CD2231

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


1
2
3
4
5
6
7
8
9
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
Page 81
82
Page 82
83
Page 83
84
Page 84
85
Page 85
86
Page 86
87
Page 87
88
Page 88
89
Page 89
90
Page 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 89/178

Download datasheet (3Mb)Embed
PrevNext
Intelligent Two-Channel LAN and WAN Communications Controller — CD2231
8.2
Option Registers
8.2.1
Channel Mode Register (CMR)
Register Name: CMR
Register Description: Channel Mode
Default Value: x’02
Access: Byte Read/Write
Bit 7
Bit 6
Bit 5
RxMode
TxMode
0
Bit 7
Receive Transfer mode
0 – Interrupt
1 – DMA
Bit 6
Transmit Transfer mode
0 – Interrupt
1 – DMA
Bits 5:3
Reserved – must be ‘0’.
Bits 2:0
Protocol mode select
If these options are changed, an initialize command must be given to the CD2231
through the Channel Command register.
Datasheet
C0
Channel number
0
Channel 0
1
Channel 1
Bit 4
Bit 3
0
0
chmd2
chmd1
0
0
0
0
0
1
0
1
1
0
1
0
1
1
1
1
Intel Hex Address: x’18
Motorola Hex Address: x’1B
Bit 2
Bit 1
Bit 0
chmd2
chmd1
chmd0
chmd0
0
HDLC
1
Reserved
0
Async
1
Reserved
0
Async–HDLC/PPP
1
SLIP
0
MNP4/ARAP
1
Reserved
89