CY28341-3 Datasheet, PDF (1/19 Pages) SpectraLinear Inc – Universal Clock Chip for VIA™P4M/KT/KM400A DDR Systems

PRELIMINARY
CY28341-3
Universal Clock Chip for VIA™P4M/KT/KM400A DDR Systems
Features
Table 1. Frequency Selection Table
• Supports VIA P4M/KM/KT/266/333/400A chipsets
• Supports Intel^ Pentium^ 4, Athlon™ processors
• Supports two DDR DIMMS
• Provides:
FS(3:0)
CPU
AGP
PCI
0000
100.9
67.3
33.6
0001
100.0
66.7
33.3
0010
133.9
66.9
33.5
0011
133.3
66.7
33.3
— 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
0100
110.0
73.3
36.7
0101
145.2
72.6
36.3
0110
180.0
72.0
36.0
0111
198.4
71.7
35.8
1000
200.9
66.9
33.5
1001
200.0
66.7
33.3
1010
166.9
66.8
33.4
1011
166.6
66.6
33.3
1100
100.0
66.7
33.3
1101
133.3
66.7
33.3
1110
200.0
66.7
33.3
1111
166.6
66.6
33.3
Block Diagram
Pin Configuration^[1]
XIN
XOUT
PD#
SDATA
SCLK
XTAL
FS0
PLL1
FS2
FS3 FS1
SMBus
PLL2
WDEN
VDDR
REF0
SELP4_K7#
REF(0:1)
VDDI
CPUCS_T/C
VDDC
CPU(0:1)/CPU0D_T/C
VDDPCI
PCI(3:6)
PCI_F
MULTSEL
PCI2
PCI1
VDDAGP
AGP(0:2)
VDD48M
48M
/2
24_48M
WD
Buf_IN
S2D
CONVERT
SRESET#
VDDD
FBOUT
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
56
2
55
3
54
4
53
5
52
6
51
7
50
8
49
9
48
10
47
11
46
12
45
13
44
14
43
15
42
16
41
17
40
18
39
19
38
20
37
21
36
22
35
23
34
24
33
25
32
26
31
27
30
28
29
56 pin SSOP
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
Note:
1. Pins marked with [*] have internal 250 KΩ pull-up resistors. Pins marked with [**] have internal 250 KΩ pull-down resistors.
Cypress Semiconductor Corporation • 3901 North First Street • San Jose, CA 95134 • 408-943-2600
Document #: 38-07580 Rev. **
Revised October 3, 2003