CY28341-3
Universal Clock Chip for VIA™P4M/KT/KM400A DDR Systems
Features
Table 1. Frequency Selection Table
FS(3:0)
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
CPU
100.9
100.0
133.9
133.3
110.0
145.2
180.0
198.4
200.9
200.0
166.9
166.6
100.0
133.3
200.0
166.6
AGP
67.3
66.7
66.9
66.7
73.3
72.6
72.0
71.7
66.9
66.7
66.8
66.6
66.7
66.7
66.7
66.6
PCI
33.6
33.3
33.5
33.3
36.7
36.3
36.0
35.8
33.5
33.3
33.4
33.3
33.3
33.3
33.3
33.3
• Supports VIA P4M/KM/KT/266/333/400A chipsets
• Supports Intel£ Pentium£ 4, Athlon™ processors
• Supports two DDR DIMMS
• Provides:
— Two different programmable CPU clock pairs
— Six differential DDR pairs
— Three low-skew/-jitter AGP clocks
— Seven low-skew/-jitter PCI clocks
— One 48M output for USB
— One programmable 24M or 48M for SIO
• Dial-A-Frequency£ and Dial-A-dB¥ features
• Spread Spectrum for best EMI reduction
• Watchdog feature for system recovery
• SMBus-compatible for programmability
• 56-pin SSOP and TSSOP packages
Pin Configuration[1]
Block Diagram
VDDR
XIN
REF(0:1)
VDDI
XTAL
FS2
1
2
3
4
5
6
7
8
56
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
*FS0/REF0
VSSR
VTTPWRGD#/REF1
VDDR
VSSC
CPUT/CPUOD_T
CPUC/CPUOD_C
VDDC
XOUT
REF0
XIN
XOUT
VDDAGP
AGP0
*SELP4_K7/AGP1
AGP2
VSSAGP
**FS1/PCI_F
PCI1
*MULTSEL/PCI2
VSSPCI
PCI3
CPUCS_T/C
FS0
VDDC
SELP4_K7#
CPU(0:1)/CPU0D_T/C
PLL1
VDDI
CPUCS_C
CPUCS_T
VSSI
VDDPCI
9
PCI(3:6)
FS3 FS1
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
FBOUT
PCI_F
MULTSEL
PCI2
BUF_IN
DDRT0
DDRC0
DDRT1
DDRC1
VDDD
PD#
PCI1
PCI4
VDDPCI
PCI5
VDDAGP
AGP(0:2)
PCI6
VSSD
VDD48M
48M
VSS48M
**FS3/48M
**FS2/24_48M
VDD48M
VDD
DDRT2
DDRC2
DDRT3
DDRC3
VDDD
SDATA
SCLK
SMBus
PLL2
/ 2
WDEN
24_48M
VSS
VSSD
IREF
*PD#/SRESET#
SCLK
DDRT4
DDRC4
DDRT5
DDRC5
SRESET#
VDDD
WD
SDATA
FBOUT
S2D
Buf_IN
56 pin SSOP
DDRT(0:5)
DDRC(0:5)
CONVERT
Note:
1. Pins marked with [*] have internal 250 K:ꢀpull-up resistors. Pins marked with [**] have internal 250 K:ꢀpull-down resistors.
Rev 1.0, November 21, 2006
Page 1 of 19
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www.SpectraLinear.com
SPECTRALINEAR [ SPECTRALINEAR INC ]
