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MT312C 参数 Datasheet PDF下载

MT312C图片预览
型号: MT312C
PDF下载: 下载PDF文件 查看货源
内容描述: 卫星频道解码器 [Satellite Channel Decoder]
分类和应用: 解码器
文件页数/大小: 90 页 / 315 K
品牌: ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
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MT312 Secondary Registers for Test and De-Bugging  
10.2.28 Sweep PAR. Register 78 (R/W)  
Def  
hex  
NAME  
ADR  
B7  
B6  
B5  
B4  
B3  
B2  
B1  
B0  
SWEEP PAR  
78  
SW LIM  
SC [1:0]  
TS NR SWEEP[2:0]  
CS NR SWEE{[2:0]  
R/W  
49  
B7-6:  
SW LIM SC[1:0]  
Frequency sweep limit scale.  
B5-3:  
B2-0:  
TS NR SWEEP[2:0]  
CS NR SWEEP[2:0]  
10.2.29 Start up Time. Register 79 (R/W)  
Def  
hex  
NAME  
ADR  
B7  
B6  
B5  
B4  
B3  
B2  
B1  
B0  
STARTUP TIME  
79  
STARTUP INTERVAL[7:0]  
R/W  
30  
STARTUP INTERVAL[7:0]  
10.2.30 Loss Lock Threshold. Register 80 (R/W)  
Def  
hex  
NAME  
ADR  
B7  
B6  
B5  
B4  
B3  
B2  
B1  
B0  
LOSSLOCK TH  
80  
LOSSLOCK TH SPUR[3:0]  
LOSSLOCK TH SW[3:0]  
R/W  
21  
B7-4:  
B3-0:  
LOSSLOCK TH SPUR[3:0]  
LOSSLOCK TH SW[3:0]  
10.2.31 FEC Lock Time. Register 81 (R/W)  
FEC LOCK TM (81).  
Default value  
32 dec.  
20 hex.  
FEC LOCK TM[7:0]  
The number of symbol periods which the QPSK allows for the FEC to lock after achieving carrier and timing  
synchronisation is given by :  
FEC LOCK TM * Search factor * 65536  
The parameter Search Factor is 1 if there is no code rate search and is 8 if there is a code rate search, i.e. the  
QPSK allows more time for the FEC to lock in the presence of a code rate search.  
If the FEC does not lock within the allotted number of symbol periods, then the QPSK resets the timing and  
carrier loops and resumes the search for a QPSK signal.  
68  
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