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COM20022ITQFP Datasheet(PDF) 11 Page - SMSC Corporation

Part # COM20022ITQFP
Description  10 MBPS ARCNET CONTROLLER WITH 2KX8 ON BOARD RAM
PDF  83 Pages
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Manufacturer  SMSC [SMSC Corporation]
Direct Link  http://www.smsc.com
Logo SMSC - SMSC Corporation

COM20022ITQFP Datasheet(HTML) 11 Page - SMSC Corporation

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10 Mbps ARCNET (ANSI 878.1) Controller with 2Kx8 On-Board RAM
Datasheet
SMSC COM20022I
Page 11
Rev. 08-18-03
DATASHEET
Invitation
to Transmit to
this ID?
Y
N
Free Buffer
Enquiry to
this ID?
SOH?
YN
YN
RI?
Write SID
to Buffer
DID
=0?
DID
=ID?
Write Buffer
with Packet
CRC
OK?
LENGTH
OK?
DID
=0?
DID
=ID?
SEND ACK
N
Y
N
Y
N
Y
N
Broadcast
Enabled?
N
Y
N
No Activity
for 20.5
uS?
Y
N
Set NID=ID
Start Timer:
T=(255-ID)
Activity
On Line?
Y
N
T=0?
Set RI
RI?
Transmit
NAK
Transmit
ACK
Set NID=ID
Write ID to
RAM Buffer
Send
Reconfigure
Burst
Power On
Reconfigure
Timer has
Timed Out
Start
Reconfiguration
Timer (210 mS)*
TA?
Broadcast?
Transmit
Free Buffer
Enquiry
No
Activity
Pass the
Token
Set TA
Y
N
ACK?
NAK?
1
No
Activity
N
Y
Increment
NID
Send
Packet
Was Packet
Broadcast?
No
Activity
N
ACK?
Set TMA
Set TA
x 36.5 us
for 18.7
us?
for 18.7
us?
for 18.7
us?
Y
N
N
Y
Y
N
N
Y
N
N
N
N
1
Y
Y
Y
Y
Y
Y
Y
N
Y
Read Node ID
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 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.
-
YN
* Reconfig timer is programmable via setup2 register bits 1, 0.
Note - All time values are valid for 10Mbps.
Figure 3.1 -
COM20022I Operation



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