CD1865 datasheet(3/150 Pages) INTEL

tên linh kiện	CD1865

Giải thích chi tiết về linh kiện	Intelligent Eight-Channel Communications Controller

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nhà sản xuất	INTEL [Intel Corporation]

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Datasheet

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Intelligent Eight-Channel Communications Controller — CD1865

Contents

1.0

Overview ......................................................................................................................10

1.1

Theory of Operation ............................................................................................ 10

2.0

Conventions ...............................................................................................................13

2.1

Abbreviations....................................................................................................... 13

2.2

Acronyms ............................................................................................................13

3.0

Device Selection Considerations ......................................................................15

4.0

Pin Information..........................................................................................................16

4.1

Pin Diagram......................................................................................................... 16

4.2

Pin Assignments.................................................................................................. 17

5.0

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

6.0

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

Số phần tương tự - CD1865

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