BT8370KPF

Manufacturer Part NumberBT8370KPF
DescriptionFully integrated T1/E1 framer and line interface
ManufacturerConexant Systems, Inc.
BT8370KPF datasheet
 


Specifications of BT8370KPF

CaseQFP  
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
Page 71
72
Page 72
73
Page 73
74
Page 74
75
Page 75
76
Page 76
77
Page 77
78
Page 78
79
Page 79
80
Page 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
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
Page 80/323:

Embedded Framing

Download datasheet (3Mb)Embed
PrevNext
2.0 Circuit Description
2.7 Transmit System Bus
For applications that frame in both directions, the processor can manually
arbitrate among pending reframe requests by controlling the reframe precedence.
An example of manual control follows:
The status of the offline framer can be monitored using the Offline Framer
Status register [FSTAT; addr 017]. The register reports the following:
• whether the offline framer is looking at the receive or transmit data streams
• whether the framer is actively searching for frame alignment (ACTIVE)
• whether the framer found multiple framing candidates (TIMEOUT)
• whether the framer found frame sync (FOUND)
• whether the framer found no frame alignment candidates (INVALID)
2.7.5 Embedded Framing
Embedded framing mode [EMBED; addr 0D0] instructs the transmit framer to
search TSLIP buffer output (TNRZ) for framing bits while in T1 mode, or for
MFAS and CAS in E1 mode. Embedded framing allows the transmit timebase to
align with the transmit framer multiframe alignment of the PCM signal
transported across the system bus.
The G.802 Embedded mode supports ITU-T Recommendation G.802, which
describes how 24 T1 time slots and framing bit (193 bits) are mapped to the 32 E1
time slots (256 bits): by leaving TS0 and TS16 unassigned, by storing the 24 T1
time slots in TS1 to TS15, and in TS17 to TS25, and by storing the frame bit in
Bit 1 of TS26 (see
2-52
Fully Integrated T1/E1 Framer and Line Interface
1
Initialize RABORT = 1 and TABORT = 1.
2
Enable RLOF and TLOF interrupts.
3
Read clear pending ISR interrupts.
4
Release RABORT = 0.
5
Call LOF Service Routine if either RLOF or TLOF interrupt;
{
(check current LOF status (ALMI, 2; addr 047, 048)
If RLOF recovered and TLOF lost
—Assert RABORT = 1
—Release TABORT = 0
If RLOF lost or TLOF recovered
—Assert TABORT = 1
—Release RABORT = 0
}
(RX/TXN)
Figure
2-20).
Conexant
Bt8370/8375/8376
N8370DSE