参数资料
型号: COM20019ILJP
厂商: STANDARD MICROSYSTEMS CORP
元件分类: 微控制器/微处理器
中文描述: 1 CHANNEL(S), 312.5K bps, LOCAL AREA NETWORK CONTROLLER, PQCC28
封装: PLASTIC, LCC-28
文件页数: 2/65页
文件大小: 386K
代理商: COM20019ILJP
Cost Competitive ARCNET (ANSI 878.1) Controller with 2K x 8 On-Chip RAM
Rev. 09-25-07
Page 10
SMSC COM20019I
DATASHEET
Figure 3.1 - COM20019I OPERATION
Invitation
to Transmit to
this ID?
Y
N
Free Buffer
Enquiry to
this ID?
SOH?
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 656
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 (6.72 S)*
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 1.168 mS
for 597.6
us?
for 597.6
us?
for 597.6
us?
Y
N
Y
N
Y
N
1
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 312.5 Kbps.
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