CD2481 datasheet(5/222 Pages) INTEL

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Datasheet

Programmable Four-Channel Communications Controller — CD2481

7.6.3

CRC Calculation in Bisync Mode ........................................................... 93

7.6.4

BCC Computation Formulas .................................................................. 94

7.6.5

Receive State Tables ............................................................................. 95

7.7

X.21 Call Set-Up Mode........................................................................................ 97

7.7.1

X.21 Transmit .........................................................................................97

7.7.2

X.21 Receive .......................................................................................... 97

7.8

Extended X.21 Mode........................................................................................... 99

7.8.1

Extended X.21 Transmit ......................................................................... 99

7.8.2

Extended X.21 Receive .......................................................................... 99

7.9

Programmable Sync.......................................................................................... 100

7.9.1

Programmable Sync Transmit.............................................................. 101

7.9.2

Programmable Sync Receive ............................................................... 101

7.10

Non-8-Bit Data Transfers .................................................................................. 102

8.0

Programming Examples......................................................................................103

8.1

Global Initialization ............................................................................................ 105

8.2

Async Interrupt Setup Example......................................................................... 107

8.3

HDLC DMA Channel Setup Example................................................................ 107

8.4

Receive DMA Interrupt Service Routine............................................................ 109

8.5

Transmit Interrupt Service Routine.................................................................... 110

8.6

Support Files from the Intel FTP Server............................................................ 110

9.0

Detailed Register Descriptions ........................................................................112

9.1

Global Registers................................................................................................ 112

9.1.1

Global Firmware Revision Code Register (GFRCR) ............................ 112

9.1.2

Channel Access Register (CAR) .......................................................... 112

9.2

Option Registers................................................................................................ 113

9.2.1

Channel Mode Register (CMR) ............................................................ 113

9.2.2

Channel Option Register 1 (COR1)...................................................... 114

9.2.3

Channel Option Register 2 (COR2)...................................................... 116

9.2.4

Channel Option Register 3 (COR3)...................................................... 123

9.2.5

Channel Option Register 4 (COR4)...................................................... 130

9.2.6

Channel Option Register 5 (COR5)...................................................... 131

9.2.7

Channel Option Register 6 (COR6)...................................................... 132

9.2.8

Channel Option Register 7 (COR7)...................................................... 135

9.2.9

Special Character Registers –

Async and Programmable Sync Modes136

9.2.10 Special Character Range – Async Mode Only ..................................... 138

9.2.11 LNext Character (LNXT) – Async Mode Only ...................................... 139

9.2.12 Receive Frame Address Registers – HDLC Sync Mode Only ............. 139

9.2.13 CRC Polynomial Select Register (CPSR) ............................................ 141

9.2.14 Transmit Special Mapped Characters – PPP Mode only ..................... 141

9.2.15 Transmit Async Control Character Maps –

Async-HDLC/PPP Mode Only142

9.2.16 Receive Async Control Character Maps –

Async-HDLC/PPP Mode Only143

9.3

Bit Rate and Clock Option Registers................................................................. 145

9.3.1

Receive Baud Rate Generator Registers ............................................. 145

9.3.2

Transmit Baud Rate Generator Registers ............................................ 146

9.4

Channel Command and Status Registers ......................................................... 148

9.4.1

Channel Command Register (CCR) ..................................................... 148

CD2481 Datasheet(PDF) 5 Page - Intel Corporation

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