XRT79L71 Datasheet, PDF (310/441 Pages) Exar Corporation – 1 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC

XRT79L71
REV. P1.0.3
BIT NUMBER
NAME
3
User Cell Filter # 1
Enable
2
Copy Cell Enable
1
Discard Cell Enable
PRELIMINARY
áç
1 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC
TYPE
R/W
R/W
R/W
DESCRIPTION
User Cell Filter # 1 - Enable:
This READ/WRITE bit-field permits the user to either enable or
disable User Cell Filter # 1. If the user enables User Cell Filter #
1, then User Cell Filter # 0 will function per the configuration set-
tings in Bits 2 through 0, within this register.
If the user disables User Cell Filter # 1, then User Cell Filter # 0
then all cells that are applied to the input of User Cell Filter # 1
will pass through to the output of User Cell Filter # 1.
0 - Disables User Cell Filter # 1.
1 - Enables User Cell Filter # 1.
Copy Cell Enable - User Cell Filter # 1:
This READ/WRITE bit-field permits the user to either configure
User Cell Filter # 1 (within the Receive ATM Cell Processor
Block) to copy all cells that have header byte patterns that com-
ply with the "user-defined" criteria, per User Cell Filter # 1, or to
NOT copy any of these cells.
If the user configures User Cell Filter # 1 to copy all cells comply-
ing with a certain "header-byte" pattern, then a copy (or repli-
cate) of this "compliant" ATM cell will be routed to the Receive
Cell Extraction Buffer.
If the user configures 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 Receive Cell Extraction Buffer.
0 - Configures 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 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
Receive Cell Extraction Buffer.
NOTE: This bit-field is only active if "User Cell Filter # 0" has
been enabled.
Discard Cell Enable - User Cell Filter # 1:
This READ/WRITE bit-field permits the user to either configure
User Cell Filter # 1 (within the Receive ATM Cell Processor
Block) to discard all cells that have header byte patterns that
comply with the "user-defined" criteria, per User Cell Filter # 1, or
NOT discard any of these cells.
If the user configures User Cell Filter # 1 to NOT discard any
cells that is compliant with a certain "header-byte" pattern, then
the cell will be retained for further processing.
0 - Configures 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 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 "User Cell Filter # 1" has
been enabled.
298