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LS1021A Ethernet interface - MII 2.5V/1.8V support

Question asked by fdm on May 3, 2017
Latest reply on May 4, 2017 by Serguei Podiatchev



I need to use both RGMII and MII interfaces simultaneously in a new LS1021A based board.

According to the LS1021A datasheet, all Ethernet interfaces should have the same supply voltage LVDD = L1VDD, and this voltage should be 1.8V or 2.5V when RGMII is used, but MII is specified at 3.3V only (unlike e.g. T1040 that has MII specifications at 2.5V and 3.3V).

Can the LS1021A Ethernet controller be used in MII mode with 2.5V and/or 1.8V supply? Is there any examples of such usage?