lan91c100fd Standard Microsystems Corp., lan91c100fd Datasheet - Page 6

• Manufacturer Part Number: lan91c100fd
• Description: Lan91c100fd Rev. B Feast Fast Ethernet Controller With Full Duplex Capability
• Manufacturer: Standard Microsystems Corp.

SMSC DS – LAN91C100FD REV. B
81-76, 71, 70
PQFP/TQFP
13, 15, 16
42, 40-38,
69-67, 65,
64, 62-60,
PIN NO.
187-189
59, 56,
49-47,
45-43,
36-33
176,
109
108
177
178
190
54
55
52
53
51
nReady
Return
Interrupt
nLocal
Device
nRead
Strobe
nWrite
Strobe
nData Path
Chip
Select
EEPROM
Clock
EEPROM
Select
EEPROM
Data Out
EEPROM
Data In
I/O Base
Enable
EEPROM
RAM Data
Bus
RAM Data
Bus
NAME
nRDYRTN
INTR0-
INTR3
nLDEV
nRD
nWR
nDATACS
EESK
EECS
EEDO
EEDI
IOS0-IOS2
ENEEP
RD0-RD7
RD8-RD31
SYMBOL
DESCRIPTION OF PIN FUNCTIONS
BUFFER
pulldown
I/O4 with
I/O4 with
pullups
pullups
TYPE
pullup
pullup
pullup
I with
I with
I with
I with
O24
O16
O4
O4
O4
IS
IS
I
Page 6
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.
Outputs. Only one of these interrupts is selected to
be used; the other three are tri-stated.
selection is determined by the value of INT SEL 1-
0 bits in the Configuration Register.
Output. This active low output is asserted when
AEN
LAN91C100FD address programmed into the high
byte of the Base Address Register. nLDEV is a
combinatorial decode of unlatched address and
AEN signals.
Input. Used in asynchronous bus interfaces.
Input. Used in asynchronous bus interfaces.
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.
bursting to and from the LAN91C100FD 32 bits at
a time.
Output. 4 µsec clock used to shift data in and out
of the serial EEPROM.
Output.
selection and command framing of the serial
EEPROM.
Output. Connected to the DI input of the serial
EEPROM.
Input. Connected to the DO output of the serial
EEPROM.
Input. External switches can be connected to these
lines to select between predefined EEPROM
configurations.
Input.
LAN91C100FD accesses to the serial EEPROM.
Must be grounded if no EEPROM is connected to
the LAN91C100FD.
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.
is
Serial EEPROM chip select. Used for
low and
Enables
nDATACS provides an interface for
DESCRIPTION
(when
A4-A15
high
decode
or
to
open)
Rev. 03-28-07
The
the