Dial-A-Frequency
參數(shù)資料
型號: SL28541BZC
廠商: Silicon Laboratories Inc
文件頁數(shù): 8/31頁
文件大小: 0K
描述: IC CLOCK CK505 MOBILE 64TSSOP
標準包裝: 28
類型: 時鐘/頻率發(fā)生器
PLL:
主要目的: Intel CPU 服務器
輸入: 時鐘,晶體
輸出: HCSL,LVCMOS
電路數(shù): 1
比率 - 輸入:輸出: 1:21
差分 - 輸入:輸出: 無/是
頻率 - 最大: 400MHz
電源電壓: 3.135 V ~ 3.465 V
工作溫度: 0°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 64-TFSOP (0.240",6.10mm 寬)
供應商設備封裝: 64-TSSOP
包裝: 管件
SL28541
...................... DOC #: SP-AP-0063 (Rev. AA) Page 16 of 31
Dial-A-Frequency (CPU and SRC Clocks)
This feature allows the user to over-clock their system by
slowly stepping up the CPU or SRC frequency. When the
programmable output frequency feature is enabled, the CPU
and SRC frequencies are determined by the following
equation:
Fcpu = G * N/M or Fcpu=G2 * N, where G2 = G / M.
“N” and “M” are the values programmed in Programmable
Frequency Select N-Value Register and M-Value Register,
respectively.
“G” stands for the PLL Gear Constant, which is determined
by the programmed value of FS[E:A]. See Table 1,
Frequency Select Table for the Gear Constant for each
Frequency selection. The PCI Express only allows user
control of the N register, the M value is fixed and
documented in Table 1, Frequency Select Table.
In this mode, the user writes the desired N and M values into
the DAF I2C registers. The user cannot change only the M
value and must change both the M and the N values at the
same time, if they require a change to the M value. The user
may change only the N value.
Associated Register Bits
CPU_DAF Enable – This bit enables CPU DAF mode. By
default, it is not set. When set, the operating frequency is
determined by the values entered into the CPU_DAF_N
register. Note that the CPU_DAF_N and M register must
contain valid values before CPU_DAF is set. Default = 0,
(No DAF).
CPU_DAF_N – There are nine bits (for 512 values) to
linearly change the CPU frequency (limited by VCO range).
Table 7. PLL3/SE Configuration Table
GCLK_SEL
B1b4
B1b3
B1b2
B1b1
Pin 24 (17) MHz Pin 25 (18) MHz Spread (%)
Comment
0
0000
PLL3 Disabled
0
0001
100
0.5
SRC1 from SRC_Main
0
0010
100
0.5
LCD_100 from PLL3
0
0011
100
1
LCD_100 from PLL3
0
0100
100
1.5
LCD_100 from PLL3
0
0101
100
2
LCD_100 from PLL3
0
0110
N/A
0
0111
N/A
0
1000
N/A
0
1001
N/A
0
1010
N/A
0
1011
N/A
0
1100
N/A
none
N/A
0
1101
N/A
0
1110
N/A
0
1111
N/A
1
0000
N/A
1
0001
27M_NSS
27M_SS
0.5
27M_SS from PLL3
1
0010
27M_NSS
27M_SS
0.5
27M_SS from PLL3
1
0011
27M_NSS
27M_SS
1
27M_SS from PLL3
1
0100
27M_NSS
27M_SS
1.5
27M_SS from PLL3
1
0101
27M_NSS
27M_SS
2
27M_SS from PLL3
1
0110
N/A
1
0111
N/A
1
1000
N/A
1
1001
N/A
1
1010
N/A
1
1011
N/A
1
1100
N/A
1
1101
N/A
相關PDF資料
PDF描述
D38999/20SD18SB CONN RCPT 18POS WALL MNT W/SCKT
VE-B22-MY-S CONVERTER MOD DC/DC 15V 50W
VE-23Z-MX-S CONVERTER MOD DC/DC 2V 30W
D38999/20JE6HA CONN RCPT 6POS WALL MNT W/PINS
VE-22K-MY-S CONVERTER MOD DC/DC 40V 50W
相關代理商/技術參數(shù)
參數(shù)描述
SL28541BZC-2 功能描述:時鐘發(fā)生器及支持產(chǎn)品 Montevina, Atom RoHS:否 制造商:Silicon Labs 類型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數(shù)量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-56
SL28541BZC-2T 功能描述:時鐘發(fā)生器及支持產(chǎn)品 Montevina, Atom RoHS:否 制造商:Silicon Labs 類型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數(shù)量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-56
SL28541BZCT 功能描述:時鐘發(fā)生器及支持產(chǎn)品 Montevina RoHS:否 制造商:Silicon Labs 類型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數(shù)量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-56
SL28541BZI 功能描述:時鐘發(fā)生器及支持產(chǎn)品 Montevina RoHS:否 制造商:Silicon Labs 類型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數(shù)量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-56
SL28541BZI-2 功能描述:時鐘發(fā)生器及支持產(chǎn)品 Montevina, Atom RoHS:否 制造商:Silicon Labs 類型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數(shù)量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-56