參數資料
型號: XRT72L74
廠商: Exar Corporation
元件分類: 通信及網絡
英文描述: Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
中文描述: Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
文件頁數: 64/104頁
文件大小: 1301K
代理商: XRT72L74
XRT72L74
FOUR CHANNEL, DS3 ATM UNI/CLEAR-CHANNEL FRAMER
REV. P1.0.0
á
PRELIMINARY
64
T
ABLE
26:
T
X
D
S
3 F-B
IT
M
ASK
2 R
EGISTER
R
EGISTER
25 T
X
D
S
3 F-B
IT
M
ASK
2 R
EGISTER
H
EX
A
DDRESS
: 0
X
19
B
IT
F
UNCTION
T
YPE
D
EFAULT
D
ESCRIPTION
-O
PERATION
7
F-bit Mask (23)
R/W
0
The Transmit DS3 Framer block performs an XOR operation of the F-Bit
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)
corresponds to 2nd F-Bit (F0)in the DS3 frame,...FBitMask(27) corresponds
to the last F-Bit of the M-Frame.
N
OTES
:
1. Setting any of these bit-fields to “1” will cause an “erred” F-bit to be
transmitted onto the line.
2. For normal operation, set each of these bit-fields to “0”.
6
F-bit Mask (22)
R/W
0
5
F-bit Mask (21)
R/W
0
4
F-bit Mask (20)
R/W
0
3
F-bit Mask (19)
R/W
0
2
F-bit Mask (18)
R/W
0
1
F-bit Mask (17)
R/W
0
0
F-bit Mask (16)
R/W
0
T
ABLE
27:
T
X
DS3 F-B
IT
M
ASK
3 R
EGISTER
R
EGISTER
26 T
X
DS3 F-B
IT
M
ASK
3 R
EGISTER
H
EX
A
DDRESS
: 0
X
1A
B
IT
F
UNCTION
T
YPE
D
EFAULT
D
ESCRIPTION
-O
PERATION
7
F-bit Mask (15)
R/W
0
The Transmit DS3 Framer block performs an XOR operation of the FBitMask
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-
sponds to 2nd F-Bit (F0)in the DS3 frame,...FBitMask(27) corresponds to the
last F-Bit of the M-Frame.
N
OTES
:
1. Setting any of these bit-fields to “1” will cause an “erred” F-
bit to be transmitted onto the line.
2. For normal operation,set each of these bit-fields to “0”.
6
F-bit Mask (14)
R/W
0
5
F-bit Mask (13)
R/W
0
4
F-bit Mask (12)
R/W
0
3
F-bit Mask (11)
R/W
0
2
F-bit Mask (10)
R/W
0
1
F-bit Mask (9)
R/W
0
0
F-bit Mask (8)
R/W
0
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