参数资料
型号: PM4314
厂商: PMC-SIERRA INC
元件分类: 数字传输电路
英文描述: QUAD T1/E1 LINE INTERFACE DEVICE
中文描述: DATACOM, PCM TRANSCEIVER, PQFP128
封装: 14 X 20 MM, PLASTIC, QFP-128
文件页数: 146/170页
文件大小: 823K
代理商: PM4314
PM4314 QDSX
DATA SHEET
PMC-950857
ISSUE 5
QUAD T1/E1 LINE INTERFACE DEVICE
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
134
to a logic 1 generates one line code violation and 3 bit errors by causing the
omission of the first line code violation pulse when a string of 8 consecutive
zeros occurs in the unipolar data stream UNIDAT. To generate another line code
violation, the LCVINS bit must be reset to logic 0 and then set to logic 1 again.
Figure 27
- HDB3 Line Code Violation Insertion
CLK
UNIDAT
TXTIP
TXRING
continuous zeros
0 0 0 V
1 0 0 V
1 0 0 V
1
CLK
UNIDAT
TXTIP
TXRING
continuous zeros
0 0 0 V
1 0 0 V
V
0 0 0
LCVINS = 1 causes omission
of bipolar pulse and violation
of same polarity as previous
violation.
1
The effect of setting the LCVINS bit of the Diagnostics register (005H, 045H,
085H, and 0C5H) is shown in the above diagrams. The signals CLK and UNIDAT
are not actual signals but are used as reference guidelines and TXTIP[X] and
TXRING[X] have been shown as square NRZ pulses for illustrative purposes.
CLK shows the reference 1x clock used to generate the TXTIP[X] and
TXRING[X] outputs. UNIDAT is the unipolar data stream that is HDB3 encoded
to generate the TXTIP[X] and TXRING[X] bipolar output streams. Setting
LCVINS to a logic 1 generates one line code violation by causing the a bipolar
violation pulse of the same polarity as the previous bipolar violation pulse when a
string of 4 consecutive zeros occurs in the unipolar data stream UNIDAT. To
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