COM20022I Ver la hoja de datos (PDF) - SMSC -> Microchip
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COM20022I Datasheet PDF : 88 Pages
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Reconfigure
Timer has
Timed Out
Power On
Send
Reconfigure
Burst
Read Node ID
Write ID to
RAM Buffer
1
Set NID=ID
Start
Reconfiguration
Timer (210 mS)*
Y
Invitation
N
to Transmit to
this ID?
N
Y
TA?
Broadcast?
N
Y
Send
Packet
Transmit
NAK
Transmit
ACK
Y
Was Packet
Broadcast?
N
No
Activity
Y
for 18.7
us?
N
Set TA
N
Y
ACK?
Set TMA
Y
Free Buffer
Enquiry to
this ID?
Y
N
RI?
N
Y
N
SOH?
Y
N
RI?
Write SID
to Buffer
Transmit
Free Buffer
Enquiry
No
Activity
Y
DID Y
=0?
N for 18.7
Y
N us?
N
Broadcast
N
ACK?
DID
Enabled?
Y
N
NAK?
Set TA
=ID?
YN
Y
1
Write Buffer
with Packet
Pass the
Token
Increment
Y
No
Activity
N
NID
for 18.7
us?
CRC N
OK?
Y
LENGTH N
OK?
Y
- 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.
* Reconfig timer is programmable via setup2 register bits 1, 0.
Note - All time values are valid for 10Mbps.
Y
DID
=0?
N
DID N
=ID?
Y
SEND ACK
Set RI
No Activity
N
for 20.5
uS?
Y
Set NID=ID
Start Timer:
T=(255-ID)
x 36.5 us
Activity Y
On Line?
N
N
T=0?
Y
FIGURE 1 - COM20022 OPERATION
8
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