Power On
Reconfigure
Timer has
Timed Out
Send
Reconfigure
Burst
Read Node ID
Write ID to
RAM Buffer
1
Set NID=ID
N
Y
Start
Reconfiguration
Timer (840 mS)
Invitation
to Transmit to
this ID?
N
Y
Y
N
Free Buffer
Enquiry to
this ID?
TA ?
Y
N
SOH?
Y
N
Transmi t
NAK
RI?
Y
N
RI?
Transmit
ACK
Write SID
to Buffer
N
No Activity
for 82
Broadcast?
Y
Transmit
Free Buffer
Enquiry
N
uS?
Y
DID
=0?
No
Send
Packet
Y
Y
Activity
for 74.7
us?
Set NID=ID
N
N
N
Broadcast
Enabled?
Y
N
ACK?
DID
=ID?
Start Timer:
T=(255-ID)
x 146 us
Y
Y
N
Y
Was Packet
Broadcast?
N
Set TA
Y
NAK?
1
Write Buffer
with Packet
N
Activity
On Line?
Y
No
Y
Pass the
Token
Activity
Set TA
N
for 74.7
us?
N
N
N
CRC
OK?
N
T=0?
No
Activity
Increment
NID
Y
N
Y
Y
N
Y
for 74.7
ACK?
Set TMA
us?
LENGTH
OK?
Y
Y
DID
=0?
Set RI
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.
N
N
DID
=ID?
SID refers to the source identification.
-
- DID refers to the destination identification.
Y
SOH refers to the start of header character; preceeds all data packets.
-
SEND ACK
Note*: Time values pertain to the default 2.5 Mbps operation
FIGURE 3 - DETAILED ARCNET CORE OPERATION
SMSC DS – COM20051I
Page 12
Rev. 03/27/2000
SMSC [ SMSC CORPORATION ]
