參數(shù)資料
型號： CD1865
廠商： Intel Corp.
英文描述： Intelligent Eight-Channel Communications Controller
中文描述： 智能八通道通信控制器
文件頁數(shù)： 3/150頁
文件大?。?/td> 871K
代理商： CD1865
Datasheet
3
Intelligent Eight-Channel Communications Controller — CD1865
Contents
1.0
Overview
......................................................................................................................10
1.1
Theory of Operation ............................................................................................10
Conventions
...............................................................................................................13
2.1
Abbreviations.......................................................................................................13
2.2
Acronyms ............................................................................................................13
Device Selection Considerations
......................................................................15
Pin Information
..........................................................................................................16
4.1
Pin Diagram.........................................................................................................16
4.2
Pin Assignments..................................................................................................17
Functional Description
...........................................................................................18
5.1
Introduction..........................................................................................................18
5.2
Internal Operation................................................................................................20
5.3
Service Request and Interrupt Operation............................................................26
5.3.1
Theory of Operation ...............................................................................26
5.3.2
Internal Implementation of the Service Request Logic...........................28
5.3.3
Priorities and Fair Share.........................................................................31
5.4
Types of Service Requests .................................................................................31
5.4.1
Receive Service Requests .....................................................................32
5.4.2
Transmit Service Requests ....................................................................35
5.4.3
Modem Signal Change Service Requests..............................................35
5.5
Implementing Service Requests..........................................................................35
5.5.1
Method 1a
—
Full Interrupt
–
Type A, Three-Level Interrupt
with Three-Level Acknowledge ..............................................................37
5.5.2
Method 1b
—
Full Interrupt
–
Type B, Three-Level
Interrupt with Single-Level Acknowledge ...............................................38
5.5.3
Method 2b
—
Interrupt Interface, Single-Level
Interrupt with Single-Level Acknowledge ...............................................39
5.5.4
Method 3b
—
Polled Interface................................................................40
5.5.5
Comparison of Interrupt and Polled Code Sequences...........................42
5.5.6
Cascading Service Requests with Multiple CD1865s ............................43
5.5.7
Multiple CD1865s without Cascading.....................................................44
5.5.8
Acknowledging Service Requests..........................................................44
System Bus Interface and System Clock
.......................................................46
6.1
System Interface Considerations ........................................................................47
6.2
System Clock and Bit Rate Options....................................................................47
6.2.1
System Clock .........................................................................................47
6.2.2
External Clock ........................................................................................47
6.2.3
1
￥
Clock Option......................................................................................48
6.2.4
Bit Rate Options.....................................................................................48
6.2.5
Maximum Throughput Limits..................................................................51
6.3
CD1865 Basic Bus Interface and Addressing.....................................................51
6.3.1
Intel
Versus Motorola
Interface Signals and Addressing......................51
2.0
3.0
4.0
5.0
6.0
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