10/100 Non-PCI Ethernet Single Chip MAC + PHY
Datasheet
PIN NO.
BUFFER
TYPE
NAME
SYMBOL
DESCRIPTION
TQFP
QFP
125
127
Receive Data
Valid
RX_DV
I with
Input from MII PHY. Envelope of data
valid reception. Used for receive data
framing.
pulldown
112
114
Collision Detect COL100
100 Mbps
I with
Input from MII PHY. Collision detection
input.
pulldown
113-116
109
115-118
111
Transmit Data
TXD3-
TXD0
O12
Outputs. Transmit Data nibble to MII
PHY.
Transmit Clock TX25
I with
Input. Transmit clock input from MII.
Nibble rate clock (25MHz for 100Mbps &
2.5MHz for 10Mbps).
pullup
118
120
Receive Clock
Receive Data
RX25
I with
Input. Receive clock input from MII PHY.
Nibble rate clock. (25MHz for 100Mbps &
2.5MHz for 10Mbps).
pullup
121-124
25
123-126
27
RXD3-
RXD0
I with
Inputs. Received Data nibble from MII
PHY.
pullup
Management
Data Input
MDI
I with
MII management data input.
pulldown
26
28
Management
Data Output
MDO
O4
O4
MII management data output.
MII management clock.
27
29
Management
Clock
MCLK
126
128
Receive Error
RX_ER
I with
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).
pulldown
2
4
nChip Select
Output
nCSOUT
RBIAS
O4
NA
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
Transmit Current Set. An external
resistor connected between this pin and
GND will set the output current for the TP
transmit outputs
14
15
17
18
22
23
16
17
19
20
24
25
TPO+
TPO-
TPI+
O/I
Twisted Pair Transmit Output, Positive.
Twisted Pair Transmit Output, Negative
Twisted Pair Receive Input, Positive
Twisted Pair Receive Input, Negative.
PHY LED Output
O/I
I/O
TPI-
I/O
nLEDA
nLEDB
OD24
OD24
PHY LED Output
Note 5.1 If the EEPROM is enabled.
Revision 1.8 (07-13-05)
SMSC LAN91C111-REV B
DATA2S6HEET
SMSC [ SMSC CORPORATION ]
