Regarding GPIO's Speed of MIMXRT1176CVM8A (MIMXRT1176 Family's")

[Yogesh96]

Hi Team,

We are using controller MIMXRT1176CVM8A in our project.

Below are the screenshots from the reference manual "i.MX RT1170 Processor Reference Manual, Rev. 2, 06/2023".

I have the following two queries:

1. Based on the above two tables, can we conclude that the GPIO max speed can be 240MHz if we use BUS_CLK_ROOT and 160MHz if we use BUS_LPSR_CLK_ROOT?
2. We need to interface SDRAM and run the same at 100MHz. Can it be achieved using GPIO?

[Gavin_Jia]

Hi @Yogesh96 ,

Thanks for your interest in NXP MIMXRT series!

1. Yes, you are right.

This needs to be corrected after discussions with internal colleagues. Fast GPIOs should be able to flip around 200MHz, but regular GPIOs can't do that. You can refer to this post:
Struggling to get fast GPIO working on i.mxrt1176 - NXP Community

https://community.nxp.com/t5/i-MX-RT-Knowledge-Base/RT1060-Normal-GPIO-vs-Fast-GPIO/ta-p/1119856

2. We recommend using SEMC to connect to SDRAM because, in general, GPIOs are not recommended for direct use in high-speed memory interfaces, considering precision and speed.

Best regards,
Gavin