About I/O direction of LVDS signals in i.MX6DQ.

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About I/O direction of LVDS signals in i.MX6DQ.

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keitanagashima
Senior Contributor I

Dear All,

Hello.

I have a question about I/O direction of LVDS signals in i.MX6DQ.

Refer to Table 100. 21 x 21 mm Functional Contact Assignments in IMX6DQAEC(Rev.4).

The direction of LVDS signals was all input.

And, I couldn't find the register of direction setting in Reference Manual.

I consider that LVDS signals only use as output.

[Question]

Where does it change the direction from input to output in U-boot?

Best Regards,

Keita

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igorpadykov
NXP Employee
NXP Employee

Hi Keita

you are right, in i.MX6 LDB LVDS signals only used as output,

setting register LDB_CTRL, field ch0,1_mode[1:0] to "channel enabled"

will enable to output data signal.

Best regards

igor

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igorpadykov
NXP Employee
NXP Employee

Hi Keita

you are right, in i.MX6 LDB LVDS signals only used as output,

setting register LDB_CTRL, field ch0,1_mode[1:0] to "channel enabled"

will enable to output data signal.

Best regards

igor

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keitanagashima
Senior Contributor I

Dear Igor,

Sorry. I have an additional question.

During reset period, is the direction of LVDS signals the output?

Best Regards,

Keita

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igorpadykov
NXP Employee
NXP Employee

Hi Keita

yes, during reset period the direction of LVDS signals is also output.

Best regards

igor

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art
NXP Employee
NXP Employee

This is just a typo in the table, all of the LVDS signals are analog differential pairs type.


Have a great day,
Artur

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keitanagashima
Senior Contributor I

Hi Artur,

Thank you for your reply.

Let me clarify my understanding.

- All LVDS signals are always output.

- "Keeper" is typo. And, no pull-up,down.

Is it OK?

Best Regards,

Keita

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art
NXP Employee
NXP Employee

Yes, you are right.

Best Regards,

Artur

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keitanagashima
Senior Contributor I

Hi Artur,

Thank you very much!

I hope the Data sheet and Reference manual fix the typo in the next update.

DS: Table 100. 21 x 21 mm Functional Contact Assignments in IMX6DQAEC(Rev.4).

RM: Table 39-3. LDB External Signals in IMX6DQRM(Rev.3).

Best Regards,

Keita