XRT79L71_1 Datasheet, PDF (390/434 Pages) Exar Corporation – 1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR-CHANNEL FRAMER IC -

XRT79L71
1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR-CHANNEL FRAMER IC - REGISTER/MAP DESCRIPTION
REV. 1.0.0
BIT NUMBER
NAME
7-0
Transmit User Cell Filter
# 0 - Filtered Cell
Count[7:0]
TYPE
RUR
DESCRIPTION
Transmit User Cell Filter # 0 - Filtered Cell Count[7:0]:
These RESET-upon-READ bit-fields, along with that in the
Transmit ATM Cell Processor Block - Transmit User Cell Filter #
0 - Filtered Cell Count - Bytes 3 through 1 register contain a 32-
bit expression for the number of User Cells that have been fil-
tered by Transmit User Cell Filter # 0 since the last read of this
register.
Depending upon the configuration settings within the Transmit
ATM Cell Processor Block - Transmit User Cell Filter Control -
Transmit User Cell Filter # 0 Register (Address = 0x1F43), these
register bits will be incremented anytime Transmit User Cell Fil-
ter # 0 performs any of the following functions.
• Discards an incoming User Cell.·
• Copies (or Replicates) an incoming User Cell and routes the
copy to the Transmit Cell Extraction Buffer.
• Both of these actions.
This particular register contains the LSB (Least Significant Byte)
value for this 32-bit expression.
NOTE:
If the number of filtered cells reaches the value
"0xFFFFFFFF" then these registers will saturate to and
remain at this value (e.g., it will not overflow to
"0x00000000").
Transmit ATM Cell Processor Block - Transmit User Cell Filter Control - Filter 1 (Address = 0x1F53)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
Unused
Transmit
User Cell Fil-
ter # 1
Enable
Copy Cell
Enable
Discard Cell
Enable
Filter if
Pattern
Match
R/O
R/O
R/O
R/O
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0
BIT NUMBER
NAME
7-4
Unused
3
Transmit User Cell Filter
# 1 Enable
TYPE
R/O
R/W
DESCRIPTION
Transmit User Cell Filter # 1 - Enable:
This READ/WRITE bit-field permits the user to either enable or
disable Transmit User Cell Filter # 1.
If the user enables Transmit User Cell Filter # 1, then Transmit
User Cell Filter # 1 will function per the configuration settings in
Bits 2 through 0, within this register.
If the user disables Transmit User Cell Filter # 1, then Transmit
User Cell Filter # 1 then all cells that are applied to the input of
Transmit User Cell Filter # 1 will pass through to the output of
Transmit User Cell Filter # 1.
0 - Disables Transmit User Cell Filter # 1.
1 - Enables Transmit User Cell Filter # 1.
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