LAN91C96I Datasheet, PDF (17/110 Pages) SMSC Corporation – NON-PCI SINGLE-CHIP FULL DUPLES ETHERNET CONTROLLER

Non-PCI Single-Chip Full Duplex Ethernet Controller
PIN NO.
TQFP
QFP
1
3
91
93
PIN NAME
ENEEP
nEN16
TYPE
I with
pullup
**
I with
pullup
**
94
96
XTAL1
Iclk
**
95
97
XTAL2
Iclk
83
85
RECP/
Diff.
82
84
RECN
Input
**
77
79
TXP/nCOLL Diff.
76
78
TXN/nCRS Output
I
**
81
83
COLP
Diff.
80
82
COLN
Input
**
85
87
TPERXP
Diff.
84
86
TPERXN
Input
**
75
77
TPETXP
Diff.
73
75
TPETXN
Output
72
74
TPETXDP Diff.
74
76
TPETXDN Output
66
68
PWRDWN/ I with
TXCLK
pullup
**
88
90
RBIAS
90
92
nXENDEC
11,19,
48,59,
98,38
13,21,40, VDD
50,
61,100
Analog
Input
I with
pullup
**
DESCRIPTION
Input. This active high input enables the EEPROM to be read
or written by the LAN91C96I. Internally pulled up. Must be
connected to ground if no serial EEPROM is used.
Input. When low the LAN91C96I is configured for 16 bit bus
operation. If left open the LAN91C96I works in 8 bit bus
mode. 16 bit configuration can also be programmed via serial
EEPROM or software initialization of the CONFIGURATION
REGISTER.
An external parallel resonance 20MHz crystal should be
connected across these pins. If an external clock source is
used, it should be connected to this pin (XTAL1) and XTAL2
should be left open.
An external parallel resonance 20MHz crystal should be
connected across these pins. If an external clock source is
used, it should be connected to XTAL1 and this pin (XTAL2)
should be left open.
AUI receive differential inputs.
INTERNAL ENDEC - (nXENDEC pin open). In this mode
TXP and TXN are the AUI transmit differential outputs. They
must be externally pulled up using 150 ohm resistors.
EXTERNAL ENDEC - (nXENDEC pin tied low). In this mode
the pins are inputs used for collision and carrier sense
functions.
AUI collision differential inputs. A collision is indicated by a
10MHz signal at this input pair.
10BASE-T receive differential inputs.
INTERNAL ENDEC - 10BASE-T transmit differential outputs.
10BASE-T delayed transmit differential outputs. Used in
combination with TPETXP and TPETXN to generate the
10BASE-T transmit pre-distortion.
INTERNAL ENDEC - Powerdown input. It keeps the
LAN91C96I in powerdown mode when high (open). Must be
low for normal operation.
EXTERNAL ENDEC - Transmit clock input from external
ENDEC.
A resistor should be connected between this pin and analog
ground to determine the threshold level of the TP Receive,
AUI Receive, AUI Collision and AUI Transmit level.
When tied low the LAN91C96I is configured for EXTERNAL
ENDEC. When tied high or left open the LAN91C96I will use
its internal encoder/decoder.
+5.0V power supply pins or 3.3V power supply pins
SMSC DS – LAN91C96I
Page 17
DATASHEET
Rev. 11/18/2004