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10/100 Non-PCI Ethernet Single Chip MAC + PHY
Datasheet
Revision 1.91 (08-18-08) 18 SMSC LAN91C111 REV C
DATASHEET
Note 5.1 If the EEPROM is enabled.
125 127 Receive Data
Valid
RX_DV I with
pulldown
Input from MII PHY. Envelope of data
valid reception. Used for receive data
framing.
112 114 Collision Detect
100 Mbps
COL100 I with
pulldown
Input from MII PHY. Collision detection
input.
113-116 115-118 Transmit Data TXD3-
TXD0
O12 Outputs. Transmit Data nibble to MII
PHY.
109 111 Transmit Clock TX25 I with
pullup
Input. Transmit clock input from MII.
Nibble rate clock (25MHz for 100Mbps &
2.5MHz for 10Mbps).
118 120 Receive Clock RX25 I with
pullup
Input. Receive clock input from MII PHY.
Nibble rate clock. (25MHz for 100Mbps &
2.5MHz for 10Mbps).
121-124 123-126 Receive Data RXD3-
RXD0
I with
pullup
Inputs. Received Data nibble from MII
PHY.
25 27 Management
Data Input
MDI I with
pulldown
MII management data input.
26 28 Management
Data Output
MDO O4 MII management data output.
27 29 Management
Clock
MCLK O4 MII management clock.
126 128 Receive Error RX_ER I with
pulldown
Input. Indicates a code error detected by
PHY. Used by the LAN91C111 to discard
the packet being received. The error
indication reported for this event is the
same as a bad CRC (Receive Status
Word bit 13).
2 4 nChip Select
Output
nCSOUT O4 Output. Chip Select provided for
mapping of PHY functions into
LAN91C111 decoded space. Active on
accesses to LAN91C111’s eight lower
addresses when the BANK SELECTED is
7.
12 14 External
Resistor
RBIAS NA Transmit Current Set. An external
resistor connected between this pin and
GND will set the output current for the TP
transmit outputs
14 16 TPO+ O/I Twisted Pair Transmit Output, Positive.
15 17 TPO- O/I Twisted Pair Transmit Output, Negative
17 19 TPI+ I/O Twisted Pair Receive Input, Positive
18 20 TPI- I/O Twisted Pair Receive Input, Negative.
22 24 nLEDA OD24 PHY LED Output
23 25 nLEDB OD24 PHY LED Output
PIN NO.
NAME SYMBOL
BUFFER
TYPE
DESCRIPTION
TQFP QFP