COM20019I-DZD SMSC, COM20019I-DZD Datasheet - Page 10

• Manufacturer Part Number: COM20019I-DZD
• Description: IC CTRLR ARCNET 2KX8 RAM 28-PLCC
• Manufacturer: SMSC
• Series: ARCNETr

Specifications of COM20019I-DZD

• Controller Type: ARCNET Controller
• Interface: Differential
• Voltage - Supply: 4.5 V ~ 5.5 V
• Current - Supply: 20mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 28-PLCC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 638-1000-5

Rev. 09-25-07
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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 OPERATION
to Transmit to
Reconfigure
RAM Buffer
Set NID=ID
Write ID to
Read Node ID
Invitation
Power On
this ID?
Y
Send
Burst
Increment
DATASHEET
Free Buffer
RI?
Transmit
Enquiry
NID
Y
Y
ACK?
N
Y
Free Buffer
Enquiry to
N
N
this ID?
NAK?
Y
N
Page 10
Cost Competitive ARCNET (ANSI 878.1) Controller with 2K x 8 On-Chip RAM
for 597.6
Activity
for 597.6
Activity
No
us?
us?
N
No
1
N
Y
Set TA
N
Pass the
Y
Token
RI?
SEND ACK
Y
Write SID
to Buffer
Write 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:
x 1.168 mS
Set NID=ID
T=(255-ID)
No Activity
On Line?
Activity
T=0?
for 656
uS?
Y
SMSC COM20019I
Y
N
Y
N