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 79/323

Download datasheet (3Mb)Embed
PrevNext
Bt8370/8375/8376
Fully Integrated T1/E1 Framer and Line Interface
After the offline framer recovers frame alignment, the online framer monitors
TLOF and searches for multiframe alignment; the search uses the criteria defined
by the Transmit Frame mode [TFRAME; addr 070]. The online framer conducts a
multiframe alignment search each time the offline framer recovers transmit frame
alignment, as reported by high-to-low transition of transmit loss of frame status
[TLOF; addr 048]. After TLOF recovery, the online framer searches continuously
for multiframe alignment until the correct pattern sequence is located, or until
basic frame alignment is lost (TLOF goes active-high). After multiframe
alignment recovery, the online framer checks subsequent multiframes for errored
alignment patterns, but does not use those errors as part of the criteria for loss of
basic frame alignment.
NOTE:
The frame synchronization criteria used by the offline framer is set in the
TFRAME[3:0] of the Transmit Framer Configuration register [TCR0; addr 070].
(Tables 3-15
Tables 3-17
The offline framer is shared between the RCVR and XMTR and can only
search in 1 direction at a time. Consequently, the host processor can manually
arbitrate between RCVR and XMTR reframe requests by manipulating the
ABORT and FORCE controls, or by allowing the framer to automatically
arbitrate LOF requests.
The offline framer waits until the current search is complete [FSTAT;
addr 017] before checking for pending LOF reframe requests. If both online
framers have pending reframe requests, the offline framer aligns to the opposite
direction of that most recently searched. For example, if TLOF is pending at the
conclusion of a receive search which timed out without finding alignment, the
offline framer switches to search in the transmit direction. The TLOF switchover
is prevented in the preceding example if the processor asserts TABORT to mask
the transmit reframe request. TABORT does not affect TLOF status reporting. For
applications that frame in only 1 direction, framing in the opposite direction must
be masked. If, at the conclusion of a receive search timeout, TLOF status is
asserted but masked by TABORT, the offline framer continues to search in the
receive direction.
N8370DSE
The online framer's multiframe search status is not directly reported to the
processor, but instead is monitored by examination of transmit error status:
TMERR, TSERR, and TCERR [addr 00B]. If the system incorporates a
certain number of multiframe pattern errors (or a certain error ratio) into
the loss of transmit frame alignment criteria, the processor must count
multiframe pattern errors to determine when to force a transmit reframe
[TFORCE; addr 071].
and
3-16
illustrate supported transmit framing formats. Also, see
and 3-18, Criteria for Loss/Recovery of Transmit Frame Alignment.)
Conexant
2.0 Circuit Description
2.7 Transmit System Bus
2-51