COM90C66 datasheet(3/76 Pages) SMSC

3 / 76 page

For other machines, the IOCHRDY signal may

be briefly negated to give the device the extra

time necessary to support the faster machines.

Aside from the implementation of a 16-bit data

bus interface, the remaining bus interface logic

identical

that

found

the

SMSC

COM90C65, which contains all the support logic

circuitry.

The ARCNET Local Area Network is a token

passing network which operates at a 2.5 Mbps

data rate.

A token passing protocol provides

predictable

response

times

because

each

network event occurs within a known time

interval.

Throughput can be reliably predeter-

mined based upon the number of nodes and

their expected traffic.

The

COM90C66

establishes

the

network

configuration and automatically reconfigures the

token passing order as new nodes are added or

deleted from the network.

The COM90C66 performs address recognition,

CRC

checking

and

generation,

packet

acknowledgement,

and

other

network

management

functions.

The

C0M90C66

interfaces

directly

the

IBM

PC/AT

compatibles. The internal 2K x 8 RAM buffer is

used to hold up to four data packets with a

maximum length of 508 bytes each.

PIN CONFIGURATION

AEN

GND

D10

D11

D12

D13

D14

D15

INTR

nBSLED

nTXLED

nPROM

nPULSE1

nPULSE2

RXIN

CLK

CACLK

nTOPH

nIOR

nIOW

nMEMR

nMEMW

GND

nIOCS16

nMEMCS16

9 8 7 6 5 4 3 2 1 84 83 82 81 80 79 78 77 76 75

11 10

33 34 35 36 37 38

40 41 42 43 44 45 46 47 48 49 50 51 52 53

IOCHRDY

nOWS

nSBHE

BALE

PACKAGE: 84-Pin PLCC

Ordering Information: COM90C66 LJP

nTOPL

COM90C66

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