PIMXRT406LCAF4A datasheet(70/100 Pages) NXP

70 / 100 page

i.MX RT1020 Crossover Processors for Industrial Products, Rev. 2, 03/2021

NXP Semiconductors

Electrical characteristics

4.8.4.1.4

MII serial management channel timing (ENET_MDIO and ENET_MDC)

The MDC frequency is designed to be equal to or less than 2.5 MHz to be compatible with the IEEE 802.3

MII specification. However the ENET can function correctly with a maximum MDC frequency of

15 MHz.

Figure 46 shows MII asynchronous input timings. Table 63 describes the timing parameters (M10–M15)

shown in the figure.

Figure 46. MII serial management channel timing diagram

4.8.4.2

RMII mode timing

In RMII mode, ENET_CLK is used as the REF_CLK, which is a 50 MHz ± 50 ppm continuous reference

clock. ENET_RX_EN is used as the ENET_RX_EN in RMII. Other signals under RMII mode include

ENET_TX_EN, ENET_TX_DATA[1:0], ENET_RX_DATA[1:0] and ENET_RX_ER.

Table 63. MII serial management channel timing

Characteristic

Min.

Max.

Unit

M10

ENET_MDC falling edge to ENET_MDIO output invalid (min.

propagation delay)

0—

M11

ENET_MDC falling edge to ENET_MDIO output valid (max.

propagation delay)

—5

M12

ENET_MDIO (input) to ENET_MDC rising edge setup

—

M13

ENET_MDIO (input) to ENET_MDC rising edge hold

—

M14

ENET_MDC pulse width high

40%

60%

ENET_MDC period

M15

ENET_MDC pulse width low

40%

60%

ENET_MDC period

ENET_MDC (output)

ENET_MDIO (output)

M14

M15

M10

M11

M12

M13

ENET_MDIO (input)

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