Datasheet

KSZ9031RNX
DS00002117F-page 61  2016-2017 Microchip Technology Inc.
FIGURE 7-4: MDC/MDIO TIMING
The typical MDC clock frequency is 2.5 MHz (400 ns clock period).
The KSZ9031RNX can operate with MDC clock frequencies generated from bit banging with GPIO pin in the 10s/100s
of Hertz and have been tested up to a MDC clock frequency of 8.33 MHz (120 ns clock period). Test condition for
8.33 MHz is for one KSZ9031RNX PHY on the MDIO line with a 1.0 k pull-up to the DVDDH supply rail.
TABLE 7-3: MDC/MDIO TIMING PARAMETERS
Timing
Parameter
Description Min. Typ. Max. Units
t
P
MDC period 120 400 —
ns
t
MD1
MDIO (PHY input) setup to rising edge of MDC 10 — —
t
MD2
MDIO (PHY input) hold from rising edge of MDC 10 — —
t
MD3
MDIO (PHY output) delay from rising edge of MDC 0 — —