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LAN91C100 Datasheet(PDF) 7 Page - SMSC Corporation

Part # LAN91C100
Description  FEAST??Fast Ethernet Controller
Download  101 Pages
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Manufacturer  SMSC [SMSC Corporation]
Direct Link  http://www.smsc.com
Logo SMSC - SMSC Corporation

LAN91C100 Datasheet(HTML) 7 Page - SMSC Corporation

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DESCRIPTION OF PIN FUNCTIONSOF PIN FUNCTIONSPIN FUNCTIONS
PQFP/TQFP
PIN NO.
NAME
SYMBOL
BUFFER
TYPE
DESCRIPTION
42,
40-38,
36-33, 59,56,
49-47,
45-43,
69-67, 65,64,
62-60,
81-76, 71,70
RAM Data
Bus
RD0-RD31
I/O4P
Bidirectional.
Carries
the
local
buffer
memory read and write data.
Reads are
always 32 bits wide. Writes are controlled
individually at the byte level.
84,87,
88,90,
91,96,
99,101,
100,98,
89,92,
103,102,
104
RAM
Address
Bus
RA2-RA16
O4
Outputs. This bus specifies the buffer RAM
doubleword
being
accessed
by
the
LAN91C100.
97
nROE
O4
Output.
Used to read a doubleword from
buffer RAM.
31,57,
73,86
nRWE0-
RWE3
O4
Outputs.
Used to write any byte, word or
dword in RAM.
93
nReceive
DMA
nRCVDMA
O4
Output.
This
pin
is
active
during
LAN91C100 write memory cycles of receive
packets.
3
4
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.
5,10,
23,27,
41,63,
74,83,
85,107,
119,125,
132,143,
165,179,
186,191
Power
VDD
+5V power supply pins.
205
Analog
Power
AVDD
+5V analog power supply pin.


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