LAN91C100FD datasheet(8/79 Pages) SMSC

8 / 79 page

FEAST Fast Ethernet Controller with Full Duplex Capability

Rev. 10/14/2002

Page 8

SMSC DS – LAN91C100FD Rev. D

PRELIMINARY

PQFP/TQFP

PIN NO.

NAME

SYMBOL

BUFFER

TYPE

DESCRIPTION

175

Asynchron-

ous Ready

ARDY

OD16

Open drain output. ARDY may be used when

interfacing asynchronous buses to extend

accesses. Its rising (access completion) edge is

controlled by the XTAL1 clock and, therefore,

asynchronous to the host CPU or bus clock.

106

nSynchron

ous Ready

nSRDY

O16

Output. This output is used when interfacing

synchronous buses and nVLBUS=0 to extend

accesses. This signal remains normally inactive,

and its falling edge indicates completion. This

signal is synchronous to the bus clock LCLK.

109

nReady

Return

nRDYRTN

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

Input. Used in asynchronous bus interfaces.

178

nWrite

Strobe

nWR

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.

EEPROM

Clock

EESK

Output. 4

µsec clock used to shift data in and

out of the serial EEPROM.

EEPROM

Select

EECS

Output. Serial EEPROM chip select. Used for

selection and command framing of the serial

EEPROM.

EEPROM

Data Out

EEDO

Output. Connected to the DI input of the serial

EEPROM.

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.

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.

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