High Performance Single Chip Low Power 10/100 Ethernet Physical Layer Transceiver (PHY)
Datasheet
Table 3.1 MII Signals (continued)
PIN NO.
SIGNAL NAME
TYPE
DESCRIPTION
37
TX_ER
(TXD4)
I
I
MII Transmit Error: When driven high, the 4B/5B encode
process substitutes the Transmit Error code-group (/H/)
for the encoded data word. This input is ignored in
10BaseT operation.
In Symbol Interface (5B Decoding) mode, this signal
becomes the MII Transmit Data 4: the MSB of the 5-bit
symbol code-group.
48
33
CRS
O
O
Carrier Sense: Indicate detection of carrier.
RX_DV
Receive Data Valid: Indicates that recovered and
decoded data nibbles are being presented on RXD[3:0].
30
29
38
34
RXD2
RXD3
O
O
O
O
Receive Data 2: Bit 2 of the 4 data bits that sent by the
PHY in the receive path.
Receive Data 3: Bit 3 of the 4 data bits that sent by the
PHY in the receive path.
TX_CLK
RX_CLK
Transmit Clock: 25MHz in 100Base-TX mode. 2.5MHz in
10Base-T mode.
Receive Clock: 25MHz in 100Base-TX mode. 2.5MHz in
10Base-T mode.
Table 3.2 LED Signals
TYPE
PIN NO.
SIGNAL NAME
DESCRIPTION
16
SPEED100
O
LED1 – SPEED100 indication. Active indicates that the
selected speed is 100Mbps. Inactive indicates that the
selected speed is 10Mbps.
17
19
20
LINKON
O
O
O
LED2 – LINK ON indication. Active indicates that the Link
(100Base-TX or 10Base-T) is on.
ACTIVITY
FDUPLEX
LED3 – ACTIVITY indication. Active indicates that there
is Carrier sense (CRS) from the active PMD.
LED4 – DUPLEX indication. Active indicates that the PHY
is in full-duplex mode.
Table 3.3 Management Signals
TYPE DESCRIPTION
PIN NO.
SIGNAL NAME
26
MDIO
MDC
IO
Management Data Input/OUTPUT: Serial management
data input/output.
27
I
Management Clock: Serial management clock.
Rev. 0.6 (12-12-03)
6
SMSC LAN83C185
DATASHEET
SMSC [ SMSC CORPORATION ]
