CY24239 Cypress Semiconductor, CY24239 Datasheet - Page 8

• Manufacturer Part Number: CY24239
• Description: Spread Spectrum Frequency Timing Generator
• Manufacturer: Cypress Semiconductor

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Table 6. Additional Frequency Selections through Serial Data Interface Data Bytes
Table 7. Select Function for Data Byte 0, Bits 0
Note:
Document #: 38-07038 Rev. **
2.
Normal Operation
Three-state
SEL_3
CPU and PCI frequency selections are listed in Table 2 and Table 6.
Bit 2
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
Function
Data Byte 0, Bit 3 = 1
SEL_2
Bit 6
Input Conditions
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
Input Conditions
Data Byte 0
SEL_1
Bit 0
Bit 5
0
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
SEL_0
Bit 4
CPU_F, 1:2
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
Note 2
Hi-Z
CPU, SDRAM
Clocks (MHz)
91.66
100.0
105.0
110.0
133.3
91.66
100.0
91.66
100.0
75.0
83.3
66.6
75.0
83.3
75.0
83.3
PCI0:5
PCI_F,
Note 2
Output Frequency
Hi-Z
Output Conditions
IOAPIC0,_F
14.318 MHz
REF0:1,
PCI Clocks
Hi-Z
(MHz)
27.76
27.76
27.76
30.5
25.0
33.3
33.3
26.3
27.5
33.3
30.5
25.0
33.3
30.5
25.0
33.3
48 MHz
48MHZ
Hi-Z
Spread Spectrum
Percentage
–1.2%
–1.2%
–1.2%
–1.2%
–2.4%
–2.4%
–2.4%
–2.4%
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
CY24239
Page 8 of 15
24 MHz
24MHZ
Hi-Z