LAN91C111 Datasheet, PDF (13/125 Pages) SMSC Corporation – 10/100 Non-PCI Ethernet Single Chip MAC + PHY

LAN91C111
Pin No.
TQFP
QFP
Name
Symbol
Buffer
Type
Description
7
9
EEPROM Data EEDO
O4
Output. Connected to the DI input of the
Out
serial EEPROM.
8
10
EEPROM Data EEDI
I with
Input. Connected to the DO output of the
In
pulldown** serial EEPROM.
3-5
5-7
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)
EEPROM
pullup**
LAN91C111 accesses to the serial
EEPROM. Must be grounded if no
EEPROM is connected to the
LAN91C111.
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,
62, 77, 98,
110, 120
3, 35, 46,
64, 79,
100, 112,
122
Power
VDD
+3.3V Power supply pins.
11, 16
13, 18
Analog Power AVDD
+3.3V Analog power supply pins.
24, 39, 52,
57, 67, 72,
93, 103,
108, 117
26, 41, 54,
59, 69, 74,
95, 105,
110, 119
Ground
GND
Ground pins.
13, 19
15, 21
Analog Ground AGND
Analog Ground pins
21
23
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
pullup
convey LINK status (EPHSR bit 14).
28
30
nCNTRL
nCNTRL O12
General Purpose Control Pin
47
49
X25out
X25out
O12
25Mhz Output to external PHY
111
113
Transmit Enable TXEN100 O12
Output to MII PHY. Envelope to 100 Mbps
100 Mbps
transmission.
119
121
Carrier Sense CRS100 I with
Input from MII PHY. Envelope of packet
100 Mbps
pulldown reception used for deferral and backoff
purposes.
125
127
Receive Data RX_DV
I with
Input from MII PHY. Envelope of data
Valid
pulldown valid reception. Used for receive data
framing.
112
114
Collision Detect COL100 I with
Input from MII PHY. Collision detection
100 Mbps
pulldown input.
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DS00002276A-page 13