lan91c100 Standard Microsystems Corp., lan91c100 Datasheet - Page 7

• Manufacturer Part Number: lan91c100
• Description: Feast ? Ast Ethernet Controller
• Manufacturer: Standard Microsystems Corp.

36-33, 59,56,
69-67, 65,64,
PQFP/TQFP
81-76, 71,70
103,102,
119,125,
132,143,
165,179,
PIN NO.
186,191
99,101,
100,98,
85,107,
40-38,
49-47,
45-43,
62-60,
84,87,
88,90,
91,96,
89,92,
31,57,
23,27,
41,63,
74,83,
73,86
5,10,
104
205
42,
97
93
3
4
DESCRIPTION OF PIN FUNCTIONSOF PIN FUNCTIONSPIN FUNCTIONS
RAM Data
Bus
RAM
Address
Bus
nReceive
DMA
Crystal 1
Crystal 2
Power
Analog
Power
NAME
RD0-RD31
RA2-RA16
nROE
nRWE0-
RWE3
nRCVDMA
XTAL1
XTAL2
VDD
AVDD
SYMBOL
BUFFER
TYPE
I/O4P
I
O4
O4
O4
O4
CLK
7
Bidirectional.
memory read and write data.
always 32 bits wide. Writes are controlled
individually at the byte level.
Outputs. This bus specifies the buffer RAM
doubleword
LAN91C100.
Output. Used to read a doubleword from
buffer RAM.
Outputs. Used to write any byte, word or
dword in RAM.
Output.
LAN91C100 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 pin.
This
DESCRIPTION
being
Carries the local buffer
pin
accessed
is
active
Reads are
by
during
the