欢迎访问ic37.com |
会员登录 免费注册
发布采购

PM5380-BI 参数 Datasheet PDF下载

PM5380-BI图片预览
型号: PM5380-BI
PDF下载: 下载PDF文件 查看货源
内容描述: [Micro Peripheral IC,]
分类和应用:
文件页数/大小: 440 页 / 2124 K
品牌: PMC [ PMC-SIERRA, INC ]
 浏览型号PM5380-BI的Datasheet PDF文件第81页浏览型号PM5380-BI的Datasheet PDF文件第82页浏览型号PM5380-BI的Datasheet PDF文件第83页浏览型号PM5380-BI的Datasheet PDF文件第84页浏览型号PM5380-BI的Datasheet PDF文件第86页浏览型号PM5380-BI的Datasheet PDF文件第87页浏览型号PM5380-BI的Datasheet PDF文件第88页浏览型号PM5380-BI的Datasheet PDF文件第89页  
S/UNI®-8x155 ASSP Telecom Standard Product Data Sheet  
Released  
Figure 9 CRC Generator  
g
1
g
2
gn-1  
Message  
D
0
D1  
D
n-1  
. . .  
+
+
+
+
MSB  
Parity Check Digits  
LSB  
An error insertion mechanism is provided for system diagnosis purposes. Error insertion is  
performed by inverting the resulting FCS value, before transmission. This should cause an FCS  
Error at the far end.  
10.13.3Byte Stuffing  
The POS Frame generator provides transparency by performing byte stuffing. This operation is  
done after the FCS calculation. Two characters are being escaped, the Flag Sequence (0x7E)  
and the Escape Character itself (0x7D). When a character is being escaped, it is XORed with  
0x20 before transmission and preceded by the Control Escape (0x7D) character.  
Table 4 HDLC Byte Sequences  
Data Value  
Sequence  
0x7D 0x5E  
0x7D 0x5D  
0x7D 0x7E  
0x7E (Flag Sequence)  
0x7D (Control Escape)  
HDLC Abort Sequence  
10.13.4Data Scrambling  
The Scrambler will optionally scramble the whole packet data, including the FCS and the flags.  
Scrambling is performed after the POS frame is formed using a parallel implementation of the  
43  
self-synchronous scrambler polynomial, x +1. On reset, the scrambler is set to all ones to  
ensure scrambling on start-up. The scrambler may optionally be completely disabled. Data  
scrambling can provide for a more robust system preventing the injection of hostile patterns into  
the data stream.  
10.13.5SONET/SDH Framer  
The SONET/SDH Framer gaps the POS frames in order to insert the SONET/SDH framing and  
overhead bytes (Section/Line Overhead and Path Overhead). The framer uses framing  
alignment information provided by the TPOP TSB to perform its function. The TXFP does not  
set any SONET/SDH overhead bytes.  
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.  
Document No.: PMC- 2010299, Issue 2  
85  
 复制成功!