XRT79L71_1 Datasheet, PDF (391/434 Pages) Exar Corporation – 1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR-CHANNEL FRAMER IC -

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XRT79L71
1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR-CHANNEL FRAMER IC - REGISTER/MAP DESCRIPTION
BIT NUMBER
NAME
2
Copy Cell Enable
1
Discard Cell Enable
TYPE
R/W
R/W
DESCRIPTION
Copy Cell Enable - Transmit User Cell Filter # 1:
This READ/WRITE bit-field permits the user to either configure
Transmit User Cell Filter # 1 (within the Transmit ATM Cell Pro-
cessor Block) to copy all cells that have header byte patterns
that comply with the user-defined criteria, per Transmit User Cell
Filter # 1, or to NOT copy any of these cells.
If the user configures Transmit User Cell Filter # 1 to copy all
cells complying with a certain header-byte pattern, then a copy
(or replicate) of this compliant ATM cell will be routed to the
Transmit Cell Extraction Buffer.
If the user configures Transmit User Cell Filter # 1 to NOT copy
all cells complying with a certain header-byte pattern, then NO
copies (or replicates) of these compliant ATM cells will be made
nor will any be routed to the Transmit Cell Extraction Buffer.
0 - Configures Transmit User Cell Filter # 1 to NOT copy any
cells that have header byte patterns which are compliant with the
user-defined filtering criteria.
1 - Configures Transmit User Cell Filter # 1 to copy any cells that
have header byte patterns that are compliant with the user-
defined filtering criteria, and to route these copies (of cells) to the
Transmit Cell Extraction Buffer.
NOTE: This bit-field is only active if Transmit User Cell Filter # 1
has been enabled.
Discard Cell Enable - Transmit User Cell Filter # 1:
This READ/WRITE bit-field permits the user to either configure
Transmit User Cell Filter # 1 (within the Transmit ATM Cell Pro-
cessor Block) to discard all cells that have header byte patterns
that comply with the user-defined criteria, per Transmit User Cell
Filter # 1, or NOT discard any of these cells.
If the user configures Transmit User Cell Filter # 1 to NOT dis-
carded any cells that is compliant with a certain header-byte pat-
tern, then the cell will be retained for further processing.
0 - Configures Transmit User Cell Filter # 1 to NOT discard any
cells that have header byte patterns that are compliant with the
user-defined filtering criteria.
1 - Configures Transmit User Cell Filter # 1 to discard any cells
that have header byte patterns that are compliant with the user-
defined filtering criteria.
NOTE: This bit-field is only active if Transmit User Cell Filter # 1
has been enabled.
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