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i.MX6 Power  LDO bypass

Question asked by 王剑翰 on Oct 13, 2014
Latest reply on Sep 11, 2018 by AL ee

I check the table 8 in IMX6SDLCEC.pdf and find there are the different supply operating ranges in different run modes(LDO Enable and LDO Bypassed). I can not find any description about the two modes in other documents but IMX6SDLRM.pdf, but there are 4 different modes : Internal Bypass,External Bypass,Power Gate,Analog regulation mode.

1, How to understand the difference?

2, Which one is the default mode for the core? LDO Enable or LDO Bypassed mode?

3, If the default mode is LDO Bypassed mode, and we need set the LDO Enable mode, how to design the VDD_ARM_IN and VDD_SOC_IN circuit?

I have checked the reference design in [SPF-27516_C3.pdf]. And, I find VDD_ARM_IN = VDD_SOC_IN = 1.375V, which is not fit the LDO Bypassed mode operating range.

4, How to change the run modes?

I find the information as below:

TRAG==0x1F  internal bypass mode

TRAG==0x00  POWER GATE mode

but I don't know what is the TRAG. How to find it?