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CD1865 データシート(PDF) 3 Page - Intel Corporation |
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CD1865 データシート(HTML) 3 Page - Intel Corporation |
3 / 150 page Datasheet 3 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 |
同様の部品番号 - CD1865 |
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同様の説明 - CD1865 |
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