XRT94L33_3 Datasheet, PDF (283/801 Pages) Exar Corporation – -CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER - SONET REGISTERS

Rev222...000...000
XRT94L33
333---CCCHHHAAANNNNNNEEELLL DDDSSS333///EEE333///SSSTTTSSS---111 TTTOOO SSSTTTSSS---333///SSSTTTMMM---111 MMMAAAPPPPPPEEERRR ––– SSSOOONNNEEETTT RRREEEGGGIIISSSTTTEEERRRSSS
Table 182: Redundant Receive STS-3 Transport – In-Sync Threshold Value (Address
Location=0x172B)
BIT 7
R/O
0
BIT 6
Unused
R/O
0
BIT 5
R/O
0
BIT 4
BIT 3
FRPATOUT[1:0]
R/W
R/W
0
0
BIT 2
BIT 1
FRPATIN[1:0]
R/W
R/W
0
0
BIT 0
Unused
R/O
0
BIT NUMBER
7–5
NAME
Unused
TYPE
R/O
DESCRIPTION
4–3
FRPATOUT[1:0] R/W Framing Pattern – SEF Declaration Criteria:
These two READ/WRITE bit-fields permit the user to define the SEF Defect
Declaration criteria for the Redundant Receive STS-3 TOH Processor block.
The relationship between the state of these bit-fields and the corresponding
SEF Defect Declaration Criteria are presented below.
FRPATOUT[1:0]
SEF Defect Declaration Criteria
00
The Redundant Receive STS-3 TOH Processor
01
block will declare the SEF defect condition if either
of the following conditions are true for four
consecutive SONET frame periods.
• If the last (of the 3) A1 bytes, in the STS-3 data
stream is erred, or
• If the first (of the 3) A2 bytes, in the STS-3 data
stream, is erred.
Hence, for this selection, a total of 16 bits are
evaluated for SEF defect declaration.
10
The Redundant Receive STS-3 TOH Processor
block will declare the SEF defect condition if either
of the following conditions are true for four
consecutive SONET frame periods.
• If the last two (of the 3) A1 bytes, in the STS-3
data stream, are erred, or
• If the first two (of the 3) A2 bytes, in the STS-3
data stream, are erred.
Hence, for this selection, a total of 32 bits are
evaluated for SEF defect declaration.
11
The Redundant Receive STS-3 TOH Processor
block will declare the SEF defect condition if either
of the following conditions are true for four
consecutive SONET frame periods.
• If the last three (of the 3) A1 bytes, in the STS-
3 data stream, are erred, or
• If the first three (of the 3) A2 bytes, in the STS-
3 data stream, are erred.
Hence, for this selection, a total of 48 bits are
evaluated for SEF defect declaration.
2-1
FRPATIN[1:0] R/W Framing Pattern – SEF Defect Clearance Criteria:
283