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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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CX28331/CX28332/CX28333  
2.0 Functional Description  
Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit  
2.2 Transmitter  
2.2 Transmitter  
This section describes the detailed operation of the various blocks in the CX2833i  
transmitter.  
2.2.1 AMI B3ZS/HDB3 Encoder  
ENDECDIS and the E3MODE pins configure the encoder mode.  
When ENDECDIS = 0, the encoder is receiving non-encoded Nonreturn to  
Zero (NRZ) data on the TNRZ (TPOS) pin alone, and the NC (no connect)  
(TNEG) pin is ignored.  
Data is encoded into a representation of a three-level B3ZS (E3MODE = 0) or  
HDB3 (E3MODE = 1) signal (conforming to the coding rules as specified in  
Appendix A) before going on to the pulse shaper in the form of two binary signals  
representing the positive and negative three-level pulses.  
When ENDECDIS = 1, the encoder is disabled. The encoder passes  
already-encoded data over TPOS (TNRZ) and TNEG (NC) to the pulse shaper.  
The transmit digital data is clocked into the chip via a rising TCLK edge,  
which must be equal to the symbol rate (line rate). A small delay added to the data  
provides a certain amount of negative data hold time.  
2.2.2 Pulse Shaper  
The pulse shaper converts the two digital (clocked) positive and negative pulses  
into a single analog three-level Alternate Mark Inversion (AMI) pulse. The pulses  
are in Return to Zero (RZ) format, meaning that all positive and negative pulses  
have a duration of the first half of the symbol period.  
For the E3 rate (E3MODE = 1), the AMI pulse is a full-amplitude,  
square-shaped pulse with very little slope.  
Figure 2-2. Pulse Shaper  
E3  
Mode  
+ Pulse  
– Pulse  
LBO  
LBO = 0  
Pulse  
Shaper  
Line Driver  
LBO = 1  
100604_008  
100985A  
Conexant  
2-3  
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