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28222-13 参数 Datasheet PDF下载

28222-13图片预览
型号: 28222-13
PDF下载: 下载PDF文件 查看货源
内容描述: ATM发射器/接收器与UTOPIA接口 [ATM Transmitter/Receiver with UTOPIA Interface]
分类和应用: 异步传输模式ATM
文件页数/大小: 161 页 / 1722 K
品牌: CONEXANT [ CONEXANT SYSTEMS, INC ]
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CN8223  
2.0 Functional Description  
ATM Transmitter/Receiver with UTOPIA Interface  
2.6 ATM Cell Processing  
Table 2-19. Status Octet Definition  
Bit  
Definition  
HEC Error Corrected for Port 3  
0
1
2
3
4
5
6
7
HEC Error Not-Corrected for Port 3  
Payload Length Error for Port 3 (AAL3/4)  
Payload CRC-10 Error for Port 3 (AAL3/4)  
User Data Bit for Port 3 (AAL5 EOM)  
Header Match Port 0  
Header Match Port 1  
Header Match Port 2  
Table 2-20. PT Header Field and User Data Bit  
PT Header Field  
User Data Bit  
0 0 0  
0 0 1  
0 1 0  
0 1 1  
1 0 0  
1 0 1  
1 1 0  
1 1 1  
0
1
0
1
0
0
0
0
If Disable Cell Receiver [bit 14] of CELL_VAL and Disable Port Reception—  
Port X [bits 74] of CONFIG_4 [0x29] are not set, then enabled checks are made  
on each cell received in the following sequence:  
1. The HEC is checked for errors under control of the HEC Coverage [bit 1]  
of CONFIG_3 [0x03]. Correctable errors are corrected if Enable HEC  
Correction [bit 8] of CELL_VAL is set. The correction/detection state  
machine is implemented as defined in the ATM UNI/NNI specifications.  
Errors counted in either the COR_HEC_ERR counter [0x49] or  
UNCOR_HEC_ERR counter [0x4A] are also indicated in the  
corresponding bits in the EVENT_STATUS register [0x39]. HEC error  
correction/detection is performed independent of any header screening that  
is enabled. Error correction should be enabled only if HEC Coverage is 0  
and Enable HEC Coset [bit 0] of CONFIG_3 is 1.  
2. The payload CRC-10 is checked. Errors are counted in the  
PAY_CRC_ERR counter [0x48] and indicated in EVENT_STATUS. No  
CRC checking is performed on cells matching the idle header description.  
3. The payload length is checked to be consistent with the segment type.  
100046C  
Conexant  
2-31