Rev. 1.01 Step 3 – Upon reviewing Table 4, write the listed value (under the “Value to Write to D4 – D1 in CR0” Register Column) int" />
參數(shù)資料
型號： XRT8001IDTR-F
廠商： Exar Corporation
文件頁數(shù)： 15/48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(biāo)準(zhǔn)包裝： 1,000
類型： 時(shí)鐘/頻率發(fā)生器
PLL： 是
主要目的： 以太網(wǎng)（WAN），T1/E1
輸入： 時(shí)鐘
輸出： 時(shí)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(yīng)商設(shè)備封裝： 18-SOIC
包裝： 帶卷 (TR)
XRT8001
22
Rev. 1.01
Step 3 – Upon reviewing Table 4, write the listed value
(under the “Value to Write to D4 – D1 in CR0” Register
Column) into the D4 through D1 bit-fields within Com-
mand Register CR0, as illustrated below.
Note: 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.
This step configures the XRT8001 to operate in the
“Forward/Master” Mode.
Step 4 – Next, you need to specify the value for “N”
(e.g., as in the “N x 1.544MHz” or “N x 2.048MHz” clock
signal which is to be applied to the “FIN” input pin.)
In order to specify the value for “N”, one needs to write
the value of “N - 1” (in binary format) into the “D4 through
D1” bits within Command Register CR1, 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
Command Register, CR1 (Address = 0x01)
D4
D3
D2
D1
D0
M4
M3
M2
M1
PL2EN
Value of “N - 1” (in Binary Format)
X
For example, if the user wishes to configure the
XRT8001 to accept a 1.544MHz clock signal, via the
“FIN” input pin (e.g., N = 1), then the user should write
in the value “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 5 – Specify the value of “K” (e.g., as in the “K x
56kHz” or “K x 64kHz” clock signal which is to be output
via the CLK1 output signal).
Command Register, CR2 (Address = 0x02)
D4
D3
D2
D1
D0
SEL14
SEL13
SEL12
SEL11
SEL10
Value of “K - 1” (in Binary Format).
For example, if one wishes to configure the XRT8001
to output a clock signal of either “56kHz” or “64kHz”
(e.g., where “K” = 1) via the CLK1 output pin, then he/
she should write the value “0”, into Command Register
CR2.
Step 6 – Specify the value of “K” (e.g., as in the “K x
56kHz” or “K x 64kHz” clock signal which is to be output
via the CLK2 output signal).
In order to specify the value for “K”, one needs to write
the value of “K - 1” (binary format) into Command
Register CR3, as illustrated below.
Command Register, CR3 (Address = 0x03)
D4
D3
D2
D1
D0
SEL24
SEL23
SEL22
SEL21
SEL20
Value of “K - 1” (in Binary Format).
For example, if one wishes to configure the XRT8001
to output a clock signal of either “1.792MHz” or
“2.048MHz” (e.g., where “K” = 32) via the CLK2 output
pin, then he/she should write the value “31” (or “1 1 1
1 1” in binary format) into Command Register CR3.
Step 7 – 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
Note: For information on the “LDETDIS1” and “LDETDIS2”
bit-fields, please see Table 3.
In order to specify the value for “K”, one needs to write
the value of “K - 1” (in binary format) into Command
Register CR2, as illustrated below.
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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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