Bus keeper feature of i.MX8X family

[Kazuma_Sasaki]

From Datasheet IMX8DXAEC Rev2:

"Keeper Circuit Resistance" is defined only single-voltage GPIO port.

But, It seems that we can select bus-keeper setting on following balls via PULL field in pad configuration register.

USB_SS3_TC0
USB_SS3_TC1
USB_SS3_TC2
USB_SS3_TC3
ADC_IN0
ADC_IN1
ADC_IN2
ADC_IN3
ADC_IN4
ADC_IN5
SCU_WDOG_OUT
PMIC_I2C_SCL
PMIC_I2C_SDA
PMIC_INT_B
SCU_BOOT_MODE0
SCU_BOOT_MODE1
SCU_BOOT_MODE2
SCU_BOOT_MODE3
MIPI_CSI0_MCLK_OUT
MIPI_CSI0_I2C0_SCL
MIPI_CSI0_I2C0_SDA
MIPI_CSI0_GPIO0_01
MIPI_CSI0_GPIO0_00
SCU_PMIC_STANDBY
SCU_GPIO0_00
SCU_GPIO0_01

<Questions>

Q1. Which balls support bus-keeper function? Is it only support above balls?

Q2. The bus-keeper feature is only applied for GPIO input mode. Is it right?

Q3. The bus-keeper feature does not mentioned in the current RM. Will it be revised in the nearly future?

Best Regards,

Kazuma Sasaki.

[Yuri · Accepted solution]

Hello,

  Use the following resource for more details about i.MX8 pin configuration.

System Controller Firmware 101 - Pad configuration service 

  As for the questions:

1) yes, only the pins having the PULL bit field with bus-keeper option support bus-keeper function;

2) only inputs have bus-keeper option;
3) there is no information about documentation details.

Regards,

Yuri.

[Kazuma_Sasaki]

Dear Yuri,

I appreciate your support. Your explanation really helped.

Best Regards,

Kazuma Sasaki.