CD1284 Datasheet, PDF (3/176 Pages) Intel Corporation – IEEE 1284-Compatible Parallel Interface Controller with Two High-Speed Asynchronous Serial Ports

IEEE 1284-Compatible Parallel Interface Controller — CD1284
Contents
1.0
Overview ......................................................................................................................12
2.0
Conventions ...............................................................................................................15
2.1 Abbreviations.......................................................................................................15
2.2 Acronyms ............................................................................................................15
3.0
Pin Information..........................................................................................................17
3.1 Pin Diagram.........................................................................................................17
3.2 Pin List.................................................................................................................18
4.0
Register Summary ...................................................................................................24
4.1 Register Summary Tables...................................................................................24
4.2 Register Usage....................................................................................................27
5.0
Functional Description...........................................................................................31
5.1 Device Architecture .............................................................................................31
5.2 CPU Interface......................................................................................................33
5.2.1 Read Cycles ...........................................................................................33
5.2.2 Write Cycles ...........................................................................................34
5.2.3 Service-Acknowledge Cycles .................................................................34
5.2.4 DMA Cycles............................................................................................34
5.3 Serial Port Service Requests ..............................................................................35
5.3.1 Interrupts ................................................................................................36
5.3.2 DMAREQ* as Parallel Interrupt Source..................................................36
5.3.3 Serial Service Request Polling ...............................................................40
5.3.4 Daisy-Chaining Service Requests with CD1400s ..................................41
5.4 Parallel Port Service Requests............................................................................43
5.4.1 Hardware-Activated Context Switch, Parallel.........................................48
5.4.2 Software-Activated Context Switch, Parallel ..........................................49
5.5 Serial Data Reception and Transmission ............................................................49
5.5.1 Receiver Operation ................................................................................50
5.5.2 Receiver Timer Operations ....................................................................51
5.5.3 Receive Exceptions................................................................................52
5.5.4 Transmitter Operation ............................................................................54
5.6 Flow Control ........................................................................................................55
5.6.1 In-Band Flow Control..............................................................................55
5.6.2 Receiver In-Band Flow Control ..............................................................55
5.6.3 Out-of-Band Flow Control.......................................................................58
5.6.4 Modem Signals and General-Purpose I/O .............................................59
5.7 Receive Special Character Processing ...............................................................61
5.7.1 UNIX‚ Character Processing ..................................................................61
5.7.2 Non-UNIX‚ Receive Special Character Processing................................63
5.8 Transmit Special Character Processing ..............................................................67
5.8.1 Line Terminating Characters ..................................................................67
5.8.2 Embedded Transmit Commands............................................................67
5.8.3 Send Special Character Command........................................................68
5.9 Baud Rate Generation.........................................................................................72
Datasheet
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