Do all packages of the family STM32N6x7 support Gigabit Ethernet?

[optikan]

I’m working on a system design that incorporates gigabit Ethernet. I’ve been looking at using the STM32N6x7 family of parts to support this functionality. The product selector and datasheet seem to indicate that each package supports the 1000 Ethernet. In addition, the datasheet starts off by listing the gigabit Ethernet as a family supported technology. However, Tables 2 - 5 of the datasheet that list the variations in supported functionality between packages does not list Ethernet whatsoever on any package. To me this implies that the functionality is supported on all devices equally, otherwise the different protocols supported would be listed here.

Figure 1: Example of Product Selector Filter

Figure 2: Excerpt from Datasheet Listing 1 Gbit Ethernet Support for the STM32 Family 

Thus, I started with the smallest package for ease of routing and space consumption. However, when matching the device with an external gigabit Ethernet PHY as required, I noticed that there are signals that are not present on the lower pin count models that are necessary for gigabit Ethernet. 

Figure 3: Absence of RGMII TXD3, TXD2, and RXD3 Support for STM32N6x7 Packages with Fewer than 198 Pins

Additionally confusing is that STM32CubeMX allows the activation of the RGMII interface (although lacking at least these three signals) on the STM32N657Z model but does not allow this activation on the STM32N657I nor A models. I now believe this is because they similarly do not have the required pins to support gigabit Ethernet interfaces. 

Prior to continuing my design, the question becomes:

Do all the packages in the STM32N6x7 family support gigabit Ethernet? If yes, how is it possible on the smaller packages? If not, can the documentation be made clearer? Because to me this is quite contradictory and unclear where it could very easily be with the tables and such that already exist in the datasheet.

[mƎALLEm]

Hello ​@optikan and welcome to the ST community,

Thank you for your question.

The RGMII is only available on the packages: VFBGA264, VFBGA223, VFBGA198, VFBGA178, VFBGA169GP, VFBGA169, VFBGA142 of series: STM32N6x5xx and STM32N6x7xx.

Need to escalate two things: Ethernet is not listed in the datasheet Table 2. STM32N645xx features and peripheral counts. (internal ticket for follow-up CDM0065765)

Why RGMII config is available for package that don’t support 1Gb:  (internal ticket for follow-up CDM0065768)

Hope I’ve answered your question.

[optikan]

Thank you, that does clearly answer the question.

 

Do I need to escalate the two things you mentioned? If so, how do I go about that?

[mƎALLEm]

Don’t worry about that. I’ve already did it. I’ve edited my previous post for internal tickets.

Thank you.