CY28341-3
Universal Clock Chip for VIA™P4M/KT/KM400A DDR Systems
Features
• 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
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
Block Diagram
XIN
XOUT
XTAL
REF0
VDDR
REF(0:1)
VDDI
CPUCS_T/C
FS0
Pin Configuration
[1]
SELP4_K7#
VDDC
CPU(0:1)/CPU0D_T/C
VDDPCI
FS2
PLL1
FS3 FS1
PCI(3:6)
PCI_F
MULTSEL
PCI2
PCI1
VDDAGP
AGP(0:2)
VDD48M
48M
/2
PD#
SDATA
SCLK
SMBus
PLL2
WDEN
24_48M
WD
SRESET#
VDDD
FBOUT
S2D
CONVERT
DDRT(0:5)
DDRC(0:5)
*FS0/REF0
VSSR
XIN
XOUT
VDDAGP
AGP0
*SELP4_K7/AGP1
AGP2
VSSAGP
**FS1/PCI_F
PCI1
*MULTSEL/PCI2
VSSPCI
PCI3
PCI4
VDDPCI
PCI5
PCI6
VSS48M
**FS3/48M
**FS2/24_48M
VDD48M
VDD
VSS
IREF
*PD#/SRESET#
SCLK
SDATA
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
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
VTTPWRGD#/REF1
VDDR
VSSC
CPUT/CPUOD_T
CPUC/CPUOD_C
VDDC
VDDI
CPUCS_C
CPUCS_T
VSSI
FBOUT
BUF_IN
DDRT0
DDRC0
DDRT1
DDRC1
VDDD
VSSD
DDRT2
DDRC2
DDRT3
DDRC3
VDDD
VSSD
DDRT4
DDRC4
DDRT5
DDRC5
CY28341-3
Buf_IN
56 pin SSOP
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
2200 Laurelwood Road, Santa Clara, CA 95054
Tel:(408) 855-0555
Fax:(408) 855-0550
Page 1 of 19
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