TLK105 Datasheet, PDF (17/99 Pages) Texas Instruments – Industrial Temp, Single Port 10/100Mbs Ethernet Physical Layer Transceiver

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TLK105
TLK106
SLLSEB8A – AUGUST 2012 – REVISED MARCH 2013
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]
Transmit and receive-valid signals
RXD [3:0]
TX_EN
Line-status signals
RX_DV
CRS (carrier sense)
COL (collision)
Figure 4-1 shows the MII-mode signals.
PHY
TX_CLK
TX_EN
TXD [3:0]
RX_CLK
RX_DV
RX_ER
RXD [3:0]
CRS
COL
TX_CLK
TX_EN
TXD [3:0]
RX_CLK
RX_DV
RX_ER
RXD [3:0]
CRS
COL
MAC
Figure 4-1. MII Signaling
The isolate register 0.10 defined in IEEE802.3-2002 used to electrically isolate 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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Interfaces
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