91C100FDREVB Datasheet, PDF (7/68 Pages) SMSC Corporation – FEAST FAST ETHERNET CONTROLLER WITH FULL DUPLEX CAPABILITY

PQFP/TQFP
PIN NO.
84, 87, 88,
90, 91, 96,
99, 101, 100,
98, 89, 92,
103, 102,
104
97
NAME
RAM
Address
Bus
31, 57, 73,
86
93
3
4
Receive
DMA
Crystal 1
Crystal 2
5, 10, 23, 27,
41, 63, 74,
83, 85, 107,
119, 125,
132, 143,
165, 179,
186, 191
205
14, 32, 46,
50, 66, 75,
82, 94, 111,
116, 120,
122, 128,
134, 138,
169, 174,
180, 185,
200
203
2
201
208
207
Power
Analog
Power
Ground
Analog
Ground
Transmit
Enable
Transmit
Data
Carrier
Sense
Collision
Detect
206
Receive
Data
197
Transmit
Clock
199
Receive
Clock
DESCRIPTION OF PIN FUNCTIONS
BUFFER
SYMBOL TYPE
DESCRIPTION
RA2-RA16
O4
Outputs. This bus specifies the buffer RAM
doubleword being accessed by the
LAN91C100FD.
nROE
nRWE0-
RWE3
RCVDMA
XTAL1
XTAL2
VDD
O4
Output. Active low signal used to read a
doubleword from buffer RAM.
O4
Outputs. Active low signals used to write any byte,
word or dword in RAM.
O4
Output. This pin is active during LAN91C100FD
write memory cycles of receive packets.
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.
+5V power supply pins.
AVDD
GND
+5V analog power supply pins.
Ground pins.
AGND
TXEN
TXD
CRS
COL
RXD
TXC
RXC
Analog ground pin.
O4
O4
I with
pulldown
I with
pulldown
I with
pullup
I with
pullup
I with
pullup
Output. Used for 10 Mbps ENDEC. This pin stays
low when MIISEL is high.
Output. NRZ Transmit Data for 10 Mbps ENDEC
interface.
Input. Carrier sense from 10 Mbps ENDEC
interface. This pin is ignored when MIISEL is high.
Input. Collision detection indication from 10 Mbps
ENDEC interface. This pin is ignored when
MIISEL is high.
Input. NRZ Receive Data from 10 Mbps ENDEC
interface. This pin is ignored when MIISEL is high.
Input. 10 MHz transmit clock used in 10 Mbps
operation. This pin is ignored when MIISEL is
high.
Input. 10 MHz receive clock recovered by the 10
Mbps ENDEC. This pin is ignored when MIISEL is
high.
SMSC DS – LAN91C100FD REV. B
Page 7
Rev. 05/31/2000