Speed field option on the IMX RT IO pad configuration

[rj_djager]

Hello all,

I have a question regarding the Speed configuration option in the IOMUXC SW_PAD_CTL registers. 

Here you can configure the drive strength, slew rate, pullup, open drain, speed, etc. All the fields are clear except for one setting. The speed field. What does this setting actually change in the hardware? 

Does it apply a filter to the pad?

Thank you for for your time. 

[fangfang · Accepted solution]

Hello,

SPEED is a selectable bit field that sets electrical characteristics of a pin in a given frequency range. This
field provides additional 2-bit slew rate control. These options can either increase the output driver current
in the higher frequency range, or reduce the switching noise in the lower frequency range.
The operational frequency on GPIO pads is dependent on slew rate (SRE), speed (SPEED), and supply
voltage (OVDD). See Operating Frequency table in the GPIO block guide for more details.

Hope it help you. Have a nice day.

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