Datasheet

MDC
ZZ
MDIO
(STA)
TA
Register Data
Z
Z
0 1 0 00 00 00 00 0 00 01 00 00 0 0 00 01 1 0 00 1 0
Idle
Idle
Start
Opcode
(Read)
PHY Address
(PHYAD = 0Ch)
Register Address
(00h = BMCR)
MDC
TA
Register Data
Z
Z
Z Z Z
0 0 0 00 00 00 00 0 00 00 00 00 0 00 01 1 1 11 1 1
Idle
Z
Z
MDIO
(STA)
MDIO
(PHY)
Idle Start
Opcode
(Read)
PHY Address
(PHYAD = 0Ch)
Register Address
(00h = BMCR)
TLK105
TLK106
www.ti.com SLLSEB8A –AUGUST 2012–REVISED MARCH 2013
For write transactions, the station-management entity writes data to the addressed TLK10x, thus
eliminating the requirement for MDIO Turnaround. The Turnaround time is filled by the management entity
by inserting <10>. Figure 4-4 shows the timing relationship for a typical MII register write access. The
frame structure and general read/write transactions are shown in Table 4-2, Figure 4-3, and Figure 4-4.
Table 4-2. Typical MDIO Frame Format
MII Management Serial Protocol <idle><start><op code><device addr><reg addr><turnaround><data><idle>
Read Operation <idle><01><10><AAAAA><RRRRR><Z0><xxxx xxxx xxxx xxxx><idle>
Write Operation <idle><01><01><AAAAA><RRRRR><10><xxxx xxxx xxxx xxxx><idle>
Figure 4-3. Typical MDC/MDIO Read Operation
Figure 4-4. Typical MDC/MDIO Write Operation
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