GPIO Output to Output Skew

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GPIO Output to Output Skew

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ccrsa
Contributor I

Hi

I was wondering if it is possible to use the RT1064 GPIO to synchronously trigger external counters  instead of using pin fanout or a 1-to-4 clock buffer. 

What would be the output-to-output skew between GPIO output pins controlled by the same DR? 

Thank you.

C

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jingpan
NXP TechSupport
NXP TechSupport

Hi @ccrsa ,

If the two GPIOs are in same group, there will be no difference because you can toggle them in a same register at same time. There isn't hardware path difference for them.

 

Regards,

Jing

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jingpan
NXP TechSupport
NXP TechSupport

Hi @ccrsa ,

I'm not very clearly understand your requirement. But I think you can use the RT1060 XBAR function.

 

Regards

Jing

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ccrsa
Contributor I

Thank you for responding @jingpan.

Sorry if I was not clear. What I meant was if you toggled 2 x GPIO outputs from low to high and compared the signal transitions with an oscilloscope, would there be a significant time delay or skew between them and would it be deterministic? 

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jingpan
NXP TechSupport
NXP TechSupport

Hi @ccrsa ,

If the two GPIOs are in same group, there will be no difference because you can toggle them in a same register at same time. There isn't hardware path difference for them.

 

Regards,

Jing

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