參數資料
型號： 28233-11
廠商： CONEXANT SYSTEMS
元件分類： 數字傳輸電路
英文描述： ATM Transmitter/Receiver with UTOPIA Interface
中文描述： TRANSCEIVER, PQFP160
封裝： PLASTIC, MQFP-160
文件頁數： 65/161頁
文件大?。?/td> 1832K
代理商： 28233-11
1 0 1
CN8223
2.0 Functional Description
ATM Transmitter/Receiver with UTOPIA Interface
2.6 ATM Cell Processing
100046C
Conexant
2-31
If Disable Cell Receiver [bit 14] of CELL_VAL and Disable Port Reception
—
Port X [bits 7
–
4] 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.
Table 2-19. Status Octet Definition
Bit
Definition
0
HEC Error Corrected for Port 3
1
HEC Error Not-Corrected for Port 3
2
Payload Length Error for Port 3 (AAL3/4)
3
Payload CRC-10 Error for Port 3 (AAL3/4)
4
User Data Bit for Port 3 (AAL5 EOM)
5
Header Match Port 0
6
Header Match Port 1
7
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 0 1
1
0 1 0
0
0 1 1
1
1 0 0
0
0
1 1 0
0
1 1 1
0
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