i.MX RT Crossover MCUsのトピックFLASH NOR boot frequency issue

FLASH NOR boot frequency issue

yosri_c — Thu, 01 Aug 2024 10:56:50 GMT

Hello NXP support,

i have an issue regarding the Flash NOR clock frequency , i have an RT1176 custom board , and i have a IS25LP128 flash NOR on FlexSpi2 portA with mux attached , i have configured the FCB as attached below and i wanted to change the frequency from 60Mhz to 133Mhz , now after doing that i try to compare two exact similar boards one with 60Mhz and the second with 133Mhz and i still get the same perf with no difference whatsoever ! i need to understand first if i configure the serialClkFreq in FCB to be 133Mhz and the board boots up correctly but could it default to 60Mhz or is there some place else i have to set the frequency ?

i'd really appreciate any help on the matter

Re: FLASH NOR boot frequency issue

Harry_Zhang — Tue, 06 Aug 2024 06:27:26 GMT

Hi @yosri_c

If you try to change it to 166MHz, are their performances the same?

Hang

Re: FLASH NOR boot frequency issue

yosri_c — Tue, 06 Aug 2024 11:05:44 GMT

Hi there Hang,

i'll try that and be back with an answer. althought i think the max freq for NOR flash is 133Mhz isn' it ?

Regards
yosri

Re: FLASH NOR boot frequency issue

Harry_Zhang — Thu, 08 Aug 2024 03:56:29 GMT

Hi @yosri_c

The maximum frequency of different types of flash varies. For example, the flash model uses MX25UM51345G, and according to the information in the flash manual, the normal operating frequency can reach 200MHz.

Hang