How to use SJA1110 internal 100BASE-T1 PHY devices?

[GuilhermeS32G3]

Dear NXP fellows,

Recently I am doing this investigation concerning a connectivity issue of SJA1110 in our custom board based on NXP S32G399ARDB3 board.

We have the SJA1110 Port 4 connected via SGMII to the PFE_MAC0 interface (Serdes1, lane0).

According to the SJA1110 datasheet, it has 6 internal 100BASE-T1 PHY devices connected to Ports 5~10:

According to this reply in my previous question, "SMI_AP_MDC and SMI_AP_MDIO, The SMI access point (SMI-AP) interface allows S32G to access SJA1110 internal 100BASE-T1 PHYs."

And these PHYs are connected to the MDIO 2, the same used by PFE_MAC2 on this board.

Indeed, when I installed mdio-tools and checked this MDIO bus I could see those PHY devices:

root@s32g399ardb3:~# mdio pfeng-emac-2
 DEV      PHY-ID  LINK
0x03  0x00000000  down
0x09  0x001bb012  down
0x0a  0x001bb012  down
0x0b  0x001bb012  down
0x0c  0x001bb012  down
0x0d  0x001bb012  down
0x0e  0x001bb012  down

Where 0x03 represents the external PHY connected to PFE_MAC2 and the other are the internal PHYs of SJA1110.

However, I don't understand how to use these internal PHY devices.

If I connect the network cable between the internal PHY in port 5 (0x09) and my laptop Ethernet port, should it automatically detect a link?

Does this PHY belong to PFE_MAC0 (SGMII to SJA1110 P4) or to PFE_MAC2 (MDIO bus 2)?

If I assign one IP address to PFE_MAC0, for example:

ifconfig pfe0 192.168.10.5 up

Am I assigning this IP address to that specific PHY or to the switch itself?

How can I know which IP address corresponds to each of the internal PHYs of the switch if they are all connected at the same time?

Can someone please guide me to enable a successful interface capable of pinging between the internal PHY and my laptop?

Thank you very much for the support,

Best Regards,

Guilherme

[PavelL]

Hi Guilherme,

I believe that you are using some converter like RDDRONE-T1ADAPT: Ethernet media converter | NXP Semiconductors to connect 100BASE-T1 to your computer. Once you do a physical connection, you should see the Link up (PHY_STATUS (0x8102) register shall have value like 0x007E).

PHYs belong to switch. IP addresses belong to TCP/IP protocol. Internal PHYs have only MAC address.

To have successful ping reply, link partner (SJA1110 or S32G3) needs run TCP/IP stack with set IP address.

Since I am connected to corporate network, I have to use some USB to ETHERNET adapter, which appears as Ethernet4 in my case. Address and mask to be setup for this new adapter.

Best regards,

Pavel

[GuilhermeS32G3]

Hi @PavelL ,

Thank you very much for your reply, it was quite enlightening.

You are right, we use a converter for connecting the 100BASE-T1 to the computer.

So, just to clarify, the IP address of the SJA1110 switch is configured in the S32DS SDK for SJA1110 (tcpip_stack -> NetIface), right? Does that mean the IP address assigned to the interface PFE0 in S32G3 is irrelevant regarding the switch?

When you say

PHY_STATUS (0x8102) register shall have value like 0x007E

Are you fetching this information through the S32DS debugger interface connected to the SJA1110 switch or through a specific command in the terminal?

Best regards,

Guilherme