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PM4328-PI 参数 Datasheet PDF下载

PM4328-PI图片预览
型号: PM4328-PI
PDF下载: 下载PDF文件 查看货源
内容描述: 高密度T1 / E1成帧器,集成M13多路复用器 [HIGH DENSITY T1/E1 FRAMER WITH INTEGRATED M13 MULTIPLEXER]
分类和应用: 复用器数字传输控制器电信集成电路电信电路异步传输模式ATM
文件页数/大小: 250 页 / 1399 K
品牌: PMC [ PMC-SIERRA, INC ]
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STANDARD PRODUCT  
PM4328 TECT3  
DATASHEET  
PMC-2011596  
ISSUE 1  
HIGH DENSITY T1/E1 FRAMER  
AND M13 MULTIPLEXER  
Figure 41: PRGD Pattern Generator  
LENGTH  
PS  
TAP  
1
2
3
32  
The pattern generator consists of a 32 bit shift register and a single XOR gate.  
The XOR gate output is fed into the first stage of the shift register. The XOR  
gate inputs are determined by values written to the length register (PL[4:0]) and  
the tap register (PT[4:0], when the PS bit is low). When PS is high, the pattern  
detector functions as a recirculating shift register, with length determined by  
PL[4:0].  
Generating and detecting repetitive patterns  
When a repetitive pattern (such as 1-in-8) is to be generated or detected, the PS  
bit must be set to logic 1. The pattern length register must be set to (N-1), where  
N is the length of the desired repetitive pattern. Several examples of  
programming for common repetitive sequences are given below in the Common  
Test Patterns section.  
For pattern generation, the desired pattern must be written into the PRGD  
Pattern Insertion registers. The repetitive pattern will then be continuously  
generated. The generated pattern will be inserted in the output data stream, but  
the phase of the pattern cannot be guaranteed.  
For pattern detection, the PRGD will determine if a repetitive pattern of the length  
specified in the pattern length register exists in the input stream. It does so by  
loading the first N bits from the data stream, and then monitoring to see if the  
pattern loaded repeats itself error free for the subsequent 48 bit periods. It will  
repeat this process until it finds a repetitive pattern of length N, at which point it  
begins counting errors (and possibly re-synchronizing) in the same way as for  
pseudo-random sequences. Note that the PRGD does NOT look for the pattern  
loaded into the Pattern Insertion registers, but rather automatically detects any  
repetitive pattern of the specified length. The precise pattern detected can be  
determined by initiating a PRGD update, setting PDR[1:0] = 00 in the PRGD  
Control register, and reading the Pattern Detector registers (which will then  
contain the 32 bits detected immediately prior to the strobe).  
PROPRIETARY AND CONFIDENTIAL  
171  
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