how to set OCTOSPI1 of STM32L4P5G-DK as 1.8V instead of 3.3V?

[JKim.2]

Hello,

Testing 3.3V Octo-SPI PSRAM is fine on the STM32L4P5G-DK board. I'd like to test another 1.8V Octo-SPI PSRAM now. The solder bridge options SB17/SB18 for PSRAM and SB13/SB14 for MCU are modified for the purpose. However, a certain DQ bit is still failing. What else do I have to configure accordingly?

Thanks.

[Mike_ST]

Hello,

>> The solder bridge options SB17/SB18 for PSRAM and SB13/SB14 for MCU are modified for the purpose. What else do I have to configure accordingly?

That should be it, unless you're connecting a chip that requires different connections than the ones available on the STM32L4P5G-DK.

>> However, a certain DQ bit is still failing.

You means only one data line is failing ? Could it be a bad solder ?

[JKim.2]

Hello @Mike_ST ,

The 1.8V Octo-SPI PSRAM has the exact same 24-ball configuration as the original 3.3V Octo-SPI PSRAM. 

only the bit17 in 32bits is failing. other 31bits are fine. The OCTOSPI1 speed was set as 60MHz. (SYSCLK 120MHz, prescaler 2) as AN5050 introduced. Do I still need to configure something in the .ioc file?

Thanks.

[Mike_ST]

Hello,

Hard to tell, maybe timing related.

Please have a look at the following application note:

AN5050