CY28347 Datasheet, PDF (1/22 Pages) Cypress Semiconductor – Universal Single-chip Clock Solution for VIA P4M266/KM266 DDR Systems

CY28347
Universal Single-chip Clock Solution
for VIA P4M266/KM266 DDR Systems
Features
• Supports VIA P4M266/KM266 chipsets
• Supports Pentium^® 4, Athlon processors
• Supports two DDR DIMMS
• 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
— One programmable 24M or 48M for SIO
• Dial-a-Frequency and Dial-a-dB features
• Spread Spectrum for best electromagnetic interference
(EMI) reduction
• 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
66.80
100.20
120.00
133.33
72.00
105.00
160.00
140.00
77.00
110.00
180.00
150.00
90.00
100.00
200.00
133.33
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
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
Block Diagram
Pin Configuration^[1]
XIN
XOUT
PCI_STP#
CPU_STP#
PD#
SDATA
SCLK
XTAL
FS0
PLL1
FS2
FS3 FS1
SMBus
PLL2
VDDR
REF0
SELP4_K7#
/2
REF(0:1)
VDDI
CPUCS_T
CPUCS_C
VDDC
CPUT/CPU0D_T
CPUC/CPU0D_C
VDDPCI
PCI(3:5)
PCI_F
MULTSEL
PCI2
PCI1
VDDAGP
AGP(0:1)
VDD48M
48M
24_48M
BUF_IN
SELSDR_DDR#
S2D
CONVERT
VDDD
FBOUT
DDRT(0:5)
DDRC(0:5)
*FS0/REF0 1
VSSR 2
XIN
3
XOUT 4
VDDAGP 5
*MODE/AGP0 6
*SELP4_K7#/AGP1 7
*PCI_STP# 8
VSSAGP 9
**FS1/PCI_F 10
PCI1 11
*MULTSEL/PCI2 12
VSSPCI 13
PCI3 14
PCI4 15
VDDPCI 16
PCI5 17
*CPU_STP# 18
VSS48M 19
**FS3/48M 20
**FS2/24_48M 21
VDD48M 22
VDD 23
VSS 24
IREF 25
*PD# 26
SCLK 27
SDATA 28
56 _{VTTPWRGD#/REF1}
55 VDDR
54 VSSC
53 CPUT/CPUOD_T
52 CPUC/CPUOD_C
51 VDDC
50 VDDI
49 CPUCS_C
48 CPUCS_T
47 VSSI
46 FBOUT
45 BUF_IN
44 DDRT0
43 DDRC0
42 DDRT1
41 DDRC1
40 VDDD
39 VSSD
38 DDRT2
37 DDRC2
36 DDRT3
35 DDRC3
34 VDDD
33 VSSD
32 DDRT4
31 DDRC4
30 DDRT5
29 DDRC5
Note:
1. Pins marked with [*] have internal pull-up resistors. Pins marked with [**] have internal pull-down resistors.
Cypress Semiconductor Corporation • 3901 North First Street • San Jose, CA 95134 • 408-943-2600
Document #: 38-07352 Rev. *C
Revised December 26, 2002