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
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
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
Page 211
212
Page 212
213
Page 213
214
Page 214
215
Page 215
216
Page 216
217
Page 217
218
Page 218
219
Page 219
220
Page 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 217/323

Download datasheet (3Mb)Embed
PrevNext
Bt8370/8375/8376
Fully Integrated T1/E1 Framer and Line Interface
Transmit CR Message Bit—The processor writes the selected C/R bit value to send in each PRM.
PRM_CR
Transmit R Message Bit—The processor writes the selected R bit value to send in each PRM.
PRM_R
Transmit U1 Message Bit—The processor writes the selected U1 bit value to send in each PRM.
PRM_U1
Transmit U2 Message Bit—The processor writes the selected U2 bit value to send in each PRM.
PRM_U2
Transmit SL Message Bit—The processor writes the selected SL bit value to send in each PRM.
PRM_SL
Automatic SL Bit Insertion—RFSLIP error status is encoded into the transmit PRM contents,
AUTO_SL
or the PRM_SL bit value supplied by the processor is sent.
Immediately Generate and Send PRM—Similar to AUTO_PRM mode, SEND_PRM instructs
SEND_PRM
the data link transmitter to format and send a Performance Report Message according to ANSI
T1.403-1995. SEND_PRM executes immediately rather than waiting for an ONESEC
interrupt. Thus, SEND_PRM gives processor control over PRM transmit timing. This is easier
for the processor to manage if other FDL message types must also be transmitted.
0AB— TDL #1 FIFO Empty Control (TDL1_FEC)
7
6
5
FEC[5]
Near Empty Transmit FIFO Threshold—Selects FIFO depth of near empty interrupt [TNEAR;
FEC[5:0]
addr 009] and near empty level status [TNEAR1; addr 0AE]. The TNEAR interrupt is
activated when the number of data bytes remaining to be transmitted from the FIFO falls below
the selected threshold. The TNEAR1 indicator is active as long as the number of
processor-filled FIFO locations is below the selected threshold. Thus, TNEAR1 is active-high
when the transmit FIFO is empty, and remains active until the processor writes the selected
threshold number of bytes to TDL1 [addr 0AD]. Assuming the processor writes 64 bytes to fill
an empty FIFO, a TNEAR interrupt occurs after the transmitter has sent the number of bytes
required to bring the FIFO level back down below the selected threshold. Hence, the processor
can consecutively write 64 - FEC[5:0] number of bytes to the transmit FIFO in response to a
TNEAR interrupt. The interrupt also signifies time remaining (in bytes) for the processor to
write TDL1 before transmit FIFO is emptied. Typically, FEC[5:0] is set to a small value
(below 10-byte threshold) to minimize the number of TNEAR interrupts and maximize the
time between TNEAR interrupts.
FEC[5:0]
00 0000
00 0001
00 0010
11 1110
11 1111
N8370DSE
0 = send PRM_SL value in SL bit
1 = send RFSLIP error status in SL bit
4
3
FEC[4]
FEC[3]
Byte threshold @ TNEAR
disabled
1 byte threshold
2 byte threshold
|
|
62 byte threshold
63 byte threshold
Conexant
3.16 Data Link Registers
2
1
0
FEC[2]
FEC[1]
FEC[0]
Empty @ TNEAR
disabled
63 empty
62 empty
|
2 empty
1 empty
3-99