IP101G-DS-R01 datasheet(30/65 Pages) ETC

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IP101G

Data Sheet

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January 14, 2014

IP101G-DS-R01

4.3 MMD Control Register

MII register 13

page

MII

ROM R/W

Description

Default

MMD Access Control Register

13[15:14]

R/W Function

00 = address

01 = data, no post increment

10 = data, post increment on reads and writes

11 = data, post increment on writes only

13[13:5]

R/W Reserved

Write as 0, ignore on read

13[4:0]

R/W DEVAD

Device Address

MII register 14

page

MII

ROM

R/W

Description

Default

MMD Access Address Data Register

14[15:0]

R/W Address Data

If 13.15:14 = 00, MMD DEVAD’s address register.

Otherwise, MMD DEVAD’s data register as indicated by the

contents of its address register

Example 1, Read 0.3.20 (Read Data from MMD register 3.20 of PHY address 0):

Write 0.13 = 0x0003 //MMD DEVAD 3

Write 0.14 = 0x0014 //MMD Address 20

Write 0.13 = 0x4003 //MMD Data command for MMD DEVAD 3

//Read MMD Data from 0.3.20

Example 2, Write 1.7.60 = 0x3210 (Write 0x3210 Data to MMD register 7.60 of PHY address 1):

Write 1.13 = 0x0007 //MMD DEVAD 7

Write 1.14 = 0x003C //MMD Address 60

Write 1.13 = 0x4007 //MMD Data command for MMD DEVAD 7

Write 1.14 = 0x3210 //Write MMD Data 0x3210 to 1.7.60

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