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COM20020ILJP 데이터시트(PDF) 11 Page - Microchip Technology

부품명 COM20020ILJP
상세설명  5Mbps ARCNET (ANSI 878.1) Controller with 2K x 8 On-Chip RAM
PDF  72 Pages
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제조업체  MICROCHIP [Microchip Technology]
홈페이지  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

COM20020ILJP 데이터시트(HTML) 11 Page - Microchip Technology

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5Mbps ARCNET (ANSI 878.1) Controller with 2K x 8 On-Chip RAM
Datasheet
SMSC COM20020I Rev D
Page 11
Revision 12-05-06
DATASHEET
Figure 3.1 - COM20020ID Operation
Invitation
to Transmit to
this ID?
Y
N
Free Buffer
Enquiry to
this ID?
SOH?
YN
YN
RI?
Write SID
to Buffer
DID
=0?
DID
=ID?
Write Buffer
with Packet
CRC
OK?
LENGTH
OK?
DID
=0?
DID
=ID?
SEND ACK
N
Y
N
Y
N
Y
N
Broadcast
Enabled?
N
Y
N
No Activity
for 41
uS?
Y
N
Set NID=ID
Start Timer:
T=(255-ID)
Activity
On Line?
Y
N
T=0?
Set RI
RI?
Transmit
NAK
Transmit
ACK
Set NID=ID
Write ID to
RAM Buffer
Send
Reconfigure
Burst
Power On
Reconfigure
Timer has
Timed Out
Start
Reconfiguration
Timer (420 mS)*
TA?
Broadcast?
Transmit
Free Buffer
Enquiry
No
Activity
Pass the
Token
Set TA
Y
N
ACK?
NAK?
1
No
Activity
N
Y
Increment
NID
Send
Packet
Was Packet
Broadcast?
No
Activity
N
ACK?
Set TMA
Set TA
x 73 us
for 37.4
us?
for 37.4
us?
for 37.4
us?
Y
N
N
Y
Y
N
N
Y
N
N
N
N
1
Y
Y
Y
Y
Y
Y
Y
N
Y
Read Node ID
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.
-
YN
* Reconfig timer is programmable via setup2 register bits 1, 0.
Note - All time values are valid for 5 Mbps.



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