COM20022I3V-HT SMSC, COM20022I3V-HT Datasheet - Page 10

• Manufacturer Part Number: COM20022I3V-HT
• Description: IC CTRLR ARCNET 2KX8 RAM 48-TQFP
• Manufacturer: SMSC
• Series: ARCNETr

Specifications of COM20022I3V-HT

• Controller Type: ARCNET Controller
• Interface: Differential
• Voltage - Supply: 4.5 V ~ 5.5 V
• Current - Supply: 65mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 48-TQFP, 48-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 638-1004

Revision 09-27-07
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* Reconfig timer is programmable via setup2 register bits 1, 0.
Note - All time values are valid for 10Mbps.
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
Timer (210 mS)*
Reconfiguration
N
Broadcast?
Start
Was Packet
Broadcast?
TA?
Packet
Send
for 18.7
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 -
to Transmit to
Reconfigure
RAM Buffer
Set NID=ID
Write ID to
Invitation
Power On
Read Node ID
this ID?
Y
Send
Burst
Increment
Free Buffer
Transmit
Enquiry
RI?
DATASHEET
NID
Y
Y
ACK?
N
Y
Free Buffer
Enquiry to
N
N
this ID?
COM20022I Operation
NAK?
Y
N
Page 10
for 18.7
Activity
Activity
for 18.7
No
us?
us?
N
No
1
N
Y
Set TA
N
Pass the
Y
Token
10 Mbps ARCNET (ANSI 878.1) Controller with 2Kx8 On-Chip RAM
RI?
SEND ACK
Y
Write SID
to Buffer
Write Buffer
with Packet
N
LENGTH
DID
=0?
N
Y
Y
=ID?
CRC
OK?
OK?
SOH?
=ID?
1
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 36.5 us
On Line?
Activity
for 20.5
T=0?
uS?
Y
Y
N
SMSC COM20022I
Y
N
Datasheet