参数资料
型号: DS26503
厂商: Maxim Integrated Products, Inc.
英文描述: T1/E1/J1/64KCC BITS Element
中文描述: T1/E1/J1 BITS单元
文件页数: 48/123页
文件大小: 995K
代理商: DS26503
DS26503 T1/E1/J1 BITS Element
48 of 123
9.2 E1 Information Registers
Register Name:
Register Description:
Register Address:
Bit #
7
Name
Default
0
HW
Mode
Bit 0/CAS Resync Criteria Met Event (CASRC).
Set when two consecutive CAS MF alignment words are received in error.
Bit 1/FAS Resync Criteria Met Event (FASRC.
Set when three consecutive FAS words are received in error.
Bit 2/CRC Resync Criteria Met Event (CRCRC).
Set when 915/1000 codewords are received in error.
Bit 3/Unused.
Bit 4/Unused.
Bit 5/Unused.
Bit 6/Unused.
Bit 7/Unused.
Register Name:
INFO3
Register Description:
Information Register 3 (Real Time)
Register Address:
1Ch
Bit #
7
6
5
4
Name
CSC5
CSC4
CSC3
CSC2
CSC0
Default
0
0
0
0
HW
Mode
Bit 0/CRC4 MF Sync Active (CRC4SA).
Set while the synchronizer is searching for the CRC4 MF alignment word.
Bit 1/CAS MF Sync Active (CASSA).
Set while the synchronizer is searching for the CAS MF alignment word.
Bit 2/FAS Sync Active (FASSA).
Set while the synchronizer is searching for alignment at the FAS level.
Bit 3-7/CRC4 Sync Counter Bits (CSC0 and CSC2 to CSC4).
The CRC4 sync counter increments each time the 8ms-CRC4
multiframe search times out. The counter is cleared when the framer has successfully obtained synchronization at the CRC4
level. The counter can also be cleared by disabling the CRC4 mode (E1RCR.3 = 0). This counter is useful for determining the
amount of time the framer has been searching for synchronization at the CRC4 level. ITU G.706 suggests that if
synchronization at the CRC4 level cannot be obtained within 400ms, then the search should be abandoned and proper action
taken. The CRC4 sync counter will rollover. CSC0 is the LSB of the 6-bit counter. (
Note:
The second LSB, CSC1, is not
accessible. CSC1 is omitted to allow resolution to >400ms using 5 bits.)
INFO2
Information Register 2
12h
6
0
5
0
4
0
3
0
2
1
0
CRCRC
0
FASRC
0
CASRC
0
X
X
X
X
X
X
X
X
3
2
1
0
FASSA
0
CASSA
0
CRC4SA
0
0
X
X
X
X
X
X
X
X
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