參數(shù)資料
型號: XRT75R12IB
廠商: EXAR CORP
元件分類: 數(shù)字傳輸電路
英文描述: TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR
中文描述: DATACOM, PCM TRANSCEIVER, PBGA420
封裝: 35 X 35 MM, TBGA-420
文件頁數(shù): 83/89頁
文件大?。?/td> 457K
代理商: XRT75R12IB
PRELIMINARY
XRT75R12
REV. P1.0.2
TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR
80
T
ABLE
38: XRT75R12 R
EGISTER
MAP
SHOWING
J
ITTER
A
TTENUATOR
C
ONTROL
R
EGISTERS
(JA_
N
)
T
ABLE
39: J
ITTER
A
TTENUATOR
C
ONTROL
R
EGISTER
- C
HANNEL
N
A
DDRESS
L
OCATION
= 0
XM
7
B
IT
7
B
IT
6
B
IT
5
B
IT
4
B
IT
3
B
IT
2
B
IT
1
B
IT
0
Reserved
JA RESET
Ch_n
JA1 Ch_n
JA in Tx Path
Ch_n
JA0 Ch_n
R/W
R/W
R/W
R/W
B
IT
N
UMBER
N
AME
T
YPE
D
ESCRIPTION
7 - 4
Reserved
3
JA RESET Ch_n
R/W
Jitter Attenuator RESET - Channel_n:
Writing a "0 to 1" transition within this bit-field will configure the Jitter
Attenuator (within Channel_n) to execute a RESET operation.
Whenever the user executes a RESET operation, then following will
occur.
The READ and WRITE pointers (within the Jitter Attenuator FIFO)
will be reset to their default values.
The contents of the Jitter Attenuator FIFO will be flushed.
N
OTE
:
The user must follow up any "0 to 1" transition with the
appropriate write operate to set this bit-field back to "0", in
order to resume normal operation with the Jitter Attenuator.
2
JA1 Ch_n
R/W
Jitter Attenuator Configuration Select Input - Bit 1:
This READ/WRITE bit-field, along with Bit 0 (JA0 Ch_n) is used to do
any of the following.
To enable or disable the Jitter Attenuator corresponding to
Channel_n.
To select the FIFO Depth for the Jitter Attenuator within Channel_n.
The relationship between the settings of these two bit-fields and the
Enable/Disable States, and FIFO Depths is presented below.
JA0
JA1
Jitter Attenuator Mode
1
1
Disabled
1
0
Disabled
0
1
FIFO Depth = 32 bits
0
0
FIFO Depth = 16 bits
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