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參數(shù)資料
| 型號(hào)： | COM20019ILJP |
| 廠商： | STANDARD MICROSYSTEMS CORP |
| 元件分類： | 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 |
| 文件頁數(shù)： | 26/65頁 |
| 文件大?。?/td> | 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 32
SMSC COM20019I
DATASHEET
BIT
BIT NAME
SYMBOL
DESCRIPTION
4,3
Extended
Timeout 1,2
ET1, ET2
These bits allow the network to operate over longer
distances than the default maximum 32 miles by controlling
the Response, Idle, and Reconfiguration Times. All nodes
should be configured with the same timeout values for
proper network operation. For the COM20019I with a 20
MHz crystal oscillator, the bit combinations follow:
ET2
0
1
ET1
0
1
0
1
Response
Time (mS)
9.548
4.774
2.387
0.597
Idle Time
(mS)
10.496
5.248
2.624
0.656
Reconfig
Time (S)
13.44
6.72
Note: These values are for 312.5 Kbps and
RCNTMR[1,0]=00. Reconfiguration time is changed by the
RCNTMR1 and RCNTMR0 bits.
2
Backplane
BACK-
PLANE
A logic "1" on this bit puts the device into Backplane Mode
signaling which is used for Open Drain and Differential
Driver interfaces. This bit must be set to ‘1’ at the
COM20019I.
1,0
Sub Address 1,0
SUBAD
1,0
These bits determine which register at address 07 may be
accessed. The combinations are as follows:
SUBAD1
SUBAD0
Register
0
Tentative I
0
1
Node ID
1
0
Setup 1
1
Next ID
See also the Sub Address Register.
Table 6.10 - Setup 1 Register
BIT
BIT NAME
SYMBOL
DESCRIPTION
7
Pulse1 Mode
P1MODE
This bit determines the type of PULSE1 output driver used
in Backplane Mode. When high, a push/pull output is
used. When low, an open drain output is used. The
default is open drain.
6
Four NACKS
FOUR
NACKS
This bit, when set, will cause the EXNACK bit in the
Diagnostic Status Register to set after four NACKs to Free
Buffer Enquiry are detected by the COM20019I. This bit,
when reset, will set the EXNACK bit after 128 NACKs to
Free Buffer Enquiry. The default is 128.
5
Reserved
Do not set.
4
Receive All
RCVALL
This bit, when set, allows the COM20019I to receive all
valid data packets on the network, regardless of their
destination ID. This mode can be used to implement a
network monitor with the transmitter on- or off-line. Note
that ACKs are only sent for packets received with a
destination ID equal to the COM20019I's programmed
node ID. This feature can be used to put the COM20019I
in a 'listen-only' mode, where the transmitter is disabled
and the COM20019I is not passing tokens. Defaults low.
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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: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: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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