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CX28333-1X 参数 Datasheet PDF下载

CX28333-1X图片预览
型号: CX28333-1X
PDF下载: 下载PDF文件 查看货源
内容描述: 单/双/三E3 / DS3 / STS - 1线路接口单元 [Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit]
分类和应用: 电信集成电路PC
文件页数/大小: 68 页 / 549 K
品牌: CONEXANT [ CONEXANT SYSTEMS, INC ]
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2.0 Functional Description  
CX28331/CX28332/CX28333  
2.2 Transmitter  
Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit  
2.2.4 Alarm Indication Signal (AIS) Generator  
When TAIS is asserted, an AIS replaces the transmit data at TPOS and TNEG.  
The E3 type of AIS signal (all 1s) is supported. In three-level signal form, this is a  
continuously alternating positive and negative pulse stream, as if the transmit data  
were a continuous string of logical 1s. Figure 2-7 illustrates the AIS signal.  
The TAIS pin has the same data latency as the TX data pins and can be used to  
replace single symbols within a data stream. When the encoder is disabled  
(ENDECDIS = 1), the TAIS mode maintains the proper phase, based upon the  
polarity of the last 1 received.  
The AIS signal follows the same path as the TX data during remote or local  
loopback.  
Figure 2-7. AIS Signal  
POSITIVE  
PULSE  
NEGATIVE  
PULSE  
TLINEP  
(output voltage)  
TLINEN  
(output voltage)  
8333_009  
2.2.5 Transmit Monitor Block (CX2833i-3x Only)  
The transmit monitor inputs (TMONP and TMONM) are designed to monitor the  
line driver outputs (TLINEP and TLINEM/N) for pulses and to assert a Loss Of  
Signal (TLOS) indicator when no output pulse has been detected for 32 TCLK  
periods. After TLOS is asserted, it will not deassert until a pulse is again  
detected. The transmit monitor is an independent function in which TMONP and  
TMONM must be externally connected to TLINEP and TLINEM/N, respectively.  
A special pin (TMONTST) is available for testing board-level functionality  
downstream from the TLOS outputs. When TMONST is high it will assert all  
TLOS channel outputs. TLOS outputs are active high when the monitor inputs do  
not detect a signal.  
2-8  
Conexant  
100985A  
 
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