My question here is this: Can the STM32G4x1 line access external flash memory (e.g., via QuadSPI)?
My confusion is as follows: the following page:
https://www.st.com/en/microcontrollers-microprocessors/stm32g4-series.html
introduces the STM32G4x1, G4x3, and G4x4 lines. In the table (at the center of the page), Quad-SPI (for accessing external flash memory) is listed in the left column as a common feature across all three of these lines.
In addition, the slides at
https://www.stmicroelectronics.com.cn/content/ccc/resource/training/technical/product_training/group0/42/95/f2/b1/78/5c/49/55/STM32G4-Memory-QuadSPI_interface_QUADSPI/files/STM32G4-Memory-QuadSPI_interface_QUADSPI.pdf/_jcr_content/translations/en.STM32G4-Memory-QuadSPI_interface_QUADSPI.pdf
indicate that "The Quad-SPI memory interface integrated inside STM32G4 microcontrollers provides a communication interface, allowing the microcontroller to communicate with external SPI and Quad-SPI memories".
In addition, Ch 19 of the exhaustive RM0440 STM32G4 Reference Manual, which describes QuadSPI, doesn't make specific mention that QuadSPI is disabled on the G4x1 line.
HOWEVER,, in (e.g.) the STM32G474VE features diagram, I see a block labelled External Interface, that mentions both FSMC and QuadSPI, where I don't seem mention of either in the features diagrams for ICs in the G4x1 family. I'm also having a very hard time finding the right pins for QuadSPI (BK1_IO*, BK2_IO*) on the G4x1 IC we are looking at using STM32CubeMX.
So... confusion.
