RGMII voltage levels

calypso

Hello.
Can anybody comment on the issue regarding RGMII voltage levels?
What I mean is the schematic MB-JM3-RK3568-V11-20210412.pdf
The signals GMAC1_TXD0_M1, GMAC1_TXD1_M1 are based on the 3,3V power domain.
On the other hand the signals GMAC1_TXD2_M1, GMAC1_TXD3_M1 are based on the 1,8V power domain.
And all these four signals are wired directly to the U28 RTL8211F-CG.
As we can see the RTL8211F-CG is configured as "RGMII Power Source = 1,8V (default)".
So, is it possible to use RGMII TX 3,3V-levels with RTL8211F-CG 1,8V powered IOs?

calypso

Solved.
Dear support (if you exist at all).
Kindly look for the mistakes in the Core-3568J Product Specification.pdf (V1.0).
It contains wrong "IO Power domain" values in the table.

zyk

sorry, the io is 1.8V. please refer to Product SpecificationV2.1

https://download.t-firefly.com/% ... A6.pdf?v=1620639527

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devotedannual

RGMII employs LVTTL or LVCMOS signals, which are digital signals with low logic voltages. 3.3V, 2.5V, or 1.8V, depending on the chip architecture or FPGA/ASIC platform utilized. However, many modern systems choose 1.8V to reduce power consumption and electromagnetic interference (EMI).

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