XRT94L33_2 Datasheet, PDF (607/810 Pages) Exar Corporation – 3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER - SDH REGISTERS

Rev222...000...000
XRT94L33
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Table 432: Transmit TUG-3/AU-3 Mapper VC-3 Path – Transmit Path Control Register (Address
Location= 0xN9B7, where N ranges in value from 0x02 to 0x04)
BIT 7
BIT 6
Unused
R/O
R/O
0
0
BIT 5
Pointer
Force
R/W
0
BIT 4
Check Stuff
R/W
0
BIT 3
Insert
Negative
Stuff
W
0
BIT 2
Insert
Positive Stuff
W
0
BIT 1
Insert
Continuous
NDF Events
R/W
0
BIT 0
Insert
Single NDF
Event
R/W
0
BIT NUMBER
7-6
5
NAME
Unused
Pointer Force
4
Check Stuff
3
Insert Negative
Stuff
TYPE
R/O
DESCRIPTION
R/W Pointer Force:
This READ/WRITE bit-field permits the user to load the values contained
within the “Transmit TUG-3/AU-3 Mapper VC-3 POH Arbitrary H1 Pointer”
and “Transmit TUG-3/AU-3 Mapper VC-3 POH Arbitrary H2 Pointer”
registers (Address Location= 0xN9BF and 0xN9C3) into the H1 and H2
bytes (within the outbound STM-0 data stream).
Note: The actual location of the SPE will NOT be adjusted, per the value
of H1 and H2 bytes. Hence, this feature should cause the remote
terminal to declare an “Invalid Pointer” condition.
0 – Configures the Transmit TUG-3/AU-3 Mapper VC-3 POH and Transmit
STM-1 SOH Processor blocks to transmit STM-0/STM-1 data with normal
and correct H1 and H2 bytes.
1 – Configures the Transmit TUG-3/AU-3 Mapper VC-3 POH and Transmit
STM-1 SOH Processor blocks to overwrite the values of the H1 and H2
bytes (in the outbound STM-0/STM-1 data-stream) with the values in the
“Transmit TUG-3/AU-3 Mapper VC-3 POH Arbitrary H1 and H2 Pointer”
registers.
R/W Check Stuff Monitoring:
This READ/WRITE bit-field permits the user to configure the Transmit TUG-
3/AU-3 Mapper VC-3 POH and Transmit STM-1 SOH Processor blocks to
only execute a “Positive”, “Negative” or “NDF” event (via the “Insert Positive
Stuff”, “Insert Negative Stuff”, “Insert Continuous or Single NDF” options, via
software command) if no pointer adjustment (NDF or otherwise) has
occurred during the last 3 SONET frame periods.
0 – Disables this feature.
In this mode, the Transmit TUG-3/AU-3 Mapper VC-3 POH and Transmit
STM-1 SOH Processor blocks will execute a “software-commanded” pointer
adjustment event, independent of whether a pointer adjustment event has
occurred in the last 3 SONET frame periods.
1 – Enables this feature.
In this mode, the Transmit TUG-3/AU-3 Mapper VC-3 POH and Transmit
STM-1 SOH Processor blocks will ONLY execute a “software-commanded”
pointer adjustment event, if no pointer adjustment event has occurred during
the last 3 SONET frame periods.
R/W Insert Negative Stuff:
This READ/WRITE bit-field permits the user to configure the Transmit TUG-
3/AU-3 Mapper VC-3 POH and Transmit STM-1 SOH Processor blocks to
insert a negative-stuff into the outbound STM-0/STM-1 data stream. This
command, in-turn will cause a “Pointer Decrementing” event at the remote
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