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PM6341-QI 参数 Datasheet PDF下载

PM6341-QI图片预览
型号: PM6341-QI
PDF下载: 下载PDF文件 查看货源
内容描述: E1成帧器/收发器 [E1 FRAMER/TRANSCEIVER]
分类和应用: PC
文件页数/大小: 272 页 / 902 K
品牌: PMC [ PMC-SIERRA, INC ]
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PM6341 E1XC  
DATA SHEET  
PMC-910419  
ISSUE 8  
E1 FRAMER/TRANSCEIVER  
Register 28H: FRMR International/National Bits  
Bit  
Type  
Function  
Default  
Bit 7  
Bit 6  
Bit 5  
Bit 4  
Bit 3  
Bit 2  
Bit 1  
Bit 0  
R
R
R
R
R
R
R
R
Si1  
Si0  
X
X
X
X
X
X
X
X
RAWRA  
Sn0  
Sn1  
Sn2  
Sn3  
Sn4  
Reading this register returns the current bit value of the International and  
National bits collected over 2 consecutive frames.The Si1 bit position  
corresponds to the value contained in the International bit position in the FAS  
frame; the Si0, RAWRA, and Sn[4:0] bit positions correspond to the values  
contained in the International, Remote Alarm Indication, and National bit  
positions in the NFAS frame.This register is updated after time slot 0 of every  
NFAS frame and the contents are valid for 2 frames (250µs).The contents of this  
register are latched during the read, however the individual bits should not be  
considered to constitute a byte value (i.e. the 5 national bits should not be  
considered as indicating 1 of 32 possible values since it is possible that the  
individual bits are not all from the same time instant due to the asynchronous  
nature of the microprocessor reads). If the bits are to be interpreted as binary  
values, care should be taken to ensure a coherent set of bit values by reading  
the register at least twice.  
The Si0, RAWRA and Sn0-Sn4 bits map to the TSO NFAS as follows:  
Bit Position  
1
2
3
4
5
6
7
8
RAWRA  
Si0  
1
Sn0  
Sn1  
Sn2  
Sn3  
Sn4  
Note that the TXSAEN[8:4] bits in the E1XC Transmit Framing Options Register  
(Register 06H) can cause a datalink to overwrite some or all of the National Use  
Bits.  
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE  
133  
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