LAN8740A datasheet(83/136 Pages) MICROCHIP

部件名	LAN8740A

功能描述	Small Footprint MII/RMII 10/100 Energy Efficient Ethernet Transceiver with HP Auto-MDIX and flexPWR짰 Technology

PDF	136 Pages

Scroll/Zoom	100%

制造商	MICROCHIP [Microchip Technology]

网页	http://www.microchip.com

标志

83 / 136 page

 2013-2015 Microchip Technology Inc.

DS00001987A-page 83

LAN8740A/LAN8740Ai

To read or write an MMD register, the following procedure must be observed:

Write the MMD Access Control Register with 00b (address) for the MMD Function field and the desired MMD

device (3 for PCS, 7 for Auto-Negotiation) for the MMD Device Address (DEVAD) field.

Write the MMD Access Address/Data Register with the 16-bit address of the desired MMD register to read/write

within the previously selected MMD device (PCS or Auto-Negotiation).

Write the MMD Access Control Register with 01b (data) for the MMD Function field and choose the previously

selected MMD device (3 for PCS, 7 for Auto-Negotiation) for the MMD Device Address (DEVAD) field.

If reading, read the MMD Access Address/Data Register, which contains the selected MMD register contents. If

writing, write the MMD Access Address/Data Register with the register contents intended for the previously

selected MMD register.

LAN8740A 数据表(PDF) 83 Page - Microchip Technology