibusawa on Jun 21, 2018
Latest reply on Jun 25, 2018 by igorpadykov

Dear Sir

 

I refer to the IMX6ULLRM Rev.1 and IMX6ULLIEC Rev. 1.2.

 

Following registers have the POWERDOWN bit.

CCM_ANALOG_PLL_ARM

CCM_ANALOG_PLL_SYS

CCM_ANALOG_PLL_AUDIO

CCM_ANALOG_PLL_VIDEO

CCM_ANALOG_PLL_ENET

 

I refer to the following community.

https://community.nxp.com/message/936213

It seems that the POWERDOWN bit controls the power to the PLL in low power mode.

 

On the other hand,

It is described at P30 Table 15 in IMX6ULLIEC as the follows.

 

SYSTEM IDLE : 528 PLL is active, other PLLs are power down

LOW POWER IDLE : All PLLs are power down

SUSPEND : All PLLs are power down

 

It seems that the POWERDOWN bit does not control the Power for PLL in Low Power mode.

 

Q1.

What does the POWERDOWN bit control?

 

 

The CCM_ANALOG_PLL_*** registers have four kinds of similar registers.

 

The CCM_ANALOG_PLL_***

The CCM_ANALOG_PLL_***_SET

The CCM_ANALOG_PLL_***_CLR

The CCM_ANALOG_PLL_***_TOG

 

Q2.

What is the difference for these registers?

How should we treat these registers?

 

Best Regards,

Eishi SHIBUSAWA

 

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