STM32H7 Quad-SPI for Ethernet Communication

[DWill.4]

I'm confused regarding the importance of Quad-SPI for Ethernet communication. I see that pins PH2/PH3 were configured for QSPI without it being activated for either core. I tested leaving these pins in GPIO_Analog mode and still detected UDP broadcasts from the example code. Are these Quad-SPI pin configurations optional?

How to create project for STM32H7 with Ethernet and LwIP stack working

[waclawek.jan · Accepted solution]

@Adam BERLINGER​  will tell it for sure, but I'm reading it as "as in 'H750 there's deliberately quite little FLASH so most probably you'll need external FLASH, probably QSPI-connected".

In other words, no, it's not directly ETH-related.

JW

[Tesla DeLorean]

Just flagging potential conflicts, and more optimal pin choices that don't foreclose other usage.

[Pavel A.]

Note that these pins are for MII interface. In RMII mode there's no conflict at all.

--pa

[Adam BERLINGER]

Hello,

yes,

This is due to pin collision in pinout. Moving MII signals from PH2/PH3 allows to use QuadSPI later on if necessary. But it is not required for Ethernet operation.

This is also related to this specific H7 board.

Adam