RT1020 reference manual error: GPT1_COMPARE1-3 signals?

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RT1020 reference manual error: GPT1_COMPARE1-3 signals?

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Contributor IV

RM: i.MX RT1020 Processor Reference Manual, Rev. 1, 12/2018

Hi,

Regarding the GPT1_COMPARE1-3 signals:

On page 273 in the RM tells us that:

GPT1_COMPARE1           GPIO_AD_B0_00              ALT7

GPT1_COMPARE2           GPIO_EMC_41                  ALT7

GPT1_COMPARE3           GPIO_EMC_40                  ALT7

Also from page 276/277:

LPUART7_RXD                  GPIO_EMC_35                  ALT2

LPUART5_CTS_B              GPIO_EMC_36                  ALT2

LPUART5_RTS_B              GPIO_EMC_37                  ALT2

These seem to match the relevant SW_MUX_CTL_PAD_GPIO_xxx mux mode register settings.

So far so good.

But table ‘46-2. GPT External Signals’, on page 2442, tells us:

GPT1_COMPARE1           GPIO_EMC_35  ALT2      O

GPT1_COMPARE2           GPIO_EMC_36  ALT2      O

GPT1_COMPARE3           GPIO_EMC_37  ALT2      O

Does this make sense to you? You can't have two modules using the same signal/muxmode combination can you?

I just had a look at the 1050 RM. The GPT1_COMPARE settings are all consistent. So it looks like GPT table in the 1020 RM  (page 2442) is just wrong – a cut and paste error?

Many thanks.

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NXP TechSupport
NXP TechSupport

Hello,

Yes, GPT table in the 1020 RM  (page 2442) is error.Thanks for your information and We will forward it to the related team. 

Have a nice day.

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Contributor IV

In fact the whole table 46-2 is wrong compared to page 273. It should read more like this:

GPT1_CAPTURE1 GPIO_AD_B0_02 ALT7 I

GPT1_CAPTURE2 GPIO_AD_B0_01 ALT7 I

GPT1_CLK GPIO_EMC_39 ALT7 I

GPT1_COMPARE1 GPIO_AD_B0_00 ALT7 O

GPT1_COMPARE2 GPIO_EMC_41 ALT7 O

GPT1_COMPARE3 GPIO_EMC_40 ALT7 O

GPT2_CAPTURE1 GPIO_AD_B1_10 ALT6 I

GPT2_CAPTURE2 GPIO_EMC_28 ALT6 I

GPT2_CLK GPIO_EMC_31 ALT6 I

GPT2_COMPARE1 GPIO_AD_B1_11 ALT6 O

GPT2_COMPARE2 GPIO_EMC_29 ALT6 O

GPT2_COMPARE3 GPIO_EMC_30 ALT6 O

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