Datasheet

Table Of Contents
MII_COL
MII_RXD_0
MII_RXD_1
MII_RXD_2
MII_RXD_3
2.2kW
VCC
PHYAD4=0 PHYAD3=0 PHYAD2=0 PHYAD1=1 PHYAD0=1
B0314-01
TLK100
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SLLS931BAUGUST 2009REVISED DECEMBER 2009
3.3 PHY Address
The 5 PHY address inputs pins are shared with the MII_RXD[3:0] pins and COL pin as shown in
Table 3-2.
Table 3-2. PHY Address Mapping
PIN # PHYAD FUNCTION RXD FUNCTION
24 PHYAD0 MII_COL
25 PHYAD1 MII_RXD_0
26 PHYAD2 MII_RXD_1
27 PHYAD3 MII_RXD_2
28 PHYAD4 MII_RXD_3
Each TLK100 or port sharing an MDIO bus in a system must have a unique physical address. With 5
address input pins, the TLK100 can support PHY Address values 0 (<00000>) through 31 (<11111>). The
address-pin states are latched into an internal register at device power-up and hardware reset. Because
all the PHYAD[4:0] pins have weak internal pull-down resistors, the default setting for the PHY address is
00000 (0x00h).
See Figure 3-1 for an example of a PHYAD connection to external components. In this example, the
PHYAD configuration results in address 00010 (0x02h).
Figure 3-1. PHYAD Configuration Example
Copyright © 2009, Texas Instruments Incorporated Configuration 15
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