LAN8804 datasheet(76/91 Pages) MICROCHIP

76 / 91 page

LAN8804

DS00003591G-page 76

6.6.5

MDC/MDIO TIMING

This section specifies the MDC/MDIO timing of the device. These timing numbers are valid for high-speed MDIO oper-

ation using push-pull MDIO buffers.

Note 6-19

The device can operate with

MDC clock frequencies generated from bit banging in the 10s/100s of

Hertz.

Note 6-20

These values provide 2 ns margin beyond the IEEE specification.

FIGURE 6-5:

MDC/MDIO TIMING

TABLE 6-18: MDC/MDIO TIMING VALUES

Symbol

Description

Min

Typ

Max

Units

tclkp

MDC period

—

Note 6-19

tclkh

MDC high time

—

tclkl

MDC low time

—

tval

MDIO (read from PHY) output valid from rising

MDIO of MDC

—

tohold

MDIO (read from PHY) output hold from rising

edge of

MDC

—

tsu

MDIO (write to PHY) input setup time to rising

edge of

MDC

Note 6-20

—

tihold

MDIO (write to PHY) input hold time after rising

edge of

MDC

Note 6-20

—

MDC

MDIO

tclkh

tclkl

tclkp

MDIO

tsu tihold

(Data-Out)

(Data-In)

tohold

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