LAN91C100FD_0601 Datasheet, PDF (9/78 Pages) SMSC Corporation – FEAST Fast Ethernet Controller with Full Duplex Capability

FEAST Fast Ethernet Controller with Full Duplex Capability
PQFP/TQFP
PIN NO.
42, 40-38,
36-33
59, 56,
49-47,
45-43,
69-67, 65,
64, 62-60,
81-76, 71,
70
84, 87, 88,
90, 91, 96,
99, 101,
100, 98, 89,
92, 103,
102, 104
97
31, 57, 73,
86
93
3
4
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
NAME
RAM Data
Bus
RAM Data
Bus
RAM
Address
Bus
Receive
DMA
Crystal 1
Crystal 2
Power
Analog
Power
Ground
Analog
Ground
Transmit
Enable
SYMBOL
RD0-RD7
RD8-
RD31
RA2-RA16
nROE
nRWE0-
RWE3
RCVDMA
XTAL1
XTAL2
VDD
AVDD
GND
AGND
TXEN
BUFFER
TYPE
I/O4 with
pullups
I/O4 with
pullups
O4
O4
O4
O4
Iclk
O4
DESCRIPTION
Bidirectional. Carries the local buffer memory
read and write data. Reads are always 32 bits
wide. Writes are controlled individually at the
byte level. Floated if FLTST=1 during RECEIVE
FRAME STATUS WORD writes for packet
forwarding information (RA2-RA16=0,
RCVDMA=1, nRWE0-nRWE3=0).
Bidirectional. Carries the local buffer memory
read and write data. Reads are always 32 bits
wide. Writes are controlled individually at the
byte level.
Outputs. This bus specifies the buffer RAM
doubleword being accessed by the
LAN91C100FD.
Output. Active low signal used to read a
doubleword from buffer RAM.
Outputs. Active low signals used to write any
byte, word or dword in RAM.
Output. This pin is active during LAN91C100FD
write memory cycles of receive packets.
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.
+5V analog power supply pins.
Ground pins.
Analog ground pin.
Output. Used for 10 Mbps ENDEC. This pin
stays low when MIISEL is high.
SMSC DS – LAN91C100FD Rev. D
Page 9
DATASHEET
Rev. 01-20-06