CY2280 Cypress Semiconductor, CY2280 Datasheet - Page 3

• Manufacturer Part Number: CY2280
• Description: 100-MHz Pentium II Clock Synthesizer/Driver with Spread Spectrum for Mobile or Desktop PCs
• Manufacturer: Cypress Semiconductor

Function Table (-11S Option)
Function Table (-21S Option)
Actual Clock Frequency Values
Power Management Logic
Document #: 38-07207 Rev. *A
CPUCLK
CPUCLK
USBCLK
X
0
0
1
1
Notes:
SEL100 SEL1 SEL0
0
0
0
0
0
1
1
1
1
1
SEL100 SEL1 SEL0
0
0
0
0
0
1
1
1
1
1
CPU_STOP
2.
3.
Clock Output
Target frequency is modulated by percentage shown (max.) when SEL_SS = 0.
TCLK supplied on the XTALIN pin in Test Mode.
0
0
1
1
1
0
0
1
1
1
0
0
1
1
1
0
0
1
1
1
X
0
1
0
1
PCI_STOP
0
1
0
1
1
0
1
0
1
1
0
1
0
1
1
0
1
0
1
1
66.67
100
48.0
Target Frequency
N/A
N/A
N/A
0 (downspread) 2
1 (no spread)
N/A
N/A
N/A
0 (downspread) 3
1 (no spread)
N/A
N/A
N/A
0 (downspread) 2
1 (no spread)
N/A
N/A
N/A
0 (downspread) 3
1 (no spread)
(MHz)
SEL_SS
SEL_SS
0
1
1
1
1
PWR_DWN
[2]
[2]
66.654
99.77
48.008
Actual Frequency
2
2
2
2
3
3
3
2
2
2
2
3
3
3
3
CPU/PCI
3
CPU/PCI
Low
Low
Low
Running
Running
Ratio
Ratio
(MHz)
CPUCLK
Hi-Z
Reserved
Reserved
66.66 MHz 33.33 MHz
66.66 MHz 33.33 MHz
TCLK/2
Reserved
Reserved
100 MHz
100 MHz
Hi-Z
Reserved
Reserved
66.66 MHz 33.33 MHz
66.66 MHz 33.33 MHz
TCLK/2
Reserved
Reserved
100 MHz
100 MHz
CPUCLK
CPUCLK
–195
–2346
167
Low
Low
Running
Low
Running
PPM
PCICLK
Hi-Z
Reserved
Reserved
TCLK/6
Reserved
Reserved
33.33 MHz
33.33 MHz
Hi-Z
Reserved
Reserved
TCLK/6
Reserved
Reserved
33.33 MHz
33.33 MHz
PCICLK_F
PCICLK_F
PCICLK
PCICLK
Low
Running
Running
Running
Running
PCICLK_F
Hi-Z
14.318 MHz
14.318 MHz
14.318 MHz
14.318 MHz
TCLK
14.318 MHz
14.318 MHz
14.318 MHz
14.318 MHz
Hi-Z
14.318 MHz
14.318 MHz
14.318 MHz
14.318 MHz
TCLK
14.318 MHz
14.318 MHz
14.318 MHz
14.318 MHz
REF
REF
[3]
[3]
Low
Running
Running
Running
Running
Clocks
Other
Hi-Z
14.318 MHz
14.318 MHz
14.318 MHz
14.318 MHz
TCLK
14.318 MHz
14.318 MHz
14.318 MHz
14.318 MHz
Hi-Z
Reserved
Reserved
16.67 MHz
16.67 MHz
TCLK/12
Reserved
Reserved
16.67 MHz
16.67 MHz
APIC
APIC
[3]
Off
Running Running
Running Running
Running Running
Running Running
[3]
Osc.
CY2280
Page 3 of 12
Hi-Z
48 MHz
48 MHz
48 MHz
48 MHz
TCLK/2
48 MHz
48 MHz
48 MHz
48 MHz
Hi-Z
48 MHz
48 MHz
48 MHz
48 MHz
TCLK/2
48 MHz
48 MHz
48 MHz
48 MHz
USBCLK
USBCLK
Off
PLLs