74.6.13.1 Ethernet MAC MDIO Mode

In MDIO mode, the MDC frequency must be less than or equal to 2.5 MHz to be compatible with the IEEE 802.3 MII specification.

Timings are provided in the following conditions:
  • 1.8V domain: VDDIO from 1.7V to 1.9V, maximum external capacitor = 10 pF, DRV= 1, SR = 1
  • 3.3V domain: VDDIO from 3.0V to 3.6V, maximum external capacitor = 10 pF, DRV= 0, SR = 1
Table 74-41. Ethernet MAC MDIO Interface Timings
Symbol Parameter Min Max Unit
GMAC1 MDIO input data setup time before MDC rising edge 10 – ns
GMAC2 MDIO input data hold time after MDC rising edge 0 – ns
GMAC3 MDC falling edge to MDIO output data valid 0 25 ns
Figure 74-39. Ethernet MAC MDIO Interface Timings