COM20020I-HD SMSC, COM20020I-HD Datasheet - Page 14
![no-image](/images/manufacturer_photos/0/6/617/smsc_sml.jpg)
COM20020I-HD
Manufacturer Part Number
COM20020I-HD
Description
Network Controller & Processor ICs ARCNET Contrllr
Manufacturer
SMSC
Datasheet
1.COM20020I-HT.pdf
(69 pages)
Specifications of COM20020I-HD
Product
Controller Area Network (CAN)
Number Of Transceivers
1
Data Rate
5 Mbps
Supply Voltage (max)
5.5 V
Supply Voltage (min)
4.5 V
Supply Current (max)
40 mA
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Mounting Style
SMD/SMT
Package / Case
TQFP-48
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Acknowledgements
An Acknowledgement is used to acknowledge reception of a packet or as an affirmative response to FREE BUFFER
ENQUIRIES and is sent by the following sequence:
Negative Acknowledgements
A Negative Acknowledgement is used as a negative response to FREE BUFFER ENQUIRIES and is sent by the
following sequence:
SMSC COM20020I 3.3V Rev.E
5Mbps ARCNET (ANSI 878.1) Controller with 2K x 8 On-Chip RAM
BURST
ALERT
N data bytes where COUNT = 256-N (or 512-N for a long packet)
Two CRC (Cyclic Redundancy Check) characters. The CRC polynomial used is: X
An ALERT BURST
An ACK (ACKnowledgement--ASCII code 86H) character
An ALERT BURST
A NAK (Negative Acknowledgement--ASCII code 15H) character
ALERT BURST
ALERT BURST
SOH
SID
ACK
NAK
DID
DID
COUNT
DATASHEET
Page 14
data
data
CRC
16
+ X
15
CRC
+ X
2
+ 1.
Revision 09-11-06
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