CY2280
Function Table (-11S Option)
CPU/PCI
Ratio
PCICLK_F
PCICLK
SEL100 SEL1 SEL0
SEL_SS[2]
CPUCLK
Hi-Z
REF
APIC
USBCLK
Hi-Z
0
0
0
0
0
1
1
1
1
1
0
0
1
1
1
0
0
1
1
1
0
1
0
1
1
0
1
0
1
1
N/A
2
Hi-Z
Hi-Z
Hi-Z
N/A
2
2
2
2
3
3
3
3
3
Reserved Reserved
Reserved Reserved
66.66 MHz 33.33 MHz
66.66 MHz 33.33 MHz
14.318 MHz 14.318 MHz
14.318 MHz 14.318 MHz
14.318 MHz 14.318 MHz
14.318 MHz 14.318 MHz
48 MHz
48 MHz
48 MHz
48 MHz
TCLK/2
48 MHz
48 MHz
48 MHz
48 MHz
N/A
0 (downspread)
1 (no spread)
N/A
TCLK/2
TCLK/6
TCLK[3]
TCLK[3]
N/A
Reserved Reserved
Reserved Reserved
14.318 MHz 14.318 MHz
14.318 MHz 14.318 MHz
14.318 MHz 14.318 MHz
14.318 MHz 14.318 MHz
N/A
0 (downspread)
1 (no spread)
100 MHz
100 MHz
33.33 MHz
33.33 MHz
Function Table (-21S Option)
CPU/PCI
Ratio
PCICLK_F
PCICLK
SEL100 SEL1 SEL0
SEL_SS[2]
CPUCLK
REF
APIC
USBCLK
Hi-Z
0
0
0
0
0
1
1
1
1
1
0
0
1
1
1
0
0
1
1
1
0
1
0
1
1
0
1
0
1
1
N/A
2
2
2
2
2
3
3
3
3
3
Hi-Z
Hi-Z
Hi-Z
Hi-Z
N/A
Reserved Reserved
Reserved Reserved
66.66 MHz 33.33 MHz
66.66 MHz 33.33 MHz
14.318 MHz Reserved
14.318 MHz Reserved
14.318 MHz 16.67 MHz
14.318 MHz 16.67 MHz
48 MHz
48 MHz
48 MHz
48 MHz
TCLK/2
48 MHz
48 MHz
48 MHz
48 MHz
N/A
0 (downspread)
1 (no spread)
N/A
TCLK/2
TCLK/6
TCLK[3]
TCLK/12[3]
N/A
Reserved Reserved
Reserved Reserved
14.318 MHz Reserved
14.318 MHz Reserved
14.318 MHz 16.67 MHz
14.318 MHz 16.67 MHz
N/A
0 (downspread)
1 (no spread)
100 MHz
100 MHz
33.33 MHz
33.33 MHz
Actual Clock Frequency Values
Target Frequency Actual Frequency
(MHz)
Clock Output
CPUCLK
(MHz)
PPM
–195
66.67
100
66.654
99.77
CPUCLK
USBCLK
–2346
167
48.0
48.008
Power Management Logic
Other
PCICLK_F Clocks
CPU_STOP PCI_STOP
PWR_DWN
CPUCLK
PCICLK
Osc.
Off
PLLs
Off
X
X
0
1
0
1
0
1
1
1
1
Low
Low
Low
Low
0
0
1
Low
Low
Running
Running
Running
Running
Running Running Running
Running Running Running
Running Running Running
Running Running Running
Low
Running
Low
Running
Running
1
Running
Notes:
2. Target frequency is modulated by percentage shown (max.) when SEL_SS = 0.
3. TCLK supplied on the XTALIN pin in Test Mode.
Rev 1.0,November 25, 2006
Page 3 of 11
SPECTRALINEAR [ SPECTRALINEAR INC ]
