Rev. 1.01 For example, if the user wishes to input a clock signal of 2.048MHz, to the “FIN” input pin (e.g., where Q = 1), then he/s" />
參數(shù)資料
型號: XRT8001IP-F
廠商: Exar Corporation
文件頁數(shù): 21/48頁
文件大?。?/td> 0K
描述: IC WAN CLOCK E1/E1 DUAL 18PDIP
產(chǎn)品變化通告: XRT obsolescence 05/Mar/2012
標準包裝: 41
類型: 時鐘/頻率發(fā)生器
PLL:
主要目的: 以太網(wǎng)(WAN),T1/E1
輸入: 時鐘
輸出: 時鐘
電路數(shù): 1
比率 - 輸入:輸出: 1:2
差分 - 輸入:輸出: 無/無
頻率 - 最大: 16.384kHz
電源電壓: 3.3 V ~ 5 V
工作溫度: -40°C ~ 85°C
安裝類型: 通孔
封裝/外殼: 18-DIP(0.300",7.62mm)
供應商設備封裝: 18-PDIP
包裝: 管件
XRT8001
28
Rev. 1.01
For example, if the user wishes to input a clock signal
of 2.048MHz, to the “FIN” input pin (e.g., where Q = 1),
then he/she should write a “0” into Command Register
CR1.
Note: If the user wishes to output a clock signal via the
CLK2 output signal, then he/she should also write a “1” into
the “PL2EN” bit-field within Command Register CR1.
Step 4 – Write the binary expression “11111” into
Command Register CR2, as illustrated below.
This step is necessary in order to insure proper opera-
tion of the XRT8001.
Command Register, CR2 (Address = 0x02)
D4
D3
D2
D1
D0
SEL14
SEL13
SEL12
SEL11
SEL10
1
Step 5 – Write the binary expression “11111” into
Command Register CR3, as illustrated below.
This step is necessary in order to insure proper opera-
tion of the XRT8001. This step is also illustrated
below.
Command Register, CR3 (Address = 0x03)
D4
D3
D2
D1
D0
SEL24
SEL23
SEL22
SEL21
SEL20
1
Step 6 – Enable any of the following output signals as
appropriate:
“SYNC”, “CLK1”, “CLK2” and
“LOCKDET”.
This is accomplished by writing a “1” into the corre-
sponding bit-fields, within Command Register CR4, as
illustrated below.
Command Register CR4, (Address = 0x04)
D4
D3
D2
D1
D0
SYNCEN
CLK1EN
CLK2EN
LDETDIS2
LDETDIS1
1
0
6.6 The “High Speed – Reverse” Mode
When the XRT8001 WAN Clock has been configured to
operate in the “High Speed – Reverse” Modes, its
operation is independent of whether it has been config-
ured in the "Master" or "Slave" Mode.
When the XRT8001 WAN Clock has been configured to
operate in the “High Speed – Reverse” Modes, then it
will accept a “64kHz” clock signal via the “Reference
Clock” input at FIN (pin 3). In response, to this clock
signal, the XRT8001 WAN Clock will output an “M x
2.048MHz” clock signal via the Clock Output pins
(CLK1 and/or CLK2); where M can only have the values
1, 2,4 or 8.
A simple illustration of the XRT8001 WAN Clock,
operating in the “High Speed – Reverse” Mode is
presented in Figure 17.
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