XRT94L33_07 Datasheet, PDF (852/862 Pages) Exar Corporation – 3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER - ATM REGISTERS

XRT94L33
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Rev222...000...000
POH and Transmit STS-3 TOH Processor blocks to insert a negative-stuff into
the outbound STS-3c/STS-3 data stream. This command, in-turn will cause a
“Pointer Decrementing” event at the remote terminal.
Writing a “0” to “1” transition into this bit-field causes the following to happen.
• A negative-stuff will occur (e.g., a single payload byte will be inserted into
the H3 byte position within the outbound STS-1/STS-3 data stream).
• The “D” bits, within the H1 and H2 bytes will be inverted (to denote a
“Decrementing” Pointer Adjustment event).
• The contents of the H1 and H2 bytes will be decremented by “1”, and will be
used as the new pointer from this point on.
Note: Once the user writes a “1” into this bit-field, the XRT94L33 will
automatically clear this bit-field. Hence, there is no need to
subsequently reset this bit-field to “0”.
2
Insert Positive R/W Insert Positive Stuff:
Stuff
This READ/WRITE bit-field permits the user to configure the Transmit STS-3c
POH and Transmit STS-3 TOH Processor blocks to insert a positive-stuff into
the outbound STS-3c/STS-3 data stream. This command, in-turn will cause a
“Pointer Incrementing” event at the remote terminal.
Writing a “0” to “1” transition into this bit-field causes the following to happen.
• A positive-stuff will occur (e.g., a single stuff-byte will be inserted into the
STS-3c/STS-3 data-stream, immediately after the H3 byte position within the
outbound STS-3c/STS-3 data stream).
• The “I” bits, within the H1 and H2 bytes will be inverted (to denote a
“Incrementing” Pointer Adjustment event).
• The contents of the H1 and H2 bytes will be incremented by “1”, and will be
used as the new pointer from this point on.
Note: Once the user writes a “1” into this bit-field, the XRT94L33 will
automatically clear this bit-field. Hence, there is no need to
subsequently reset this bit-field to “0”.
1
Insert
R/W Insert Continuous NDF Events:
Continuous
NDF Events
This READ/WRITE bit-field permits the user configure the Transmit STS-3c
POH and Transmit STS-3 TOH Processor blocks to continuously insert a New
Data Flag (NDF) pointer adjustment into the outbound STS-3c/STS-3 data
stream.
Note:
As the Transmit STS-3c POH and Transmit STS-3 TOH Processor
blocks insert the NDF event into the STS-1/STS-3 data stream, it will
proceed to load in the contents of the “Transmit STS-3c POH
Arbitrary H1 Pointer” and “Transmit STS-3c POH Arbitrary H2
Pointer” registers into the H1 and H2 bytes (within the outbound
STS-3c/STS-3 data stream).
0 – Configures the “Transmit STS-3c TOH and Transmit STS-3 POH
Processor” blocks to not continuously insert NDF events into the “outbound”
STS-3c/STS-3 data stream.
1- Configures the “Transmit STS-3c TOH and Transmit STS-3 POH
Processor” blocks to continuously insert NDF events into the “outbound” STS-
3c/STS-3 data stream.
0
Insert Single R/W Insert Single NDF Event:
NDF Event
This READ/WRITE bit-field permits the user to configure the Transmit STS-3c
POH and Transmit STS-3 TOH Processor blocks to insert a New Data Flag
(NDF) pointer adjustment into the outbound STS-3c/STS-3 data stream.
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