LS1043A can not boot from SD card

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LS1043A can not boot from SD card

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Hahawell
Contributor III

Our 1st PCB version is OK. The 2nd PCB version can not boot from SD card.

The SD card VCC is constant 3.3V. 

the problem is: Why the clock voltage level is 1.5V? (see the picture blow)

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ufedor
NXP Employee
NXP Employee

It is required to compare schematics of the operational and failing boards.

As a first step check EVDD voltage.

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Hahawell
Contributor III

EVDD voltage is OK.

It looks like the SD card does not be initialized:The voltage can not reach 3.3V, and the frequency can not reach 25MHz(probably 200KHz )

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ufedor
NXP Employee
NXP Employee

> The voltage can not reach 3.3V

It is required to determine why the voltage is low.

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