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| 型號： | 9250YF-27LF-T |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | 時(shí)鐘產(chǎn)生/分配 |
| 英文描述： | PROC SPECIFIC CLOCK GENERATOR, PDSO56 |
| 封裝： | 0.300 INCH, 0.25 INCH PITCH, ROHS COMPLIANT, MO-118, TSSOP-56 |
| 文件頁數(shù)： | 11/15頁 |
| 文件大?。?/td> | 195K |
| 代理商： | 9250YF-27LF-T |
IDTTM
Frequency Generator and Integrated Buffers for Celeron & PII/IIITM
0395F—01/25/10
ICS9250-27
Frequency Generator and Integrated Buffers for Celeron & PII/IIITM
5
Byte 3: ICS Reserved Functionality and frequency select register (Default as noted in PWD)
Note 1: For system operation, the BSEL lines of the CPU will program FS0, FS2 for the appropriate CPU speed, always
with SDRAM = 100MHz. After BIOS verifies the SDRAM is PC133 speed, then bit 0 can be written from the
default 0 to 1 to change the SDRAM output frequency from 100MHz to 133MHz. This will only change if the CPU
is at the 133MHz FSB speed as shown in this table. The CPU, 3v66, PCI, and IOAPIC clocks will be glitch free
during this transition, and only SDRAM will change.
Note 2: "ICS RESERVED BITS" must be writtern as "O".
Note3: Undefined bits can be written either as "1 or 0"
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Byte 2: Control Register
(1 = enable, 0 = disable)
Notes:
1. Inactive means outputs are held LOW and are disabled from switching. These outputs are designed to be
configured at power-on and are not expected to be configured during the normal modes of operation.
2. PWD = Power on Default
3. Undefined bit can be wirtten with either a "1" or "0".
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