SCD1284 datasheet(3/176 Pages) INTEL

3 / 176 page

Datasheet

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

4.1

4.2

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

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