LAN8187I SMSC [SMSC Corporation], LAN8187I Datasheet - Page 33

• Manufacturer Part Number: LAN8187I
• Description: High-Performance MII and RMII 10/100 Ethernet PHY with HP Auto-MDIX
• Manufacturer: SMSC [SMSC Corporation]

High-Performance MII and RMII 10/100 Ethernet PHY with HP Auto-MDIX
Datasheet
SMSC LAN8187/LAN8187I
MDIO
MDC
MDI0
MDC
Preamble
Preamble
32 1's
32 1's
The timing relationships of the MDIO signals are further described in
Interface (SMI) Timing," on page
Figure 4.7 MDIO Timing and Frame Structure - WRITE Cycle
Start of
Start of
0
Frame
Figure 4.6 MDIO Timing and Frame Structure - READ Cycle
0
Frame
1
1
1
0
Code
Code
OP
OP
0
1
A4 A3 A2 A1 A0 R4 R3 R2 R1 R0
A4 A3 A2 A1 A0 R4 R3 R2 R1 R0
PHY Address
PHY Address
Data To Phy
Read Cycle
Write Cycle
53.
DATASHEET
Data To Phy
33
Register Address
Register Address
Around
Around
Turn
Turn
Section 6.1, "Serial Management
D15
D15
D14
D14
Data From Phy
Revision 0.6 (02-24-06)
Data
Data
...
...
...
...
D1
D1
D0
D0