XRT79L71 Datasheet, PDF (428/441 Pages) Exar Corporation – 1 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC

XRT79L71
REV. P1.0.3
PRELIMINARY
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1 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC
BIT NUMBER
NAME
0
Filter if Pattern Match
TYPE
DESCRIPTION
R/W Filter if Pattern Match - Transmit User Cell Filter # 3:
This READ/WRITE bit-field permits the user to either configure Trans-
mit User Cell Filter # 3 to filter (based upon the configuration settings
for Bits 1 and 2, in this register) ATM cells with header bytes that
match the "user-defined" header byte patterns, or to filter ATM cells
with header bytes that do NOT match the "user-defined" header byte
patterns.
0 - Configures Transmit User Cell Filter # 3 to filter user cells that do
NOT match the header byte patterns (as defined in the " " registers).
1 - Configures Transmit User Cell Filter # 3 to filter user cells that do
match the header byte patterns (as defined in the " " registers).
NOTE: This bit-field is only active if "Transmit User Cell Filter # 3" has
been enabled.
TRANSMIT ATM CELL PROCESSOR BLOCK - TRANSMIT USER CELL FILTER # 3 - PATTERN
REGISTER - HEADER BYTE 1 (ADDRESS = 0X1F64)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
Transmit User Cell Filter # 3 - Pattern Register - Byte 1 [7:0]
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0
BIT NUMBER
NAME
TYPE
DESCRIPTION
7-0
Transmit User Cell Fil- R/W Transmit User Cell Filter # 3 - Pattern Register - Header Byte 1:
ter # 3 - Pattern Regis-
ter - Header Byte 1
The User Cell filtering criteria (for Transmit User Cell Filter # 3) is
defined based upon the contents of 9 read/write registers.
These registers are the four "Transmit ATM Cell Processor Block -
Transmit User Cell Filter # 3 - Pattern Registers", the four "Transmit
ATM Cell Processor Block - Transmit User Cell Filter # 3 - Check Reg-
isters" and the "Transmit ATM Cell Processor Block - Transmit User
Cell Filter # 3 Control Register.
This READ/WRITE register, along with the "Transmit ATM Cell Proces-
sor Block - Transmit User Cell Filter # 3 - Check Register - Header
Byte 1" permits the user to define the User Cell Filtering criteria for
"Octet # 1" of the incoming User Cell.
The user will write the header byte pattern (for Octet 1) that he/she
wishes to use as part of the "User Cell Filtering" criteria, into this reg-
ister.
The user will also write in a value into the "Transmit ATM Cell Proces-
sor Block - Transmit User Cell Filter # 3 - Check Register - Header
Byte 1" that indicates which bits within the first octet of the incoming
cells are to be compared with the contents of this register.
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