AnsweredAssumed Answered

PMIC_STBY_REQ remain in zero on custom board

Question asked by Almaz Khamidullin on Feb 9, 2019
Latest reply on May 15, 2019 by Almaz Khamidullin


We are trying to get working our diy IMX6ULL based pcb.

Reference design of NXP taken as based for board.

We are unable to make it working - nothing on UART.

It should start from onboard SPI flash which contain embedded linux image that works fine on development board.

SPI flash soldered preloaded with image.

Using oscilloscope I see that:

- VDD_HIGH_IN = 3.3V

- NVCC_CSI = 3.3V

- VDDA_ADC_3P3 = 3.3V

- NVCC_SD = 3.3V


- VDD_DRAM = 1.38V

- PMIC_ON_REQ = 3.0V

- ONOFF = 3.0V

- I see oscillation on XTALO:


But PMIC_STBY_REQ remains in 0V.


What are the possible issues can be here?


TEST_MODE connected to GND



LCD_DATA_4, LCD_DATA_5 and LCD_DATA_11 pulled up to 3.3V, all other LCD pins pulled down to achieve booting from QSPI which connected to onboard SPI flash IC using ECSPI1_CLK (CSI_DATA04), ECSPI1_SS0 (CSI_DATA05), ECSPI1_MOSI (CSI_DATA06), ECSPI1_MISO (CSI_DATA07).