flash DQS pin default status in RT1051

[ffloree]

Hi,

After system bootup, I checked register IOMUXC_SW_MUX_CTL_PAD_GPIO_SD_B1_05, it's FLEXSPIA_DQS, but my code doesn't touch it, it should be GPIO3_IO05 as spec says. So my question is (1) whether ROM code changes this property to FLEXSPIA_DQS? And if I want to change this pin's property to others, and ROM code can use the new property, (2) how can I do? By checking fuse and FlexSPI Configuration Block, no this feature included. Thank you!

[ffloree]

Thanks Kerry, you did give me a great help!!

[kerryzhou]

You are welcome!

If you have the new question in the future, welcome to create the new question post!

Best Regards,

Kerry

[kerryzhou · Accepted solution]

Hi tom fang ,

   About the DQS pin, it is the special pin, we highly recommend you left it as float, otherwise, it will influence your external flexspi flash, it will limit the flexspi flash speed.

About GPIO_SD_B1_05 default value, from the IOMUX register, it seems the default function is the GPIO.

But, when ROM do booting, it will modify this pin as the DQS function.

The ROM code do it automatically.

Anyway, don't use this pin as the other function, just leave it as the DQS function, and keep it floating.

Wish it helps you!

If you still havfe questions about it, please kindly let me know.

Have a great day,
Kerry

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