91C100FDREVB Datasheet, PDF (6/68 Pages) SMSC Corporation – FEAST FAST ETHERNET CONTROLLER WITH FULL DUPLEX CAPABILITY

PQFP/TQFP
PIN NO.
109
176,
187-189
108
177
178
190
54
55
52
53
13, 15, 16
51
42, 40-38,
36-33
59, 56,
49-47,
45-43,
69-67, 65,
64, 62-60,
81-76, 71, 70
NAME
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
DESCRIPTION OF PIN FUNCTIONS
BUFFER
SYMBOL TYPE
DESCRIPTION
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.
INTR0-
O24 Outputs. Only one of these interrupts is selected to
INTR3
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.
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.
nRD
IS
Input. Used in asynchronous bus interfaces.
nWR
IS
Input. Used in asynchronous bus interfaces.
nDATACS
EESK
EECS
EEDO
EEDI
IOS0-IOS2
ENEEP
RD0-RD7
RD8-RD31
I with
pullup
O4
O4
O4
I with
pulldown
I with
pullup
I with
pullup
I/O4 with
pullups
I/O4 with
pullups
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.
Output. 4 µsec clock used to shift data in and out
of the serial EEPROM.
Output. Serial EEPROM chip select. Used for
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.
Enables (when high or open)
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.
SMSC DS – LAN91C100FD REV. B
Page 6
Rev. 05/31/2000