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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： | 21/65页 |
| 文件大小： | 386K |
| 代理商： | COM20019ILJP |
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Cost Competitive ARCNET (ANSI 878.1) Controller with 2K x 8 On-Chip RAM
Rev. 09-25-07
Page 28
SMSC COM20019I
DATASHEET
BIT
BIT NAME
SYMBOL
DESCRIPTION
2
Reconfiguration
RECON
This bit, if high, indicates that the Line Idle Timer has timed out
because the RXIN pin was idle for 656 S. The RECON bit is
cleared during a "Clear Flags" command. This bit, when set, will
cause an interrupt if the corresponding bit in the IMR is also set.
The interrupt service routine should consist of examining the
MYRECON bit of the Diagnostic Status Register to determine
whether there are consecutive reconfigurations caused by this
node.
1
Transmitter
Message
Acknowledged
TMA
This bit, if high, indicates that the packet transmitted as a result of
an "Enable Transmit from Page fnn" command has been
acknowledged. This bit should only be considered valid after the
TA bit (bit 0) is set. Broadcast messages are never
acknowledged. The TMA bit is cleared by issuing the "Enable
Transmit from Page fnn" command.
0
Transmitter
Available
TA
This bit, if high, indicates that the transmitter is available for
transmitting. This bit is set when the last byte of scheduled
packet has been transmitted out, or upon execution of a "Disable
Transmitter" command. The TA bit is cleared by issuing the
"Enable Transmit from Page fnn" command after the node next
receives the token. This bit, when set, will cause an interrupt if
the corresponding bit in the IMR is also set.
Table 6.4 - Diagnostic Status Register
BIT
BIT NAME
SYMBOL
DESCRIPTION
7
My
Reconfiguration
MY-
RECON
This bit, if high, indicates that a past reconfiguration was caused
by this node. It is set when the Lost Token Timer times out, and
should be typically read following an interrupt caused by RECON.
Refer to the Improved Diagnostics section for further detail.
6
Duplicate ID
DUPID
This bit, if high, indicates that the value in the Node ID Register
matches both Destination ID characters of the token and a
response to this token has occurred. Trailing zero's are also
verified. A logic "1" on this bit indicates a duplicate Node ID, thus
the user should write a new value into the Node ID Register. This
bit is only useful for duplicate ID detection when the device is off
line, that is, when the transmitter is disabled. When the device is
on line this bit will be set every time the device gets the token.
This bit is reset automatically upon reading the Diagnostic Status
Register. Refer to the Improved Diagnostics section for further
detail.
5
Receive
Activity
RCVACT
This bit, if high, indicates that data activity (logic "1") was
detected on the RXIN pin of the device. Refer to the Improved
Diagnostics section for further detail.
4
Token Seen
TOKEN
This bit, if high, indicates that a token has been seen on the
network, sent by a node other than this one. Refer to the
Improved Diagnostic section for further detail.
3
Excessive NAK
EXCNAK
This bit, if high, indicates that either 128 or 4 Negative
Acknowledgements have occurred in response to the Free Buffer
Enquiry. This bit is cleared upon the "POR Clear Flags"
command. Reading the Diagnostic Status Register does not
clear this bit. This bit, when set, will cause an interrupt if the
corresponding bit in the IMR is also set. Refer to the Improved
Diagnostics section for further detail.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| COM20019I-LJP | 制造商:SMSC 制造商全称:SMSC 功能描述:Low Cost ARCNET(ANSI 878.1) Controller with 2k X 8 On-Board RAM |
| COM20019ILJP3V | 功能描述:网络控制器与处理器 IC ARCNET Contrllr RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
| COM20019ILJPTR | 功能描述:网络控制器与处理器 IC Arcnet (ANSI 878.1) Controllr 2k x 8 Ram RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
| COM20019IP | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| COM20020 | 制造商:SMSC 制造商全称: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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