About AUD_TXFS PAD state in i.MX6SL.

[keitanagashima]

Dear Sir or Madam,

External Pull down resistor was connected "AUD_TXFS" pad (H21) in i.MX6SL.

The default pad's state is Input Keeper, but the pad's state was seen as "High" before uboot processing.

Is it possible to keep the pad's state "Low" from power-on to Kernel operation?

Best Regards,

Keita

[keitanagashima]

Hello. Yuri,

> is it possible to look at the schematic (via request) ?

Yes, possible.

But, I'd like to send it by secure transfer.

Could you tell me your e-mail address?

Best Regards,

Keita

[Yuri]

my E-mail :

Yuri.Muhin@nxp.com

~Yuri.

[Yuri]

Hello,

  You may try 1K Ohm pull down resistor, but - first - please check

if the high level on the aud_txfs pin is not produced by an external circuit.

Have a great day,
Yuri

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[keitanagashima]

Hi Yuri,

Hello. Thank you for your reply.

We put the 1K Ohm pull down register, but the result wasn't solved. (The voltage level decrease a little.)

Do you have other idea?

(Or, does it set "AUD_TXFS" to High in iROM?)

Best Regards,

Keita

[Yuri · Accepted solution]

Hi,

  Perhaps the problem is concerned with general power up issue,

when during short period of stabilization states of pins are not defined,

and - moreover - some GPIOs may be actively driven. 

Regards,

Yuri.

[keitanagashima]

Hi Yuri,

Thank you for your reply.

Is it possible to avoid this phenomenon? (impossible?)

Best Regards,

Keita

[Yuri]

Hi,

> Is it possible to avoid this phenomenon? (impossible?)

I am afraid - no. Nevertheless, please check i.MX6 power up sequence.

Regards,

Yuri.

[Yuri]

Hello, Keita !

is it possible to look at the schematic (via request) ?

Regards,

Yuri.