AM3358: 4 Ethernet ports

Anatoly Ananko

Part Number: AM3358
Other Parts Discussed in Thread: SYSCONFIG

Hi!

I'm designing a PCB with AM3358 processor (ZCZ package) and I want to connect 4 Ethernet PHYs to it.

But any combination of interfaces I tried in SysConfig causes "Resource conflict" on some pins.

Does this mean that only 3 PHYs maximum can be connected, despite of 4 interfaces being theoretically available (2 PRU MIIs + 2 ports from gigabit switch), or am I missing something?

over 4 years ago

+1 Chester Gillon over 4 years ago

Guru 92251 points

Looking at the AM335x Sitara Processors datasheet (Rev. L) the PRU-ICSS/MII1 and GEMAC_CPSW/MII2 ports share some of the same ZCZ balls, which I think explains the maximum of 3 PHYs which can be connected:

0 PaulM over 4 years ago

TI__Mastermind 28115 points

As Chester correctly states, the limitation of three Ethernet interfaces is due to the pin muxing of the device.

--Paul

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AM3358: 4 Ethernet ports