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
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
Page 101
102
Page 102
103
Page 103
104
Page 104
105
Page 105
106
Page 106
107
Page 107
108
Page 108
109
Page 109
110
Page 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 103/178

Download datasheet (3Mb)Embed
PrevNext
Intelligent Two-Channel LAN and WAN Communications Controller — CD2231
SCHR1 = XON
SCHR2 = XOFF
In addition to the SCDE and TxIBE bits, if the FCT bit (COR3) is set when flow control characters
are received, they are stripped from the data stream.
MNP 4 Mode
SCHR1 holds the start character.
SCHR1 holds the escape character
MNP 4/ARAP 1.0
SCHR1
SYN 16 hex
SCHR2
DLE 10 hex
8.2.9.3
Special Character Register 3 (SCHR3)
Register Name: SCHR3
Register Description: Special Character Register 3
Default Value: x’00
Access: Byte Read/Write
Bit 7
Bit 6
Bit 5
8.2.9.4
Special Character Register 4 (SCHR4)
Register Name: SCHR4
Register Description: Special Character Register 4
Default Value: x’00
Access: Byte Read/Write
Bit 7
Bit 6
Bit 5
Special characters 3 and 4 are used in conjunction with the ESCDE bit of COR3 to detect
characters in the receive data stream and to generate receive special character interrupts.
Note: Special characters 3 and 4 are not stripped from the data stream if Flow Control Transparency
(FCT) mode is enabled.
Datasheet
ARAP 2.0
SOH 01 hex
ESC 1B hex
Bit 4
Bit 3
Bit 2
User-defined special character
Bit 4
Bit 3
Bit 2
User-defined special character
Intel Hex Address: x’1E
Motorola Hex Address: x’1D
Bit 1
Bit 0
Intel Hex Address: x’1F
Motorola Hex Address: x’1C
Bit 1
Bit 0
103