CY28347
Universal Single-chip Clock Solution
for VIA P4M266/KM266 DDR Systems
Table 1. Frequency Selection Table
Features
FS(3:0)
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
CPU
AGP
66.80
66.80
60.00
66.67
72.00
70.00
64.00
70.00
77.00
73.33
60.00
60.00
60.00
66.67
66.67
66.67
PCI
• Supports VIA P4M266/KM266 chipsets
• Supports Pentium® 4, Athlon¥ processors
• Supports two DDR DIMMS
66.80
33.40
33.40
30.00
33.33
36.00
35.00
32.00
35.00
38.50
36.67
30.00
30.00
30.00
33.33
33.33
33.33
100.20
120.00
133.33
72.00
• Provides
— Two different programmable CPU clock pairs
— Six differential DDR SDRAM pairs
— Two low-skew/low-jitter AGP clocks
— Six low-skew/low-jitter PCI clocks
— One 48M output for USB
105.00
160.00
140.00
77.00
110.00
180.00
150.00
90.00
— One programmable 24M or 48M for SIO
• Dial-a-Frequency¥ and Dial-a-dB¥ features
• SpreadSpectrumforbestelectromagneticinterference
(EMI) reduction
100.00
200.00
133.33
• SMBus-compatible for programmability
• 56-pin SSOP and TSSOP packages
Pin Configuration[1]
Block Diagram
VDDR
1
2
3
4
5
6
7
8
56
*FS0/REF0
VSSR
XIN
XOUT
VDDAGP
VTTPWRGD#/REF1
VDDR
VSSC
CPUT/CPUOD_T
CPUC/CPUOD_C
VDDC
XIN
REF(0:1)
XTAL
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
XOUT
REF0
VDDI
CPUCS_T
CPUCS_C
*MODE/AGP0
*SELP4_K7#/AGP1
*PCI_STP#
VSSAGP
**FS1/PCI_F
PCI1
*MULTSEL/PCI2
VSSPCI
PCI3
FS0
VDDC
SELP4_K7#
CPUT/CPU0D_T
CPUC/CPU0D_C
VDDI
PCI_STP#
CPU_STP#
PD#
PLL1
CPUCS_C
CPUCS_T
VSSI
9
VDDPCI
FS2
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
PCI(3:5)
PCI_F
MULTSEL
PCI2
FS3 FS1
FBOUT
BUF_IN
DDRT0
DDRC0
DDRT1
DDRC1
VDDD
PCI4
VDDPCI
PCI5
PCI1
VDDAGP
AGP(0:1)
*CPU_STP#
VSSD
VSS48M
**FS3/48M
**FS2/24_48M
VDD48M
VDD
DDRT2
DDRC2
DDRT3
DDRC3
VDDD
VDD48M
48M
SDATA
SCLK
SMBus
PLL2
/ 2
24_48M
VSS
IREF
*PD#
SCLK
SDATA
VSSD
DDRT4
DDRC4
DDRT5
DDRC5
SELSDR_DDR#
VDDD
FBOUT
S2D
CONVERT
DDRT(0:5)
DDRC(0:5)
BUF_IN
Note:
1. Pins marked with [*] have internal pull-up resistors. Pins marked with [**] have internal pull-down resistors.
Rev 1.0, November 20, 2006
Page 1 of 21
2200 Laurelwood Road, Santa Clara, CA 95054
Tel:(408) 855-0555 Fax:(408) 855-0550
www.SpectraLinear.com
SPECTRALINEAR [ SPECTRALINEAR INC ]
