Can we interface SRAM/pSRAM with the STM32L496controller on QUAD SPI?

[RKadl]

Hi,

We have use STM32L496 controller, can I interface external SRAM or pSRAM on QSPI pins?

If not, what is the other option for accessing the external SRAM.

[Andreas Bolsch]

There are only few SRAMs with serial interface available, and those offer only rather limited capacity. Furthermore, QSPI does support only memory-mapped read. You could use indirect write, of course. For read/write in large chunks (purely sequential!) speed penalty wouldn't be too bad, but for random access ... Use FSMC for external parallel (P)SRAM if enough pins available.

[RKadl]

Thank you Andreas.

if there is a way to interface both flash and SRAM on the same QSPI port?

[Andreas Bolsch]

In a way, yes:

https://community.st.com/s/question/0D53W00000FyuCKSAZ/stm32-qspi-flash-read-only-problem-in-memory-mapped-mode?t=1597906790782

If there's only one pin available for NCS via AF selection, you could still use an external demultiplexer.