Datasheet

TX_CLK
TX_EN
TXD [3:0]
RX_CLK
RX_DV
RX_ER
RXD [3:0]
CRS
COL
PHY
MAC
TX_CLK
TX_EN
TXD [3:0]
RX_CLK
RX_DV
RX_ER
RXD [3:0]
CRS
COL
TLK110
www.ti.com SLLS901D –DECEMBER 2011–REVISED JANUARY 2014
4 Interfaces
4.1 Media Independent Interface (MII)
The Media Independent Interface (MII) is a synchronous 4-bit wide nibble data interface that connects the
PHY to the MAC in 100B-TX and 10B-T modes. The MII is fully compliant with IEEE802.3-2002 clause 22.
The MII signals are summarized below.
Data signals TXD [3:0]
RXD [3:0]
Transmit and receive-valid signals TX_EN
RX_DV
Line-status signals CRS (carrier sense)
COL (collision)
Figure 4-1 shows the MII-mode signals.
Figure 4-1. MII Signaling
The Isolate bit (BMCR register bit 10), defined in IEEE802.3-2002, electrically isolates the PHY from the
MII (if set, all transactions on the MII interface are ignored by the PHY).
Additionally, the MII interface includes the carrier sense signal CRS, as well as a collision detect signal
COL. The CRS signal asserts to indicate the reception of data from the network or as a function of
transmit data in Half Duplex mode. The COL signal asserts as an indication of a collision which can occur
during half-duplex operation when both transmit and receive operation occur simultaneously.
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