ds26524 Maxim Integrated Products, Inc., ds26524 Datasheet - Page 133
ds26524
Manufacturer Part Number
ds26524
Description
Ds26524 Quad T1/e1/j1 Transceiver
Manufacturer
Maxim Integrated Products, Inc.
Datasheet
1.DS26524.pdf
(273 pages)
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Register Name:
Register Description:
Register Address:
Bit #
Name
Default
Note: This register has an alternate definition for E1 mode. See E1RRTS7.
Bit 7: Receive FDL Bit 7 (RFDL7). MSB of the received FDL code.
Bit 6: Receive FDL Bit 6 (RFDL6).
Bit 5: Receive FDL Bit 5 (RFDL5).
Bit 4: Receive FDL Bit 4 (RFDL4).
Bit 3: Receive FDL Bit 3 (RFDL3).
Bit 2: Receive FDL Bit 2 (RFDL2).
Bit 1: Receive FDL Bit 1 (RFDL1).
Bit 0: Receive FDL Bit 0 (RFDL0). LSB of the received FDL code.
Register Name:
Register Description:
Register Address:
Bit #
Name
Default
Note: This register has an alternate definition for T1 mode. See T1RFDL. All bits in this register are real-time (not latched).
Bits 7 to 3: CRC-4 Sync Counter Bits (CSC[5:2] and CSC0). The CRC-4 sync counter increments each time the
8ms CRC-4 multiframe search times out. The counter is cleared when the framer has successfully obtained
synchronization at the CRC-4 level. The counter can also be cleared by disabling the CRC-4 mode (RCR1.3 = 0).
This counter is useful for determining the amount of time the framer has been searching for synchronization at the
CRC-4 level. ITU-T G.706 suggests that if synchronization at the CRC-4 level cannot be obtained within 400ms,
then the search should be abandoned and proper action taken. The CRC-4 sync counter will saturate (not rollover).
CSC0 is the LSB of the 6-bit counter. (CSC1 is omitted to allow resolution to > 400ms using 5 bits.)
Bit 2: CRC-4 MF Sync Active (CRC4SA). Set while the synchronizer is searching for the CRC-4 MF alignment
word.
Bit 1: CAS MF Sync Active (CASSA). Set while the synchronizer is searching for the CAS MF alignment word.
Bit 0: FAS Sync Active (FASSA). Set while the synchronizer is searching for alignment at the FAS level.
RFDL7
CSC5
7
0
7
0
T1RFDL (T1 Mode)
Receive FDL Register
062h + (200h x n): where n = 0 to 3, for Ports 1 to 4
E1RRTS7 (E1 Mode)
Receive Real-Time Status Register 7
062h + (200h x n): where n = 0 to 3, for Ports 1 to 4
RFDL6
CSC4
6
0
6
0
RFDL5
CSC3
5
0
5
0
133 of 273
RFDL4
CSC2
4
0
4
0
RFDL3
CSC0
3
0
3
0
CRC4SA
RFDL2
2
0
2
0
CASSA
RFDL1
1
0
1
0
FASSA
RFDL0
0
0
0
0
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