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參數(shù)資料
| 型號： | CY28349B |
| 廠商： | Cypress Semiconductor Corp. |
| 英文描述： | FTG for Intel Pentium 4 CPU and Chipsets |
| 中文描述： | FTG的英特爾奔騰4處理器和芯片組 |
| 文件頁數(shù)： | 13/22頁 |
| 文件大?。?/td> | 174K |
| 代理商： | CY28349B |
CY28349B
Document #: 38-07454 Rev. *A
Page 13 of 22
Programmable Output Frequency, Watchdog
Timer and Recovery Output Frequency
Functional Description
The Programmable Output Frequency feature allows users to
generate any CPU output frequency from the range of 50 MHz
to 248 MHz. Cypress offers the most dynamic and the simplest
programming interface for system developers to utilize this
feature in their platforms.
The Watchdog Timer and Recovery Output Frequency
features allow users to implement a recovery mechanism
when the system hangs or gets unstable. System BIOS or
other control software can enable the Watchdog Timer before
they attempt to make a frequency change. If the system hangs
and a Watchdog Timer time-out occurs, a system reset will be
generated and a recovery frequency will be activated.
All of the related registers are summarized in
Table 5
.
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
1
1
1
1
1
1
1
1
0
1
1
1
1
0
0
0
0
1
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
1
0
1
0
1
0
1
0
1
0
1
0
1
170.0
175.0
180.0
185.0
190.0
166.8
100.2
133.6
200.4
166.6
100.0
200.0
133.3
68.0
70.0
72.0
74.0
76.0
66.7
66.8
66.8
66.8
66.6
66.6
66.6
66.6
34.0
35.0
36.0
37.0
38.0
33.4
33.4
33.4
33.4
33.3
33.3
33.3
33.3
48.00741
48.00741
48.00741
48.00741
48.00741
48.00741
48.00741
48.00741
48.00741
48.00741
48.00741
48.00741
48.00741
Table 4. Frequency Selection Table
(continued)
Input Conditions
FS4
FS3
FS2
SEL4
SEL3
SEL2
Output Frequency
PLL Gear
Constants
(G)
FS1
SEL1
FS0
SEL0
CPU
3V66
PCI
Table 5. Register Summary
Name
Description
Pro_Freq_EN
Programmable output frequencies enabled
0 = Disabled (default)
1 = Enabled.
When it is disabled, the operating output frequency will be determined by either the latched value of
FS[4:0] inputs or the programmed value of SEL[4:0]. If FS_Override bit is clear, latched FS[4:0] inputs
will be used. If FS_Override bit is set, programmed value of SEL[4:0] will be used.
When it is enabled, the CPU output frequency will be determined by the programmed value of
CPUFSEL_N, CPUFSEL_M and the PLL Gear Constant. The program value of FS_Override, SEL[4:0]
or the latched value of FS[4:0] will determine the PLL Gear Constant and the frequency ratio between
CPU and other frequency outputs.
When Pro_Freq_EN is cleared or disabled,
0 = Select operating frequency by FS input pins (default)
1 = Select operating frequency by SEL bits in SMBus control bytes.
When Pro_Freq_EN is set or enabled,
0 = Frequency output ratio between CPU and other frequency groups and the PLL Gear Constant are
based on the latched value of FS input pins (default)
1 = Frequency output ratio between CPU and other frequency groups and the PLL Gear Constant are
based on the programmed value of SEL bits in SMBus control bytes.
FS_Override
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| CY28349BOC | FTG for Intel Pentium 4 CPU and Chipsets |
| CY28349BOCT | FTG for Intel Pentium 4 CPU and Chipsets |
| CY28378 | FTG for Pentium 4 and Intel 845 Series Chipset |
| CY28378OC | FTG for Pentium 4 and Intel 845 Series Chipset |
| CY28378OCT | FTG for Pentium 4 and Intel 845 Series Chipset |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CY28349B_05 | 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:FTG for Intel㈢ Pentium㈢ 4 CPU and Chipsets |
| CY28349BOC | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| CY28349BOCT | 制造商:Rochester Electronics LLC 功能描述:FTG FOR INTEL 830M AND 845 CHIPSETS (CK-408) - Bulk |
| CY28349BOXC | 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:FTG for Intel㈢ Pentium㈢ 4 CPU and Chipsets |
| CY28349BOXCT | 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:FTG for Intel㈢ Pentium㈢ 4 CPU and Chipsets |
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