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COM20051I

Integrated Microcontroller and ARCNET (ANSI 878.1) Interface

SMSC -> Microchip 

Reconfigure

Timer has

Timed Out

Power On

Send

Reconfigure

Burst

Read Node ID

Write ID to

RAM Buffer

1

Set NID=ID

Start

Reconfiguration

Timer (840 mS)

Y

Invitation

N

to Transmit to

this ID?

N

Y

TA?

Broadcast?

N

Y

Send

Packet

Transmit

NAK

Transmit

ACK

Was Packet Y

Broadcast?

Y

Y RI?

Free Buffer

Enquiry to

this ID?

N

N

Y

N

SOH?

Y

N

RI?

Write SID

to Buffer

Transmit

Free Buffer

Enquiry

No

Activity

Y

DID Y

=0?

N for 74.7

Y

N us?

ACK?

N

Broadcast

N

DID

Enabled?

=ID?

Y

N

NAK?

Set TA

YN

Y

N

No

Activity

Y

for 74.7

us?

N

Set TA

N

Y

ACK?

Set TMA

Increment

NID

1

Y

No

Activity

for 74.7

us?

Write Buffer

with Packet

Pass the

Token

CRC N

N

OK?

Y

LENGTH N

OK?

Y

- ID refers to the identification number of the ID assigned to this node.

- NID refers to the next identification number that receives the token after

after this ID passes it.

- SID refers to the source identification.

- DID refers to the destination identification.

- SOH refers to the start of header character; preceeds all data packets.

Note*: Time values pertain to the default 2.5 Mbps operation

Y

DID

=0?

N

DID N

=ID?

Y

SEND ACK

Set RI

No Activity N

for 82

uS?

Y

Set NID=ID

Start Timer:

T=(255-ID)

x 146 us

Activity Y

On Line?

N

N

T=0?

Y

FIGURE 3 - DETAILED ARCNET CORE OPERATION

SMSC DS – COM20051I

Page 12

Rev. 03/27/2000

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