TLK2208B Datasheet, PDF (25/40 Pages) Texas Instruments – 8-PORT GIGABIT ETHERNET TRANCSEIVER

MDIO management interface (continued)
MDC
TLK2208B
8ĆPORT GIGABIT ETHERNET TRANSCEIVER
SLLS578D − AUGUST 2003 − REVISED SEPTEMBER 2006
MDIO
32 1s
0
1
0
1
A4
A0
R4
R0
1 0 D15 D0
Preamble
SFD
PHY Address
Data
Idle
Register Address
Write Code
Turn Around
Figure 9. Management Interface Write Timing
The MDIO interface allows up to 32 (16-bit) internal registers. Sixteen registers are defined in Clause 22 of the
IEEE 802.3 specification. Additional registers are allowed for expanded functionality. The TLK2208B
implements five IEEE-defined registers. The TLK2208B also implements additional registers for expanded
functionality. The IEEE-defined registers and the expanded functionality registers are outlined in Table 5.
Table 5. MDIO Registers
REGISTER
ADDRESS
0
1
2,3
4−14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
REGISTER NAME
Control
Status
PHY identifier
Not applicable
Extended status
Control register 0
Control register 1
Control register 2
Control register 3
Control register 4
Control register 5
Loopback control
Reserved
Control register 6
Reserved
Status register 0
Status register 1
Status register 2
Status register 3
Test register 1
Test register 2
DEFINITION
IEEE 802.3-defined. See Table 6.
IEEE 802.3-defined. See Table 7.
IEEE 802.3-defined. See Table 8 and Table 9.
IEEE 802.3-defined. See Table 10.
Channel enable controls. See Table 11.
Various global controls. See Table 12.
Channels [A:B] preemphasis controls. See Table 13.
Channels [C:D] preemphasis controls. See Table 14.
Channels [E:F] preemphasis controls. See Table 15.
Channels [G:H] preemphasis controls. See Table 16.
Individual channel loopback controls. See. Table 17.
Reserved control/status register. See Table 18.
Various global controls, preemphasis PRBS, CTC, busy. See Table 19.
Reserved control/status register. See Table 20.
TI test individual channel status. See Table 21.
TI test individual channel status. See Table 22.
TI PRBS test status. See Table 23.
TI test register. See Table 24.
TI test control register. See Table 25.
TI test reserved register. See Table 26.
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