Configuration of STM32H725 OCTOSPI with Delay Block for APS6408 PSRAM

[MHoll.2]

I'm configuring the timings for an APS6408L-3OBMx PSRAM on my custom hardware, based on the STM32H725IGK6, in memory mapped mode, to be used principally as Frambuffer for the LTDC controller.
I have to enable the Delay Block parameter in STM32CubeMX to get a partial working PSRAM (I still have some errors on the Display), but there seems to be non possibility to configure the Delay Block inside STM32CubeMX and/or STM32CubeIDE. (The function for the Delay Block are in stm32H7xx_ll_delayblock.c/.h but this files are not included when enabling the Delay Block inside the OCTOSPIx configuration).
So my questions:
- Is there a known good configuration for the APS6408 PSRAM?
- How can I configure the Delay Block for the OCTOSPIx interface?

Martin

[KDJEM.1]

Hello @MHoll.2;

 

STM32CubeMX does not generate code for the Delay Block calibration.

Two methods of calibration process utilizing the DLYB are offered: Fast Tuning and Exhaustive tuning; each method has its own advantages compared to other:
• Fast tuning: the advantage is that it takes less time to be configured
• Exhaustive tuning: the advantage is that there are less chances to face a data transfer error

For PSRAM delay block calibration, I recommend you to look at DLYB_OSPI_PSRAM_ExhaustiveTuning example.

This example has been tested with STMicroelectronics B-U585I-IOT02A  and APS6408L memory.

Also, I think AN5050 precisely 6.2 Delay-block calibration process section can help you on how calibrate the delay block.

I hope this help you.

Thank you.

Kaouthar