Internal watchdog question on i.MX6

[charleshuang]

Hi Freescale,

Let GPIO_9 pin sets WDOG1_B. When internal watchdog on i.MX6 Dual-Core CPU is timeout, this pin will be action.

If some problems occur on CPU and internal watchdog is timeout, this pin will have action it?

Thank you.

Best Regards,

Alex

[Yuri]

  Correct, GPIO_9 pin may be asserted, when the watchdog (WDOG1) event
takes place. It should be configured as WDOG1_B :

IOMUXC_SW_MUX_CTL_PAD_GPIO09[MUX] = 1

Have a great day,
Yuri

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[charleshuang]

Hi Yuri,

1. I read i.MX 6Dual/6Quad Applications Processor Reference Manual file. According to this document, if I want GPIO_9 pin to configured as WDOG1_B.

It is set as follows:

Pad Mux Register (IOMUXC_SW_MUX_CTL_PAD_GPIO09):

001 ALT1 — Select signal WDOG1_B. (IOMUXC_SW_MUX_CTL_PAD_GPIO09[MUX] = 1)

But I do not see the following message should be set:

IOMUXC_KEY_COL6_SELECT_INPUT[DAISY] = 0 (for mode ALT2)

Do I need to set the above message?

2. No matter what the circumstances, when the internal watchdog is timeout, this pin must be operating.

   Correct?

Thank you.

Best Regards,

Alex Cheng

[Yuri]

Correct, the daisy chain is not used for outputs.

Rrgards,

Yuri.