CD2481 Datasheet, PDF (5/222 Pages) Intel Corporation – Programmable Four-Channel Communications Controller

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
Datasheet
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