CD1865 datasheet(4/150 Pages) INTEL

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CD1865 — Intelligent Eight-Channel Communications Controller

Datasheet

6.3.2

Unclocked Versus Clocked Bus Interface .............................................. 52

6.4

Interface Examples ............................................................................................. 54

6.4.1

Interfacing to 80X86-Family Processors ................................................ 55

6.4.2

Interfacing to 680X0-Family Processors ................................................ 55

6.4.3

Interfacing to the VME Bus .................................................................... 55

7.0

Serial Interfaces........................................................................................................ 58

7.1

Receiver Operation ............................................................................................. 58

7.1.1

Basic Operation...................................................................................... 58

7.1.2

Receive FIFO Operation ........................................................................ 58

7.1.3

FIFO Timer Operations .......................................................................... 60

7.1.4

Receive Service Requests ..................................................................... 60

7.1.5

Receive Good Data‰ Service Request ................................................. 61

7.1.6

Receive Exception Service Request ...................................................... 61

7.1.7

Types of Errors....................................................................................... 62

7.1.8

Types of Exceptions ............................................................................... 62

7.1.9

Flow-Control Characters ........................................................................ 63

7.1.10 Programming Notes ............................................................................... 68

7.2

Transmitter Operation ......................................................................................... 68

7.2.1

Basic Operation...................................................................................... 68

7.2.2

FIFO Operation ...................................................................................... 69

7.2.3

Transmit Service Requests .................................................................... 69

7.2.4

Special Transmitter Commands ............................................................. 70

7.2.5

Special Character Transmission by Send

Special Character Command ................................................................. 70

7.2.6

Embedded Transmit Commands............................................................ 70

7.2.7

Sending Breaks ...................................................................................... 71

7.2.8

Sending Inter-Character Delays ............................................................. 71

7.2.9

Summary of Special Transmitter Commands......................................... 71

7.3

Flow Control ........................................................................................................ 72

7.3.1

Receiver Flow Control ............................................................................ 72

7.3.2

Receiver Hardware (Out-of-Band) Flow Control .................................... 73

7.3.3

Receiver Software (In-Band) Flow Control............................................. 74

7.3.4

Transmitter Flow Control ........................................................................ 75

7.3.5

Transmitter Hardware (Out-of-Band) Flow Control ................................ 76

7.3.6

Transmitter Software (In-Band) Flow Control......................................... 76

7.4

Modem Signals and General-Purpose I/O .......................................................... 78

7.4.1

Generating Service Requests with Modem Pins .................................... 80

7.4.2

Using Modem Pins as General-Purpose I/O .......................................... 80

7.5

Testing the CD1865 — Loopback Tests ............................................................. 80

8.0

Programming ............................................................................................................. 83

8.1

Types of Registers .............................................................................................. 83

8.2

Access Duty Cycle .............................................................................................. 84

8.3

Accessing FIFOs Versus Other Registers .......................................................... 84

8.4

Initialization ......................................................................................................... 84

8.5

Global Register Initialization................................................................................ 86

8.6

Service Request Initialization .............................................................................. 86

8.7

Prescaler ............................................................................................................. 86

8.8

Channel Initialization and Changes..................................................................... 87

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