參數(shù)資料
型號(hào)： DS21Q50N
英文描述： Telecommunication IC
中文描述： 通信集成電路
文件頁(yè)數(shù)： 43/99頁(yè)
文件大?。?/td> 325K
代理商： DS21Q50N
DS21Q50
Page 43 of 99
9. ERROR COUNT REGISTERS
There are a set of four counters in each transceiver of the DS21Q50 that record bipolar or code violations,
errors in the CRC4 SMF code words, E bits as reported by the far end, and word errors in the FAS. The E-Bit
counter is re-configured for counting errors in the PRBS pattern if receive PRBS is enabled. Each of these four
counters are automatically updated on either one second boundaries (CCR2.7=0) or every 62.5 ms
(CCR2.7=1) as determined by the timer in Status Register 2 (SR2.4). Hence, these registers contain
performance data from either the previous second or the previous 62.5 ms. The user can use the interrupt from
the one second timer to determine when to read these registers. The user has a full second (or 62.5 ms) to read
the counters before the data is lost. All four counters will saturate at their respective maximum counts and they
will not rollover.
9.1 BPV OR CODE VIOLATION COUNTER
Violation Count Register 1 (VCR1) is the most significant word and VCR2 is the least significant word of a 16–
bit counter that records either BiPolar Violations (BPVs) or Code Violations (CVs). If CCR2.6=0, then the
VCR counts bipolar violations. Bipolar violations are defined as consecutive marks of the same polarity. In this
mode, if the HDB3 mode is set for the receiver via CCR1.2, then HDB3 code words are not counted as BPVs.
If CCR2.6=1, then the VCR counts code violations as defined in ITU O.161. Code violations are defined as
consecutive bipolar violations of the same polarity. In most applications, the framer should be programmed to
count BPVs when receiving AMI code and to count CVs when receiving HDB3 code. This counter increments
at all times and is not disabled by loss of sync conditions. The counter saturates at 65,535 and will not rollover.
The bit error rate on an E1 line would have to be greater than 10
–2
before the VCR would saturate.
Register Name:
VCR1, VCR2
Register Description:
BIPOLAR VIOLATION COUNT REGISTERS
Register Address:
00 Hex, 01 Hex
Bit #
7
6
5
4
SYM
V15
V14
V13
V12
V11
SYM
V7
V6
V5
V4
V3
SYMBOL
BIT
V15
VCR1.7
MSB of the 16–bit code violation count
V0
VCR2.0
LSB of the 16–bit code violation count
3
2
1
V9
V1
0
V8
V0
V10
V2
NAME AND DESCRIPTION
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