10/100 Non-PCI Ethernet Single Chip MAC + PHY
Datasheet
PIN NO.
NAME
BUFFER
TYPE
SYMBOL
DESCRIPTION
TQFP
QFP
9
11
EEPROM Clock EESK
O4
O4
Output. 4 µsec clock used to shift data in
and out of the serial EEPROM.
10
12
EEPROM
Select
EECS
Output. Serial EEPROM chip select.
Used for selection and command framing
of the serial EEPROM.
7
9
EEPROM Data EEDO
Out
O4
Output. Connected to the DI input of the
serial EEPROM.
8
10
5-7
EEPROM Data EEDI
In
I with
Input. Connected to the DO output of the
pulldown ** serial EEPROM.
3-5
I/O Base
IOS0-IOS2 I with
Input. External switches can be
pullup**
connected to these lines to select
between predefined EEPROM
configurations.
6
8
Enable
ENEEP
I with
Input. Enables (when high or open)
LAN91C111 accesses to the serial
EEPROM. Must be grounded if no
EEPROM is connected to the
LAN91C111.
EEPROM
pullup**
127, 128
1, 2
Crystal 1
Crystal 2
XTAL1
XTAL2
Iclk**
An external 25 MHz crystal is connected
across these pins. If a TTL clock is
supplied instead, it should be connected
to XTAL1 and XTAL2 should be left open.
XTAL1 is the 5V tolerant input of the
internal amplifier and XTAL2 is the output
of the internal amplifier.
1, 33, 44,
3, 35, 46,
Power
VDD
+3.3V Power supply pins.
62, 77, 98, 64, 79,
110, 120
100, 112,
122
11, 16
13, 18
Analog Power
AVDD
GND
+3.3V Analog power supply pins.
Ground pins.
24, 39, 52, 26, 41, 54, Ground
57, 67, 72, 59, 69, 74,
93, 103,
108, 117
95, 105,
110, 119
13, 19
21
15, 21
23
Analog Ground AGND
Analog Ground pins
Loopback
LBK
O4
Output. Active when LOOP bit is set
(TCR bit 1).
20
22
nLink Status
nLNK
I with
Input. General-purpose input port used to
convey LINK status (EPHSR bit 14).
pullup
28
30
nCNTRL
X25out
nCNTRL
X25out
O12
O12
O12
General Purpose Control Pin
25Mhz Output to external PHY
47
49
111
113
Transmit Enable TXEN100
100 Mbps
Output to MII PHY. Envelope to 100
Mbps transmission.
119
121
Carrier Sense
100 Mbps
CRS100
I with
Input from MII PHY. Envelope of packet
reception used for deferral and backoff
purposes.
pulldown
SMSC LAN91C111-REV B
Revision 1.8 (07-13-05)
DATA2S5HEET
SMSC [ SMSC CORPORATION ]
