參數(shù)資料
型號: XRT83VSH28IB
廠商: EXAR CORP
元件分類: 數(shù)字傳輸電路
英文描述: 8-CHANNEL E1 SHORT-HAUL LINE INTERFACE UNIT
中文描述: DATACOM, PCM TRANSCEIVER, PBGA225
封裝: 19 X 19 MM, 1 MM PITCH, PLASTIC, BGA-225
文件頁數(shù): 25/74頁
文件大?。?/td> 574K
代理商: XRT83VSH28IB
PRELIMINARY
8-CHANNEL E1 SHORT-HAUL LINE INTERFACE UNIT
XRT83VSH28
22
REV. P1.0.0
2.2
Clock and Data Recovery
The receive clock (RCLK) is recovered by the clock and data recovery circuitry. An internal PLL locks on the
incoming data stream and outputs a clock that’s in phase with the incoming signal. This allows for multi-
channels to arrive from different timing sources and remain independent. In the absence of an incoming
signal, RCLK maintains its timing by using the internal master clock as its reference. The recovered data can
be updated on either edge of RCLK. By default, data is updated on the rising edge of RCLK. To update data
on the falling edge of RCLK, set RCLKE to "1" in the appropriate global register.
Figure 6
is a timing diagram
of the receive data updated on the rising edge of RCLK.
Figure 7
is a timing diagram of the receive data
updated on the falling edge of RCLK. The timing specifications are shown in
Table 4
.
F
IGURE
6. R
ECEIVE
D
ATA
U
PDATED
ON
THE
R
ISING
E
DGE
OF
RCLK
F
IGURE
7. R
ECEIVE
D
ATA
U
PDATED
ON
THE
F
ALLING
E
DGE
OF
RCLK
N
OTE
:
VDD=3.3V ±5%, T
A
=25°C, Unless Otherwise Specified
T
ABLE
4: T
IMING
S
PECIFICATIONS
FOR
RCLK/RPOS/RNEG
P
ARAMETER
S
YMBOL
M
IN
T
YP
M
AX
U
NITS
RCLK Duty Cycle
R
CDU
45
50
55
%
Receive Data Setup Time
R
SU
150
-
-
ns
Receive Data Hold Time
R
HO
150
-
-
ns
RCLK to Data Delay
R
DY
-
-
40
ns
RCLK Rise Time (10% to 90%)
with 25pF Loading
RCLK
R
-
-
40
ns
RCLK Fall Time (90% to 10%)
with 25pF Loading
RCLK
F
-
-
40
ns
RCLK
RPOS
or
RNEG
R
DY
RCLK
R
RCLK
F
R
OH
RCLK
RPOS
or
RNEG
R
DY
RCLK
F
RCLK
R
R
OH
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