eMMC CLK Voltage

[coilnpark]

Hi all,

I am developping custom board by using SABRESD board.

I have a simpmle question.

As I know, emmc CLK voltage is proper 3.3V or 1.8V according to the VCC or VCCQ voltage.

However, my board CLK voltage is 5V as below the picture.

When I checked SD card CLK, it was also 5V.

I am using usdhc2, 4 (eMMC is using usdhc4)

Anybody can help me?

[coilnpark]

Hi, igor

I refered the scehmetic of SABRESD NXP_SPF-27392_C3. It used just GEN3V3.

Do I have to use  "NVCC_NANDF" Power?

[SPF-27392_C3]

[My board]

[igorpadykov]

Hi Coiln

from i.MX6Q side voltage should be as described in Table 96. 21 x 21 mm Functional Contact Assignments, column "Power Group"

i.MX 6Dual/6Quad Applications Processors for Consumer Products - Data Sheet

If it is 5V, probably it is shorted to some other signal.

Best regards
igor

[coilnpark]

Hi igor

Thank you for your prompt reply.

I also tested sdcard clk of SABRESD kit.

The sdcard clk voltage was 4.3V

Even I will check our board for high voltage, SABRESD kit voltage is also weird.

Could you check it?

Best regards,

Colin Park