DS21348

Manufacturer Part NumberDS21348
Description3.3V E1/T1/J1 Line Interface
ManufacturerDallas Semiconducotr
DS21348 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
Page 41
42
Page 42
43
Page 43
44
Page 44
45
Page 45
46
Page 46
47
Page 47
48
Page 48
49
Page 49
50
Page 50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
Page 45/73

Download datasheet (552Kb)Embed
PrevNext
FUNCTION OF ECRS BITS AND RNEG PIN Table 8-4
E1 or T1
ECRS2
ECRS1
(CCR1.7)
(CCR6.2)
(CCR6.1)
0
0
0
0
0
0
0
0
1
0
1
0
1
0
1
0
X
1
NOTES:
1. RNEG outputs error data only when in NRZ mode (CCR1.6 = 1)
2. PRBS errors will always be output at PBEO independent of ECR control bits and NRZ mode and will
not be present at RNEG.
8.4.1 Error Counter Update
A transition of the ECUE (CCR1.4) control bit from 0 to 1 will update the ECR registers with the current
values and reset the counters. ECUE must be set back to zero and another 0 to 1 transition must occur for
subsequent reads/resets of the ECR registers. Note that the DS21348 can report errors at RNEG when in
NRZ mode (CCR1.6 = 1) by outputting a pulse for each error occurrence. The counter saturates at 65,535
and will not rollover.
ECR1 (11H): UPPER ERROR COUNT REGISTER 1
ECR2 (12H): LOWER ERROR COUNT REGISTER 2
(MSB)
E15
E14
E13
E7
E6
E5
SYMBOL
POSITION
E15
ECR1.7
E0
ECR2.0
8.5
Error Insertion
When IBPV (CCR3.1) is transitioned from a zero to a one, the device waits for the next occurrence of
three consecutive ones to insert a BPV. IBPV must be cleared and set again for another BPV error
insertion. See for details on the insertion of the BPV into the datastream.
When IBE (CCR3.0) is transitioned from a zero to a one, the device will insert a logic error. IBE must be
cleared and set again for another logic error insertion. See for details on the insertion of the logic error
into the datasteam.
ECRS0
RHBE
(CCR6.0)
(CCR2.3)
0
0
X
0
1
X
1
0
X
1
1
X
X
0
0
X
1
0
X
0
1
X
1
1
X
X
X
E12
E11
E4
E3
DESCRIPTION
MSB of the 16-bit error count
LSB of the 16-bit error count
45 of 73
FUNCTION OF ECR
COUNTERS/RNEG
CVs
BPVs (HDB3 code words not counted)
CVs + EXZs
BPVs + EXZs
BPVs (B8ZS code words not counted)
BPVs + 8 EXZs
BPVs
BPVs + 16 EXZs
2
PRBS Errors
(LSB)
E10
E9
E8
E2
E1
E0
1
ECR1
ECR2