CY28341-2
Universal Clock Chip for VIA™P4M/KT/KM400
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
66.80
AGP
66.80
66.80
60.00
66.67
72.00
70.00
64.00
70.00
77.00
73.33
60.00
66.6
PCI
• Supports VIA P4M/KM/KT/266/333/400 chipsets
• Supports Pentium® 4, Athlon™ processors
• Supports two DDR DIMMS
• Supports three SDRAM DIMMS at 100 MHz
• Provides:
33.40
33.40
30.00
33.33
36.00
35.00
32.00
35.00
38.50
36.67
30.00
33.3
100.00
120.00
133.33
72.00
105.00
160.00
140.00
77.00
— two different programmable CPU clock pairs
— six differential SDRAM DDR pairs
— three low-skew/-jitter AGP clocks
— seven low-skew/-jitter PCI clocks
— one 48M output for USB
110.00
180.00
166.6
— one programmable 24M or 48M for SIO
• Dial-a-Frequency and Dial-a-dB features
• SpreadSpectrumforbestelectromagneticinterference
(EMI) reduction
• Watchdog feature for system recovery
• SMBus-compatible for programmability
• 56-pin SSOP and TSSOP packages
90.00
60.00
66.67
66.67
66.67
30.00
33.33
33.33
33.33
100.00
200.00
133.33
Pin Configuration[1]
Block Diagram
VDDR
XIN
XOUT
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
VDDI
CPUCS_C
CPUCS_T
VSSI
FBOUT
REF(0:1)
VDDI
XTAL
FS2
REF0
XIN
XOUT
VDDAGP
AGP0
*SELP4_K7/AGP1
AGP2
VSSAGP
**FS1/PCI_F
**SELSDR_DDR/PCI1
CPUCS_T/C
FS0
VDDC
SELP4_K7#
CPU(0:1)/CPU0D_T/C
PLL1
9
VDDPCI
PCI(3:6)
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
FS3 FS1
*MULTSEL/PCI2
VSSPCI
PCI3
BUF_IN
PCI_F
MULTSEL
DDRT0/SDRAM0
DDRC0/SDRAM1
DDRT1/SDRAM2
DDRC1/SDRAM3
VDDD
PD#
PCI2
PCI4
VDDPCI
PCI5
PCI1
VDDAGP
AGP(0:2)
PCI6
VSSD
VSS48M
**FS3/48M
**FS2/24_48M
VDD48M
VDD
VSS
IREF
*PD#/SRESET#
SCLK
DDRT2/SDRAM4
DDRC2/SDRAM5
DDRT3/SDRAM6
DDRC3/SDRAM7
VDDD
VDD48M
48M
SDATA
SCLK
SMBus
PLL2
/ 2
WDEN
VSSD
24_48M
DDRT4/SDRAM8
DDRC4/SDRAM9
DDRT5/SDRAM10
DDRC5/SDRAM11
SRESET#
VDDD
WD
SDATA
SELSDR_DDR
FBOUT
S2D
56 pin SSOP
DDRT(0:5)/SDRAM(0,2,4,6,8,10)
DDRC(0:5)/SDRAM(1,3,5,7,9,11)
Buf_IN
CONVERT
Note:
1. Pins marked with [*] have internal pull-up resistors. Pins marked with [**] have internal pull-down resistors.
Cypress Semiconductor Corporation
Document #: 38-07471 Rev. *B
•
3901 North First Street
•
San Jose, CA 95134
•
408-943-2600
Revised April 22, 2003