topic Re: Flash write access with AHB in MCX Microcontrollers

Flash write access with AHB

vanessa_dis — Tue, 18 Nov 2025 23:39:39 GMT

Hi, I would like to know if flash write access is supported by mimxrt1050 controller and NOR flash QSPI. I read that only in hyperflash was available this but i would like to confirm this.

Thank you.

Re: Flash write access with AHB

Sam_Gao — Wed, 19 Nov 2025 08:26:38 GMT

@vanessa_dis

The MIMXRT1050's FlexSPI controller fully supports read, write, and erase operations for QSPI NOR flash; using it on the EVK board simply requires hardware modifications to switch from the default HyperFlash chip.

https://www.nxp.com/docs/en/application-note/AN12108.pdf How to Enable Boot from QSPI Flash

Re: Flash write access with AHB

vanessa_dis — Wed, 19 Nov 2025 17:41:02 GMT

Hi Sam, Currently I have it with IP operations working, but can NOR Flash QSPI supports flash write using AHB?

Re: Flash write access with AHB

Sam_Gao — Mon, 24 Nov 2025 08:06:33 GMT

Did you ask details for HAB (High Assurance Boot)?

https://spsdk.readthedocs.io/en/stable/images/hab.html

Please refer to below AN with secure acess (Sorry, I can't send it directly, please apply for access or contact with local Sales/FAEs).

AN12681 How to use HAB secure boot in i.MX RT10xx [AN979510]

Re: Flash write access with AHB

vanessa_dis — Mon, 24 Nov 2025 23:41:56 GMT

Hi,

I am refearing AHB Advanced High-performance Bus

Re: Flash write access with AHB

Sam_Gao — Tue, 25 Nov 2025 07:35:02 GMT

@vanessa_dis

I got your point.

Yes, the FlexSPI controller on the i.MX RT1050 and RT1060 series fully supports write access to external QSPI NOR flash using the AHB bus. The capability is not exclusive to HyperFlash.

The FlexSPI controller is designed with a flexible architecture to support various external memory types, including Serial NOR Flash (which covers QSPI), HyperFlash, and HyperRAM . The controller provides memory-mapped read and write access through the AHB bus for any of these supported devices .

https://www.nxp.com/docs/en/nxp/application-notes/AN12239.pdf