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LAN91C100FD 数据表(PDF) 6 Page - SMSC Corporation

部件名 LAN91C100FD
功能描述  FEAST Fast Ethernet Controller with Full Duplex Capability
Download  67 Pages
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制造商  SMSC [SMSC Corporation]
网页  http://www.smsc.com
标志 SMSC - SMSC Corporation

LAN91C100FD 数据表(HTML) 6 Page - SMSC Corporation

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SMSC DS – LAN91C100FD REV. B
Page 6
Rev. 01-20-06
DESCRIPTION OF PIN FUNCTIONS
PQFP/TQFP
PIN NO.
NAME
SYMBOL
BUFFER
TYPE
DESCRIPTION
109
nReady
Return
nRDYRTN
I
Input. This input is used to complete synchronous
read cycles. In EISA burst mode it is sampled on
falling LCLK edges, and synchronous cycles are
delayed until it is sampled high.
176,
187-189
Interrupt
INTR0-
INTR3
O24
Outputs. Only one of these interrupts is selected to
be used; the other three are tri-stated.
The
selection is determined by the value of INT SEL 1-
0 bits in the Configuration Register.
108
nLocal
Device
nLDEV
O16
Output. This active low output is asserted when
AEN
is
low
and
A4-A15
decode
to
the
LAN91C100FD address programmed into the high
byte of the Base Address Register. nLDEV is a
combinatorial decode of unlatched address and
AEN signals.
177
nRead
Strobe
nRD
IS
Input. Used in asynchronous bus interfaces.
178
nWrite
Strobe
nWR
IS
Input. Used in asynchronous bus interfaces.
190
nData Path
Chip
Select
nDATACS
I with
pullup
Input. When nDATACS is low, the Data Path can
be accessed regardless of the values of AEN, A1-
A15 and the content of the BANK SELECT
Register.
nDATACS provides an interface for
bursting to and from the LAN91C100FD 32 bits at
a time.
54
EEPROM
Clock
EESK
O4
Output. 4
μsec clock used to shift data in and out
of the serial EEPROM.
55
EEPROM
Select
EECS
O4
Output.
Serial EEPROM chip select. Used for
selection and command framing of the serial
EEPROM.
52
EEPROM
Data Out
EEDO
O4
Output.
Connected to the DI input of the serial
EEPROM.
53
EEPROM
Data In
EEDI
I with
pulldown
Input. Connected to the DO output of the serial
EEPROM.
13, 15, 16
I/O Base
IOS0-IOS2
I with
pullup
Input. External switches can be connected to these
lines to select between predefined EEPROM
configurations.
51
Enable
EEPROM
ENEEP
I with
pullup
Input.
Enables
(when
high
or
open)
LAN91C100FD accesses to the serial EEPROM.
Must be grounded if no EEPROM is connected to
the LAN91C100FD.
42, 40-38,
36-33
RAM Data
Bus
RD0-RD7
I/O4 with
pullups
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).
59, 56,
49-47,
45-43,
69-67, 65,
64, 62-60,
81-76, 71, 70
RAM Data
Bus
RD8-RD31
I/O4 with
pullups
Bidirectional. Carries the local buffer memory read
and write data. Reads are always 32 bits wide.
Writes are controlled individually at the byte level.


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