COM20020I3V-DZD-TR Standard Microsystems (SMSC), COM20020I3V-DZD-TR Datasheet - Page 10

• Manufacturer Part Number: COM20020I3V-DZD-TR
• Manufacturer: Standard Microsystems (SMSC)

Specifications of COM20020I3V-DZD-TR

• Number Of Transceivers: 1
• Operating Supply Voltage (typ): 3.3V
• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 28
• Lead Free Status / RoHS Status: Compliant

Revision 12-06-06
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* Reconfig timer is programmable via setup2 register bits 1, 0.
Note - All time values are valid for 5 Mbps.
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.
N
Reconfiguration
Timer (420 mS)*
N
Broadcast?
Start
Was Packet
Broadcast?
TA?
Packet
Send
for 37.4
Activity
ACK?
us?
No
N
N
Y
Reconfigure
Timer has
Timed Out
Y
Y
Y
N
Y
Set TMA
Transmit
Transmit
Set TA
NAK
ACK
Y
to Transmit to
Reconfigure
RAM Buffer
Write ID to
Set NID=ID
Invitation
Read Node ID
Power On
FIGURE 1 - COM20020I OPERATION
this ID?
Y
Burst
Send
Increment
Free Buffer
Transmit
Enquiry
RI?
NID
Y
Y
DATASHEET
ACK?
N
Y
Free Buffer
Enquiry to
N
N
this ID?
NAK?
Y
N
for 37.4
Activity
for 37.4
Activity
No
us?
N
us?
No
1
10
N
Y
Set TA
N
Pass the
Y
Token
RI?
5Mbps ARCNET (ANSI 878.1) Controller with 2K x 8 On-Chip RAM
SEND ACK
Y
Write Buffer
Write SID
to Buffer
with Packet
N
LENGTH
DID
=0?
N
Y
Y
=ID?
CRC
OK?
=ID?
OK?
1
SOH?
DID
=0?
DID
DID
N
Y
Y
N
Y
Y
N
N
N
N
Broadcast
Enabled?
Y
Set RI
N
N
Start Timer:
Set NID=ID
T=(255-ID)
No Activity
x 73 us
On Line?
Activity
T=0?
for 41
uS?
SMSC COM20020I 3.3V
Y
Y
N
Y
N