XRT79L71_1 Datasheet, PDF (293/434 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
7-0
User Cell Filter # 1 -
Check Register - Header
Byte 4
TYPE
R/W
DESCRIPTION
User Cell Filter # 1 - Check Register - Header Byte 4:
The User Cell filtering criteria (for User Cell Filter # 1) is defined
based upon the contents of 9 read/write registers. These regis-
ters are the four Receive ATM Cell Processor Block - Receive
User Cell Filter # 1 - Pattern Registers, the four Receive ATM
Cell Processor Block - Receive User Cell Filter # 1 - Check Reg-
isters and the Receive ATM Cell Processor Block - Receive User
Cell Filter # 1 Control Register.
This READ/WRITE register, along with the Receive ATM Cell
Processor Block - Receive User Cell Filter # 1 - Pattern Register
- Header Byte 4 permits the user to define the User Cell Filtering
criteria for Octet # 4 within the incoming User Cell. More specifi-
cally, these READ/WRITE register bits permit the user to specify
which bit(s) in Octet 4 of the incoming user cell (in the Receive
ATM Cell Processor Block) are to be checked against the corre-
sponding bit-fields within the Receive ATM Cell Processor Block
- Receive User Cell Filter # 1 - Pattern Register - Header Byte 4
by the User Cell Filter, when determine whether to filter a given
User Cell.
Writing a "1" to a particular bit-field in this register, forces the
User Cell Filter to check and compare the corresponding bit in
Octet # 4 (of the incoming user cell) with the corresponding bit in
the Receive ATM Cell Processor Block - Receive User Cell Filter
# 1 - Pattern Register - Header Byte 4.
Writing a "0" to a particular bit-field in this register causes the
User Cell Filter to treat the corresponding bit within Octet # 4 (in
the incoming user cell) as a don't care (e.g., to forgo the compar-
ison between the corresponding bit in Octet # 4 of the incoming
user cell with the corresponding bit-field in the Receive ATM Cell
Processor Block - Receive User Cell Filter # 1 - Pattern Register
- Header Byte 4).
Receive ATM Cell Processor Block - Receive User Cell Filter # 1 - Filtered Cell Count - Byte 3 (Address
= 0x175C)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
User Cell Filter # 1 - Filtered Cell Count[31:24]
RUR
RUR
RUR
RUR
RUR
RUR
RUR
RUR
0
0
0
0
0
0
0
0
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