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Probleme with emmc with vccq =1,8v cant detect with supp or isp.

Hi, problem with emmc have vccq - 1.8v, can not detect, it gave me the initial emmc and failed - error: 00FF8081, when I use an external 1.8v, it tries to read the information, read cid csd successfully but error to read ecsd and failed - no data response state: I tried to measure vccq either in isp or on the emmc support , it is either absent or it is of low value -max 1.4v-.
2020-07-28_17-22-26.png
2020-7-29 23:18


2020-07-28_17-26-16.png
2020-7-29 23:18



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2020-7-29 23:20

Maybe it's your adapter problem.   1.8V is powered by U4  LDO   XC6206-1.8V on EMMC adapter.

check IC :XC6206-1.8V

when choice VCC3.3/VCCQ1.8V . programmer's VCCQ PINS(2# 3# of P2) is Is high resistance state.and 1.8V power by XC6206.


if choice VCC3.3/VCCQ3.3V   VCC and VCCQ powered by programmer.

this is EMMC adapter SCH.
EMMC_Sch.jpg
2020-7-30 13:21

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