CD1865 Datasheet, PDF (4/150 Pages) Intel Corporation – Intelligent Eight-Channel Communications Controller

CD1865 — Intelligent Eight-Channel Communications Controller
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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