Problem occurs when octoSPI runs at 120Mhz (APS6408L-30B -BA RAM)

[Mtopa.1]

Hello everybody. I have a question. I am using the STM32L4p5g development board. First, I ran the APS6408L-30B RAM, which is connected to the oscoSPI peripheral, at 40Mhz, but I can't run this ram at 120Mhz, what could be the reason (I'm using the code from ST's repository)

[Alex - APMemory]

Hi,

There are probably some hardware limitations on this development board, the SI/PI limit of OSPI on this board is almost at this frequency. Doing calibration may improve some frequency.

Alex

[Alex - APMemory]

One more comment to be more precise, with this HW, It is around 40MHz without calibration, and it does not exceed 60MHz after calibration. 120MHz achievable when you design your HW, PCB design guideline can be supported upon need.

Hope this help

Alex