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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： | 27/65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
SMSC COM20019I
Page 33
Rev. 09-25-07
DATASHEET
BIT
BIT NAME
SYMBOL
DESCRIPTION
3,2,1
Clock Prescaler
Bits 3,2,1
CKP3,2,1
These bits are used to determine the data rate of the
COM20019I. The following table is for a 20 MHz crystal:
CKP3
0
1
CKP2
1
0
CKP1
1
0
DIVISOR
64
128
SPEED
312.5 Kbs
156.25 Kbs
Note: The lowest data rate achievable by the COM20019I
is 156.25 Kbs. Defaults to 011 or 312.5 Kbps.
0
Slow Arbitration
Select
SLOWARB
This bit, when set, will divide the arbitration clock by 2.
Memory cycle times will increase when slow arbitration is
selected.
Defaults to low.
Table 6.11 - Setup 2 Register
BIT
BIT NAME
SYMBOL
DESCRIPTION
7
Read Bus Timing
Select
RBUSTMG This bit is used to Disable/Enable the High Speed CPU
Read function for High Speed CPU bus support.
RBUSTMG=0: Disable (Default), RBUSTMG=1: Enable. It
does not influence write operation. High speed CPU Read
operation is only for non-multiplexed bus.
6,5,4
Reserved
These bits are undefined.
3
Enhanced
Functions
EF
This bit is used to enable the new enhanced functions in the
COM20019I. EF = 0: Disable (Default), EF = 1: Enable. If
EF = 0, the timing and function is the same as in the
COM20020, Revision B. See appendix “A”. EF bit must be
‘1’ if the data rate is over 5Mbps.
EF bit should be ‘1’ for new design customers.
EF bit should be ‘0’ for replacement customers.
2
No Synchronous
NOSYNC
This bit is used to enable the SYNC command during
initialization. NOSYNC= 0, Enable (Default) The line must
be idle for the RAM initialization sequence to be written.
NOSYNC= 1, Disable:) The line does not have to be idle for
the RAM initialization sequence to be written. See appendix
“A”.
1,0
Reconfiguration
Timer 1, 0
RCNTM1,
0
These bits are used to program the reconfiguration timer as
a function of maximum node count. These bits set the time
out period of the reconfiguration timer as shown below. The
time out periods shown are for 312.5 Kbps.
RCNTM1
RCNTM0
Time Out
Period
Max Node Count
0
6.72 S
Up to 255 nodes
0
1
1.68 S
Up to 64 nodes
1
0
840 mS
Up to 32 nodes
1
420 mS*
Up to 16 nodes
Note*: The node ID value 255 must exist in the network for
420 mS timeout to be valid.
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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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