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10/100 Non-PCI Ethernet Single Chip MAC + PHY
Datasheet
SMSC LAN91C111 REV C 17 Revision 1.91 (08-18-08)
DATASHEET
9 11 EEPROM Clock EESK O4 Output. 4 μsec clock used to shift data in
and out of the serial EEPROM.
10 12 EEPROM
Select
EECS O4 Output. Serial EEPROM chip select.
Used for selection and command framing
of the serial EEPROM.
7 9 EEPROM Data
Out
EEDO O4 Output. Connected to the DI input of the
serial EEPROM.
8 10 EEPROM Data
In
EEDI I with
pulldown **
Input. Connected to the DO output of the
serial EEPROM.
3-5 5-7 I/O Base IOS0-IOS2 I with
pullup**
Input. External switches can be
connected to these lines to select
between predefined EEPROM
configurations.
68Enable
EEPROM
ENEEP I with
pullup**
Input. Enables (when high or open)
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
pullup
Input. General-purpose input port used to
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
100 Mbps
TXEN100 O12 Output to MII PHY. Envelope to 100
Mbps transmission.
119 121 Carrier Sense
100 Mbps
CRS100 I with
pulldown
Input from MII PHY. Envelope of packet
reception used for deferral and backoff
purposes.
PIN NO.
NAME SYMBOL
BUFFER
TYPE
DESCRIPTION
TQFP QFP