參數(shù)資料
型號(hào)： COM20019ILJP
廠商： STANDARD MICROSYSTEMS CORP
元件分類(lèi)： 微控制器/微處理器
中文描述： 1 CHANNEL(S), 312.5K bps, LOCAL AREA NETWORK CONTROLLER, PQCC28
封裝： PLASTIC, LCC-28
文件頁(yè)數(shù)： 5/65頁(yè)
文件大?。?/td> 386K
代理商： COM20019ILJP
Cost Competitive ARCNET (ANSI 878.1) Controller with 2K x 8 On-Chip RAM
SMSC COM20019I
Page 13
Rev. 09-25-07
DATASHEET
This 656
μS is equal to the Response Time of 597.6 μS plus the time it takes the COM20019I to start
retransmitting another message (usually another INVITATION TO TRANSMIT).
4.5.3
Reconfiguration Time
If any node does not receive the token within the Reconfiguration Time, the node will initiate a NETWORK
RECONFIGURATION. The ET2 and ET1 bits of the Configuration Register allow the network to operate
over longer distances than the 32 miles stated earlier. Thelogic levels on these bits control the maximum
distances over which the COM20019I can operate by controlling the three timeout values described above.
For proper network operation, all COM20019I's connected to the same network must have the same
Response Time, Idle Time, and Reconfiguration Time.
4.6
LINE PROTOCOL
The ARCNET line protocol is considered isochronous because each byte is preceded by a start interval
and ended with a stop interval. Unlike asynchronous protocols, there is a constant amount of time
separating each data byte. On a 312.5 Kbps network, each byte takes exactly 11 clock intervals of 3.2
μS
each. As a result, one byte is transmitted every 35.2
μS and the time to transmit a message can be
precisely determined. The line idles in a spacing (logic "0") condition. A logic "0" is defined as no line
activity and a logic "1" is defined as a negative pulse of 1.6
S duration. A transmission starts with an
ALERT BURST consisting of 6 unit intervals of mark (logic "1"). Eight bit data characters are then sent,
with each character preceded by 2 unit intervals of mark and one unit interval of space. Five types of
transmission can be performed as described below:
4.6.1
Invitations To Transmit
An Invitation To Transmit is used to pass the token from one node to another and is sent by the following
sequence:
An ALERT BURST
An EOT (End Of Transmission: ASCII code 04H)
Two (repeated) DID (Destination ID) characters
ALERT
BURST
EOT
DID
4.6.2
Free Buffer Enquiries
A Free Buffer Enquiry is used to ask another node if it is able to accept a packet of data. It is sent by the
following sequence:
An ALERT BURST
An ENQ (ENQuiry: ASCII code 85H)
Two (repeated) DID (Destination ID) characters
ALERT
BURST
ENQ
DID
4.6.3
Data Packets
A Data Packet consists of the actual data being sent to another node. It is sent by the following sequence:
相關(guān)PDF資料
PDF描述
CP0603A2442CSTR
CP0805A0881ESTR
CP0805A1441BSTR
CP2101-GMR
CP2101
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
COM20019I-LJP 制造商:SMSC 制造商全稱(chēng):SMSC 功能描述:Low Cost ARCNET(ANSI 878.1) Controller with 2k X 8 On-Board RAM
COM20019ILJP3V 功能描述:網(wǎng)絡(luò)控制器與處理器 IC ARCNET Contrllr RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray
COM20019ILJPTR 功能描述:網(wǎng)絡(luò)控制器與處理器 IC Arcnet (ANSI 878.1) Controllr 2k x 8 Ram RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray
COM20019IP 制造商:Rochester Electronics LLC 功能描述:- Bulk
COM20020 制造商:SMSC 制造商全稱(chēng):SMSC 功能描述:COM20020 3.3V ULANC Universal Local Area Network Controller with 2K x 8 On-Board RAM
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