参数资料
型号: DS21Q58LN
英文描述: E1 Quad Transceiver
中文描述: 素E1通道收发器
文件页数: 54/74页
文件大小: 647K
代理商: DS21Q58LN
DS21Q58 E1 Quad Transceiver
54 of 74
Transmit and receive CMI is enabled through OUTAC.7. When this register bit is set, the TTIP pin outputs 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 can also use HDB3 coding.
When this register bit is set, the RTIP pin becomes a unipolar CMI input. The CMI signal is processed to extract
and align the clock with data. The bipolar code-violation counter counts CVs in the CMI signal. CVs are defined as
consecutive ones of the same polarity, as shown in
Figure 22-2
. If HDB3 precoding is enabled, the CVs generated
by HDB3 are not counted as errors.
Figure 22-2. Example of CMI Code Violation
0
1
1
1
0
0
1
CLOCK
DATA
CMI
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