COM20019I-HT Standard Microsystems (SMSC), COM20019I-HT Datasheet - Page 11

• Manufacturer Part Number: COM20019I-HT
• Manufacturer: Standard Microsystems (SMSC)

Specifications of COM20019I-HT

• Number Of Transceivers: 1
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (min): 4.5V
• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Compliant

SMSC COM20019I 3.3V Rev.C
Cost Competitive ARCNET (ANSI 878.1) Controller with 2K x 8 On-Chip RAM
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* Reconfig timer is programmable via setup2 register bits 1, 0.
Note - All time values are valid for 312.5 Kbps.
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 (6.72 S)*
N
Broadcast?
Start
Was Packet
Broadcast?
TA?
Packet
for 597.6
Send
Activity
ACK?
us?
No
N
Y
N
Reconfigure
Timer has
Timed Out
Y
Y
Y
N
Y
Set TMA
Transmit
Transmit
Set TA
NAK
ACK
Y
Figure 3.1 - COM20019I 3V OPERATION
to Transmit to
Reconfigure
RAM Buffer
Write ID to
Set NID=ID
Read Node ID
Invitation
Power On
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
Page 11
N
for 597.6
for 597.6
Activity
Activity
No
us?
us?
N
No
1
N
Y
Set TA
N
Pass the
Y
Token
RI?
SEND ACK
Y
Write Buffer
Write SID
to Buffer
with Packet
N
LENGTH
DID
=0?
N
Y
Y
CRC
=ID?
OK?
OK?
SOH?
=ID?
DID
=0?
1
DID
DID
N
Y
Y
N
Y
Y
N
N
N
N
Broadcast
Enabled?
Y
Set RI
N
N
Start Timer:
x 1.168 mS
Set NID=ID
T=(255-ID)
No Activity
On Line?
Activity
T=0?
for 656
uS?
Y
Y
N
Rev. 11-07-08
Y
N