XRT72L71 Datasheet, PDF (65/102 Pages) Exar Corporation – DS3 ATM UNI/CLEAR CHANNEL FRAMER

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REGISTER 25
BIT
FUNCTION
7 F-bit Mask (23)
6 F-bit Mask (22)
5 F-bit Mask (21)
4 F-bit Mask (20)
3 F-bit Mask (19)
2 F-bit Mask (18)
1 F-bit Mask (17)
0 F-bit Mask (16)
REGISTER 26
BIT
FUNCTION
7 F-bit Mask (15)
6 F-bit Mask (14)
5 F-bit Mask (13)
4 F-bit Mask (12)
3 F-bit Mask (11)
2 F-bit Mask (10)
1 F-bit Mask (9)
0 F-bit Mask (8)
REGISTER 27
BIT
FUNCTION
7 F-bit Mask (7)
6 F-bit Mask (6)
5 F-bit Mask (5)
4 F-bit Mask (4)
3 F-bit Mask (3)
2 F-bit Mask (2
1 F-bit Mask (1)
0 F-bit Mask (0)
XRT72L71
DS3 ATM UNI/CLEAR CHANNEL FRAMER
REV. 1.1.0
TABLE 26: TX DS3 F-BIT MASK2 REGISTER
TX DS3 F-BIT MASK2 REGISTER
HEX ADDRESS: 0X19
TYPE
R/W
DEFAULT
0
DESCRIPTION-OPERATION
R/W
0
R/W
0
The Transmit DS3 Framer block performs an XOR operation of the F-Bit
R/W
0
Mask bits, with the corresponding “F” bits, within each outbound DS3 frame.
FBitMask(0) corresponds to first F-Bit (F1) is the DS3 frame, FBitMask (1)
R/W
0
corresponds to 2nd F-Bit (F0)in the DS3 frame,...FBitMask(27) corresponds
to the last F-Bit of the M-Frame.
R/W
0
NOTES:
R/W
0
1. Setting any of these bit-fields to “1” will cause an “erred” F-bit to be
transmitted onto the line.
R/W
0
2. For normal operation, set each of these bit-fields to “0”.
TABLE 27: TX DS3 F-BIT MASK3 REGISTER
TX DS3 F-BIT MASK3 REGISTER
HEX ADDRESS: 0X1A
TYPE
DEFAULT
DESCRIPTION-OPERATION
R/W
0
R/W
0
R/W
0
The Transmit DS3 Framer block performs an XOR operation of the FBitMask
R/W
0
bits, with the corresponding “F” bits, within each outbound DS3 frame. FBit-
Mask(0) corresponds to first F-Bit (F1) is the DS3 frame, FBitMask (1) corre-
R/W
0
sponds to 2nd F-Bit (F0)in the DS3 frame,...FBitMask(27) corresponds to the
last F-Bit of the M-Frame.
R/W
0
NOTES:
R/W
0
1. Setting any of these bit-fields to “1” will cause an “erred” F-
bit to be transmitted onto the line.
R/W
0
2. For normal operation,set each of these bit-fields to “0”.
TABLE 28: TX DS3 F-BIT MASK4 REGISTER
TX DS3 F-BIT MASK4 REGISTER
HEX ADDRESS: 0X1B
TYPE
R/W
DEFAULT
0
DESCRIPTION-OPERATION
R/W
0
R/W
0
The Transmit DS3 Framer block performs an XOR operation of the FBitMask
R/W
0
bits, with the corresponding “F” bits, within each outbound DS3 frame. FBit-
Mask(0) corresponds to first F-Bit (F1) is the DS3 frame, FBitMask (1) corre-
R/W
0
sponds to 2nd F-Bit (F0)in the DS3 frame,...FBitMask(27) corresponds to the
last F-Bit of the M-Frame.
R/W
0
NOTES:
R/W
0
1. Setting any of these bit-fields to “1” will cause an “erred” F-bit to be
transmitted onto the line.
R/W
0
2. For normal operation, set each of these bit-fields to “0”.
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