Rev. 1.01 Step 3 – Upon reviewing Table 6, write the listed value (under the “Value to Write to D4 – D1 in CR0” register) into the D" />
參數(shù)資料
型號： XRT8001IDTR-F
廠商： Exar Corporation
文件頁數(shù)： 19/48頁
文件大?。?/td> 0K
描述： IC WAN CLOCK E1/E1 DUAL 18SOIC
產(chǎn)品變化通告： Packaging Change 15/Jul/2010
標準包裝： 1,000
類型： 時鐘/頻率發(fā)生器
PLL： 是
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： 表面貼裝
封裝/外殼： 18-SOIC（0.295"，7.50mm 寬）
供應商設備封裝： 18-SOIC
包裝： 帶卷 (TR)
XRT8001
26
Rev. 1.01
Step 3 – Upon reviewing Table 6, write the listed
value (under the “Value to Write to D4 – D1 in CR0”
register) into the D4 through D1 bit-fields within
Command Register CR0, as illustrated below:
Command Register CR0 (Address = 0x00)
D4
D3
D2
D1
D0
IOC4
IOC3
IOC2
IOC1
PL1EN
Value to Write to D4 – D1 in CR0
X
Notes:
1.
If the user wishes to output a clock signal via the CLK1
output signal, then he/she should also write a “1” into
the “PL1EN” bit-field within Command Register CR0.
2.
The contents of bit-fields D4 through D1 (within Com-
mand Register CR1) are “Don’t Care”
3.
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.
This step configures the XRT8001 to operate in the
“Fractional T1/E1 Reverse/Master” Mode.
Step 4 – Specify the value of “P” (e.g., as in the “P x
56kHz” or “P x 64kHz” clock signal which is to be input
via the FIN Reference Clock input).
In order to specify the value for “P”, one needs to write
in the value of “P - 1” (binary format) into Command
Register CR2, as illustrated below:
Command Register, CR2 (Address = 0x02)
D4
D3
D2
D1
D0
SEL14
SEL13
SEL12
SEL11
SEL10
Value of “P - 1” (in Binary Format).
In other words, if one intends to input either a “56kHz”
or “64kHz” clock signal via the “FIN” input pin (e.g.,
where P = 1), then he/she should write a “0” into
Command Register CR2.
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
6.4 The “E1 to T1 –Forward/Master” Mode
When the XRT8001 WAN Clock has been configured to
operate in the “E1 to T1 – Forward/Master” Mode, then
it will accept a “Q x 2.048MHz” clock signal via the
“Reference Clock” input at FIN (pin 3), where “Q” can
range anywhere between 1 - 16. In response to this
clock signal, the XRT8001 WAN Clock will output a
1.544MHz clock signal via the Clock Output pins
(CLK1 and/or CLK2).
A simple illustration of the XRT8001 WAN Clock,
operating in the “E1 to T1 - Forward/Master” Mode is
presented in Figure 16.
Step 5 – Write the binary expression “11111” into
Command Register CR3.
This step is necessary in order to insure proper opera-
tion of the XRT8001. This step is also illustrated below:
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相關代理商/技術參數(shù)
參數(shù)描述
XRT8001IP 制造商:EXAR 制造商全稱:EXAR 功能描述:WAN Clock for T1 and E1 Systems
XRT8001IP-F 功能描述:鎖相環(huán) - PLL RoHS:否 制造商:Silicon Labs 類型:PLL Clock Multiplier 電路數(shù)量:1 最大輸入頻率:710 MHz 最小輸入頻率:0.002 MHz 輸出頻率范圍:0.002 MHz to 808 MHz 電源電壓-最大:3.63 V 電源電壓-最小:1.71 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:QFN-36 封裝:Tray
XRT8010 制造商:EXAR 制造商全稱:EXAR 功能描述:312MHZ CLOCK & CRYSTAL MULTIPLIER WITH LVDS OUTPUTS
XRT8010ES 功能描述:鎖相環(huán) - PLL RoHS:否 制造商:Silicon Labs 類型:PLL Clock Multiplier 電路數(shù)量:1 最大輸入頻率:710 MHz 最小輸入頻率:0.002 MHz 輸出頻率范圍:0.002 MHz to 808 MHz 電源電壓-最大:3.63 V 電源電壓-最小:1.71 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:QFN-36 封裝:Tray
XRT8010IL 制造商:EXAR 制造商全稱:EXAR 功能描述:312MHZ CLOCK & CRYSTAL MULTIPLIER WITH LVDS OUTPUTS
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