STM32 N6 Octo SPI and FLASH on same PN Port/Pins

[Paul_V]

I want to use the SMT32N6 VFBGA142 or VFBGA169 package.  These parts do NOT have XPSIM_P1(on port PO).  They only have XPSIM_P2(on port PN).

Can I connect both Octo FLASH and Octo PSRAM on port PN and use the two chip selects (NCS1 & NCS2) to independently talk to the chips?  I need to boot off the FLASH and then use the PSRAM to execute the program.

Any signal integrity issues or gotchas I need to keep in mind?

 

[Shirley.Ye]

Both Flash and PSRAM must properly tri-state their outputs when not selected. Most modern Octo-SPI devices do this, but check the datasheets for both devices to confirm that when CS is not active, the outputs will be in high-Z state.