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CY28551
......................Document #: 001-05675 Rev. *C Page 8 of 28
Byte 5: Control Register 5
Bit
@Pup
Type
Name
Description
7
0
R/W
CPU_SS1
CPU (PLL1) Spread Spectrum Selection
00: –0.5% (peak to peak)
01: ±0.25% (peak to peak)
10: –1.0% (peak to peak)
11: ±0.5% (peak to peak)
60
R/W
CPU_SS0
5
0
R/W
CPU_SS_OFF
PLL1 (CPUPLL) Spread Spectrum Enable
0 = Spread off, 1 = Spread on
4
0
R/W
PCIE_SS0
PLL2 (PCIEPLL) Spread Spectrum Selection
0: –0.5% (peak to peak)
0: –1.0% (peak to peak)
3
0
R/W
PCIE_SS_OFF
PLL2 (PCIEPLL) Spread Spectrum Enable
0 = SRC spread off, 1 = SRC spread on
2
0
R/W
SATA_SS_OFF
PLL3 (SATAPLL) Spread Spectrum Enable
0 = Spread off, 1 = Spread on
1
HW
R/W
SEL24_48
24M/48 MHz output selection
0 = 48 MHz, 1 = 24 MHz
0
1
R/W
Reserved
Byte 6: Control Register 6
Bit
@Pup
Type
Name
Description
7
0
R/W
SW_RESET
Software Reset.
When set, the device asserts a reset signal on SRESET# upon completion
of the block/word/byte write that set it. After asserting and deasserting the
SRESET# this bit will self clear (set to 0).
6
0
R/W
Reserved
5
0
R/W
FIX_LINK_PCI
LINK and PCI clock source selection
0 = PLL2(SRCPLL), 1 = PLL (SATAPLL)
4
HW
R
FSD
FSD Reflects the value of the FSD pin sampled on power up. 0 = FSD was
low during VTT_PWRGD# assertion.
3
HW
R
FSC
FSC Reflects the value of the FSC pin sampled on power up. 0 = FSC was
low during VTT_PWRGD# assertion.
2
HW
R
FSB
FSB Reflects the value of the FSB pin sampled on power up. 0 = FSB was
LOW during VTT_PWRGD# assertion
1
HW
R
FSA
FSA Reflects the value of the FSA pin sampled on power up. 0 = FSA was
LOW during VTT_PWRGD# assertion
0
HW
R
POWERGOOD
Power Status bit:
0 = Internal power or Internal resets are NOT valid
1 = Internal power and Internal resets are valid
Read only Bit 7 sets to 0 when Bit 7 = 0
Byte 7: Vendor ID
Bit
@Pup
Type
Name
Description
7
0
R
Revision Code Bit 3 Revision Code Bit 3
6
0
R
Revision Code Bit 2 Revision Code Bit 2
5
1
R
Revision Code Bit 1 Revision Code Bit 1
4
0
R
Revision Code Bit 0 Revision Code Bit 0
3
1
R
Vendor ID Bit 3
2
0
R
Vendor ID Bit 2
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