LAN8808D datasheet(68/80 Pages) MICROCHIP

No. de pieza	LAN8808D

Descripción Electrónicos	4-Port Gigabit Ethernet Transceiver with QSGMII Support

PDF	80 Pages

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Fabricante Electrónico	MICROCHIP [Microchip Technology]

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68 / 80 page

LAN8808D

DS00005833C-page 68

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 6-17

The device can operate with MDC clock frequencies generated from bit banging in the 10s/100s of

Hertz.

Note 6-18

These values provide 2 ns margin beyond the IEEE specification.

FIGURE 6-5:

MDC/MDIO TIMING

TABLE 6-14:

MDC/MDIO TIMING VALUES

Symbol

Description

Min

Typ

Max

Unit

tclkp

MDC period

—

Note 6-17

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

4—

—

tsu

MDIO (write to PHY) input setup time to rising

edge of MDC

Note 6-18

——

tihold

MDIO (write to PHY) input hold time after rising

edge of MDC

Note 6-18

——

MDC

MDIO

tclkh

tclkl

tclkp

MDIO

tsu tihold

(Data-Out)

(Data-In)

tohold

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