91C94 Datasheet, PDF (13/120 Pages) SMSC Corporation – ISA/PCMCIA SINGLE CHIP ETHERNET CONTROLLER WITH RAM

PIN NUMBER
VTQFP/
QFP TQFP
NAME
96
94 Crystal 1
97
95 Crystal 2
SYMBOL
XTAL1
XTAL2
85
83 AUI Receive RECP
84
82
RECN
79
77 AUI
TXP/
78
76 Transmit
nCOLL
TXN/nCRS
BUFFER
TYPE
Iclk
Diff. Input
Diff.
Output
DESCRIPTION
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 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
I
EXTERNAL ENDEC - (nXENDEC pin
tied low). In this mode the pins are
inputs used for collision and carrier
sense functions
83
81 AUI
82
80 Collision
COLP
COLN
Diff.
Input
AUI collision differential inputs. A
collision is indicated by a 10MHz signal
at this input pair
87
85 TPE
TPERXP
Diff. 10BASE-T receive differential inputs
86
84 Receive
TPERXN
Input
77
75 TPE
TPETXP
Diff. INTERNAL ENDEC - 10BASE-T
75
73 Transmit
TPETXN Output transmit differential outputs
74
72 TPE
TPETXDP
Diff. 10BASE-T delayed transmit differential
76
74 Transmit
TPETXDN Output outputs. Used in combination with
Delayed
TPETXP and TPETXN to generate the
10BASE-T transmit pre-distortion
68
66 Transmit PWRDWN/ I with INTERNAL ENDEC - Powerdown
Clock
TXCLK
pullup input. It keeps the LAN91C94 in
powerdown mode when high (open).
Must be low for normal operation
90
88 Bias
Resistor
RBIAS
Analog
Input
13
EXTERNAL ENDEC - Transmit clock
input from external ENDEC.
A 22kohm 1% resistor should be
connected between this pin and analog
ground