Datasheet – SMSC LAN91C111 User Manual

Page 17

Advertising
background image

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.

6

8

Enable
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

Advertising