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PRELIMINARY
DS3 UNI FOR ATM
XRT7245
REV. 1.03
101
This “Read/Write” register along with the “Rx CP Idle
Cell Pattern Header—Bytes, 1, 2, and 4” registers are
used to specify, to the Receive Cell Processor, the
header byte patterns for Idle Cells. The Receive Cell
Processor will use this information to identify the Idle
Cells from the stream of cells that it receives from the
Receive DS3 Framer (or Receive PLCP Processor).
The purpose of this particular register (along with the
“Rx CP Idle Cell Mask Header—Byte 3” register) is to
allow the user to define the pattern for header byte 3
of the Idle Cells.
For more information on Idle Cell Handling, please
see Section 7.3.2.3.1.
3.3.2.83
Rx CP Idle Cell Pattern Header—Byte 4
This “Read/Write” register along with the “Rx CP Idle
Cell Pattern Header—Bytes, 1 through 3” registers are
used to specify, to the Receive Cell Processor, the
header byte patterns for Idle Cells. The Receive Cell
Processor will use this information to identify the Idle
Cells from the stream of cells that it receives from the
Receive DS3 Framer (or Receive PLCP Processor).
The purpose of this particular register (along with the
“Rx CP Idle Cell Mask Header—Byte 4” register) is to
allow the user to define the pattern for header byte 4
of the Idle Cells.
For more information on Idle Cell Handling, please
see Section 7.3.2.3.1.
3.3.2.84
Rx CP Idle Cell Mask Header—Byte 1
This “Read/Write” register allows the user to specify
which bit(s), in byte 1 of the incoming Idle cell (in the
Receive Cell Processor) are to be checked against the
corresponding bit(s) in the “Rx CP Idle Cell Pattern
Header—Byte 1” register (Address = 50h) by the Idle
Cell Filter, when the Receive Cell Processor is trying
to determine if an incoming cell is an Idle Cell or not.
Writing a “1” to a particular bit in this register, forces
the Receive Cell Processor to check and compare the
corresponding bit in byte 1 of the incoming cell with
the corresponding bit in the “Rx CP Idle Cell Pattern
Header—Byte 1” register.
Writing a “0” to a particular bit, causes the Receive
Cell Processor to treat the corresponding bit of byte 1
in the incoming cell as a “don’t care” (e.g., to forgo
the comparison between the corresponding bit in
byte 1 of the incoming cell with the corresponding bit
in the “Rx CP Idle Cell Pattern Header—Byte 1”
register.)
For more information on Idle Cell Handling, please
see Section 7.3.2.3.1.
Address = 53h, Rx CP Idle Cell Pattern Header—Byte 4
B
IT
7
B
IT
6
B
IT
5
B
IT
4
B
IT
3
B
IT
2
B
IT
1
B
IT
0
Rx Idle Cell Pattern—Byte 4
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0
Address = 54h, Rx CP Idle Cell Mask Header—Byte 1
B
IT
7
B
IT
6
B
IT
5
B
IT
4
B
IT
3
B
IT
2
B
IT
1
B
IT
0
Rx Idle Cell Mask Header—Byte 1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
1
1
1
1
1
1
1
1