SCD1284 datasheet(4/176 Pages) INTEL

4 / 176 page

CD1284 — IEEE 1284-Compatible Parallel Interface Controller

Datasheet

5.10

Serial Diagnostic Facilities — Loopback ............................................................. 73

5.11

Parallel Port FIFO and Data Pipeline Overview .................................................. 73

5.11.1 IEEE STD 1284 Protocols ...................................................................... 73

5.11.2 Bus Interface .......................................................................................... 74

5.11.3 Parallel Port FIFO .................................................................................. 74

5.11.4 Receive Direction ................................................................................... 75

5.11.5 Receiving Compressed Data.................................................................. 75

5.11.6 Stale Data (Stale, OneChar, and Timeout Status Bits) .......................... 76

5.11.7 Transmit Direction .................................................................................. 76

5.12

CD1284 Parallel Port Overview .......................................................................... 77

5.12.1 Terminology ........................................................................................... 77

5.12.2 Signal Names ......................................................................................... 77

5.12.3 State Machine ........................................................................................ 78

5.12.4 Configuration .......................................................................................... 78

5.12.5 Interrupts ................................................................................................ 79

5.12.6 Manual Mode ......................................................................................... 79

5.12.7 Control Signals....................................................................................... 79

5.12.8 Parallel Port Interface to the FIFO ......................................................... 80

5.12.9 1284 Negotiations .................................................................................. 80

5.12.10 Data Transfers ....................................................................................... 81

5.12.11 Compatible Mode Status ........................................................................ 81

5.13

1284 Parallel Protocol Support ........................................................................... 82

5.13.1 Compatibility Mode................................................................................. 82

5.13.2 Reverse-Nibble and Reverse-Byte Modes ............................................. 82

5.13.3 ID Request ............................................................................................. 82

5.13.4 ECP Mode .............................................................................................. 82

5.13.5 EPP Mode .............................................................................................. 83

5.14

Protocol Timing ................................................................................................... 83

5.15

General-Purpose I/O Port ................................................................................... 83

5.16

Parallel Port Interface.......................................................................................... 84

5.17

Hardware Configurations .................................................................................... 86

5.17.1 Interfacing to an Intel‚ Microprocessor-Based System ........................... 86

5.17.2 Interfacing to a Motorola‚ Microprocessor-Based System...................... 86

5.17.3 Interfacing to a National Semiconductor‚

Microprocessor-Based System86

6.0

Programming ............................................................................................................. 90

6.1

Overview ............................................................................................................. 90

6.2

Initialization ......................................................................................................... 90

6.2.1

Device Reset .......................................................................................... 90

6.2.2

Global Function Initialization .................................................................. 93

6.2.3

Serial Channel Initialization .................................................................... 93

6.3

Serial Poll Mode Examples ................................................................................. 94

6.3.1

Polling Routine Examples ...................................................................... 94

6.4

Hardware-Activated Service Examples............................................................... 97

6.4.1

Serial Receive Service ........................................................................... 97

6.4.2

Serial Transmit Service .......................................................................... 98

6.4.3

Modem Service ...................................................................................... 99

6.5

Parallel Channel Service Routines...................................................................... 99

6.5.1

Software-Activated Service Examples (Poll) ........................................ 100

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