DS21348 Dallas Semiconducotr, DS21348 Datasheet - Page 45

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DS21348

Manufacturer Part Number
DS21348
Description
3.3V E1/T1/J1 Line Interface
Manufacturer
Dallas Semiconducotr
Datasheet

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FUNCTION OF ECRS BITS AND RNEG PIN Table 8-4
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
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
8.5
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.
(CCR1.7)
E1 or T1
(MSB)
E15
E7
not be present at RNEG.
SYMBOL
X
0
0
0
0
1
1
1
1
E15
Error Insertion
E0
(CCR6.2)
ECRS2
E14
E6
0
0
0
0
0
0
0
0
1
POSITION
ECR1.7
ECR2.0
(CCR6.1)
E13
E5
ECRS1
X
X
X
X
X
0
0
1
1
E12
(CCR6.0)
E4
ECRS0
DESCRIPTION
MSB of the 16-bit error count
LSB of the 16-bit error count
X
0
1
0
1
0
1
0
1
E11
E3
(CCR2.3)
45 of 73
RHBE
X
X
X
X
X
0
0
1
1
E10
E2
CVs
BPVs (HDB3 code words not counted)
CVs + EXZs
BPVs + EXZs
BPVs (B8ZS code words not counted)
BPVs + 8 EXZs
BPVs
BPVs + 16 EXZs
PRBS Errors
FUNCTION OF ECR
COUNTERS/RNEG
E9
E1
2
(LSB)
E8
E0
1
ECR1
ECR2

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