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): 75/99頁(yè)
文件大小: 325K
代理商: DS21Q50N
DS21Q50
Page 75 of 99
Figure 20-1
CMI CODING
Transmit and Receive CMI is enabled via OUTAC.7. When this register bit is set, the TTIP pin will output CMI
coded data at normal TTL type levels. This signal can be used to directly drive an optical interface. When CMI
is enabled, the user may also use HDB3 coding.
When this register bit is set, the RTIP pin will become a unipolar CMI input. The CMI signal will be processed
to extract and align the clock with data. The BiPolar code violation counter will count CVs (Code Violations) in
the CMI signal. CVs are defined as consecutive ones of the same polarity as shown in Figure 20-2. If HDB3
pre-coding is enabled then the CVs generated by HDB3 will not be counted as errors.
Figure 20-2 EXAMPLE OF CMI CODE VIOLATION (CV)
0
1
1
1
0
0
1
CLOCK
DATA
CMI
0
1
1
1
0
0
1
CLOCK
DATA
CMI
CODE VIOLATION
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