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參數資料
| 型號： | W48S87 |
| 廠商： | Cypress Semiconductor Corp. |
| 英文描述： | Spread Spectrum 3 DIMM Desktop Clock |
| 中文描述： | 擴頻3個DIMM桌面時鐘 |
| 文件頁數： | 8/19頁 |
| 文件大小： | 248K |
| 代理商： | W48S87 |
W48S87-72
8
Notes:
2.
3.
CPU, SDRAM, and PCI frequency selections are listed in
Table 1
and
Table 5
.
In Test Mode, the 48-/24-MHz clock outputs are:
- X1/2 if 48-MHz is selected.
- X1/4 if 24-MHz is selected.
Table 5. Additional Frequency Selections through Serial Data Interface Data Bytes
Date Byte 0
Bit 5
SEL_4
0
60/66_SEL
(Pin 18)
X
Date Byte 7
BIT 1
SEL_1
0
CPU0:3
SDRAM0:7
75.0
PCI_F
PCI0:5
CPU/2
Spread
Spectrum%
±0.5
Bit 4
SEL_3
0
Bit 2
SEL_2
0
BIT 0
SEL_0
0
0
0
X
0
0
1
75.0
32
±0.5
0
0
X
0
1
0
83.31
32
±0.5
0
0
X
0
1
1
33.41
CPU/2
±0.5
0
0
X
1
0
0
50.11
CPU/2
±0.5
0
0
X
1
0
1
68.52
CPU/2
±0.5
0
0
X
1
1
0
60.0
CPU/2
±0.5
0
0
0
1
1
1
60.0
CPU/2
±0.5
0
0
1
1
1
1
66.82
CPU/2
±0.5
0
1
0
X
X
X
60.0
CPU/2
±0.5
0
1
1
X
X
X
66.6
CPU/2
–
0.5
1
0
0
X
X
X
60.0
CPU/2
±0.5
1
0
1
X
X
X
66.6
CPU/2
–
0.5
1
1
0
X
X
X
60.0
CPU/2
±0.5
1
1
1
X
X
X
66.6
CPU/2
–
0.5
Table 6. Select Function for Data Byte 0, Bits 0:1
Function
Input Conditions
Output Conditions
Data Byte 0
Bit 1
CPU0:3,
SRAM0:7
PCI_F,
PCI0:5
REF0:2, IOAPIC
48/24MHZ
Bit 0
Normal Operation
0
0
Note 2
Note 2
14.318 MHz
48 or 24 MHz
Test Mode
0
1
X1/2
X1/4
X1
Note 3
Spread Spectrum On
1
0
Note 2
Note 2
14.318 MHz
48 or 24 MHz
Three-state
1
1
Hi-Z
Hi-Z
Hi-Z
Hi-Z
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相關代理商/技術參數 |
參數描述 |
|---|---|
| W48S87-04 | 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:Spread Spectrum 3 DIMM Desktop Clock |
| W48S87-72 | 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:Desktop/Notebook Frequency Generator |
| W48S87-72H | 制造商:Cypress Semiconductor 功能描述:Logic and Timing, Clock Generation, Desktop/Notebook Frequency Generator |
| W48S87-72XT | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
| W49 | 制造商:CERAMATE 制造商全稱:CERAMATE 功能描述:3-Phase Motor Driver for CD-ROMs |
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