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| 型號： | 91C100FDREVB |
| 廠商： | SMSC Corporation |
| 英文描述： | FEAST FAST ETHERNET CONTROLLER WITH FULL DUPLEX CAPABILITY |
| 中文描述： | 宴快速以太網(wǎng)控制器以全雙工能力 |
| 文件頁數(shù)： | 66/68頁 |
| 文件大?。?/td> | 423K |
| 代理商： | 91C100FDREVB |
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SMSC DS – LAN91C100FD REV. B
Page 7
Rev. 05/31/2000
DESCRIPTION OF PIN FUNCTIONS
PQFP/TQFP
PIN NO.
NAME
SYMBOL
BUFFER
TYPE
DESCRIPTION
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
LAN91C100FD.
97
nROE
O4
Output. Active low signal used to read a
doubleword from buffer RAM.
31, 57, 73,
86
nRWE0-
RWE3
O4
Outputs. Active low signals used to write any byte,
word or dword in RAM.
93
Receive
DMA
RCVDMA
O4
Output. This pin is active during LAN91C100FD
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 pins.
14, 32, 46,
50, 66, 75,
82, 94, 111,
116, 120,
122, 128,
134, 138,
169, 174,
180, 185,
200
Ground
GND
Ground pins.
203
Analog
Ground
AGND
Analog ground pin.
2
Transmit
Enable
TXEN
O4
Output. Used for 10 Mbps ENDEC. This pin stays
low when MIISEL is high.
201
Transmit
Data
TXD
O4
Output. NRZ Transmit Data for 10 Mbps ENDEC
interface.
208
Carrier
Sense
CRS
I with
pulldown
Input.
Carrier sense from 10 Mbps ENDEC
interface. This pin is ignored when MIISEL is high.
207
Collision
Detect
COL
I with
pulldown
Input. Collision detection indication from 10 Mbps
ENDEC interface.
This pin is ignored when
MIISEL is high.
206
Receive
Data
RXD
I with
pullup
Input. NRZ Receive Data from 10 Mbps ENDEC
interface. This pin is ignored when MIISEL is high.
197
Transmit
Clock
TXC
I with
pullup
Input. 10 MHz transmit clock used in 10 Mbps
operation. This pin is ignored when MIISEL is
high.
199
Receive
Clock
RXC
I with
pullup
Input. 10 MHz receive clock recovered by the 10
Mbps ENDEC. This pin is ignored when MIISEL is
high.
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