CD2231

Manufacturer Part NumberCD2231
DescriptionCD2231 Intelligent Two-channel Lan And Wan Communications Controller
ManufacturerIntel Corporation
CD2231 datasheet
 


1
Page 1
2
Page 2
3
Page 3
4
Page 4
5
Page 5
6
Page 6
7
Page 7
8
Page 8
9
Page 9
10
Page 10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
Page 5/178

Download datasheet (3Mb)Embed
PrevNext
Intelligent Two-Channel LAN and WAN Communications Controller — CD2231
7.5
Transmit Interrupt Service Routine......................................................................87
8.0
Detailed Register Descriptions
8.1
Global Registers..................................................................................................88
8.1.1
Global Firmware Revision Code Register (GFRCR) ..............................88
8.1.2
Channel Access Register (CAR) ............................................................88
8.2
Option Registers..................................................................................................89
8.2.1
Channel Mode Register (CMR) ..............................................................89
8.2.2
Channel Option Register 1 (COR1)........................................................90
8.2.3
Channel Option Register 2 (COR2)........................................................92
8.2.4
Channel Option Register 3 (COR3) — Async-HDLC/PPP Mode ...........94
8.2.5
Channel Option Register 4 (COR4)........................................................98
8.2.6
Channel Option Register 5 (COR5)........................................................99
8.2.7
Channel Option Register 6 (COR6) — Async Mode Only ....................100
8.2.8
Channel Option Register 7 (COR7) — Async Mode Only ....................101
8.2.9
Special Character Registers — Async Modes Only .............................102
8.2.10 Special Character Range — Async Mode Only ...................................104
8.2.11 LNext Character (LNXT) — Async Mode Only.....................................104
8.2.12 Receive Frame Address Registers — HDLC Sync Mode Only ............105
8.2.13 CRC Polynomial Select Register (CPSR) ............................................106
8.2.14 Transmit Special Mapped Characters — PPP Mode only....................106
8.2.15 Transmit Async Control Character Maps — PPP Mode Only ..............107
8.2.16 Receive Async Control Character Maps — PPP Mode Only ...............108
8.3
Bit Rate and Clock Option Registers.................................................................110
8.3.1
Receive Baud Rate Generator Registers .............................................110
8.3.2
Transmit Baud Rate Generator Registers ............................................111
8.4
Channel Command and Status Registers .........................................................112
8.4.1
Channel Command Register (CCR) .....................................................112
8.4.2
Special Transmit Command Register (STCR) .....................................115
8.4.3
Channel Status Register (CSR) ...........................................................117
8.4.4
Modem Signal Value Registers (MSVR) ..............................................121
8.5
Interrupt Registers.............................................................................................122
8.5.1
General Interrupt Registers ..................................................................122
8.5.2
Receive Interrupt Registers..................................................................125
8.5.3
Transmit Interrupt Registers.................................................................133
8.5.4
Modem Interrupt Registers ...................................................................137
8.6
DMA Registers ..................................................................................................139
8.6.1
DMA Mode Register (DMR) .................................................................139
8.6.2
Bus Error Retry Count (BERCNT)........................................................140
8.6.3
DMA Buffer Status (DMABSTS) ...........................................................140
8.6.4
DMA Receive Registers .......................................................................141
8.6.5
DMA Transmit Registers ......................................................................145
8.7
Timer Registers .................................................................................................152
8.7.1
Timer Period Register (TPR)................................................................152
8.7.2
Receive Timeout Period Register (RTPR) — Async Mode Only..........153
8.7.3
General Timer 1 (GT1) Sync Modes Only............................................154
8.7.4
General Timer 2 (GT2) Sync Modes Only............................................154
8.7.5
Transmit Timer Register (TTR) Async Modes Only .............................155
Datasheet
...........................................................................88
5