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COM90C66 bảng dữ liệu(PDF) 8 Page - SMSC Corporation

tên linh kiện COM90C66
Giải thích chi tiết về linh kiện  ARCNET Controller/Transceiver with AT Interface and On-Chip RAM
PDF  76 Pages
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nhà sản xuất  SMSC [SMSC Corporation]
Trang chủ  http://www.smsc.com
Logo SMSC - SMSC Corporation

COM90C66 bảng dữ liệu(HTML) 8 Page - SMSC Corporation

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8
FIGURE 1 - COM90C66 OPERATION
Invitation
to Transmit to
this ID?
Y
N
Free Buffer
Enquiry to
this ID?
SOH?
Y
N
Y
N
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 82
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 (840 mS)
TA?
Broadcast?
Transmit
Free Buffer
Enquiry
No
Activity
Pass the
Token
Set TA
Y
N
ACK?
NAK?
No
Activity
N
Y
Increment
NID
Send
Packet
Was Packet
Broadcast?
No
Activity
N
ACK?
Set TMA
Set TA
x 146 us
for 74.7
us?
for 74.7
us?
for 74.7
us?
Y
N
N
Y
Y
N
N
Y
N
N
N
N
1
Y
Y
Y
Y
Y
Y
Y
N
Y
Read ID* From
Switches
1
*The ID set by the external switches is continually sampled during COM90C66
operation.
- 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 charcter; preceeds all data packets.



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