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CY28341-2 Datasheet

  • CY28341-2

  • Universal Clock Chip for VIA P4M/KT/KM400 DDR Systems

  • 19頁

  • CYPRESS

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CY28341-2
Universal Clock Chip for VIA鈩4M/KT/KM400
DDR Systems
Features
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Supports VIA錚?P4M/KM/KT/266/333/400 chipsets
Supports Pentium
廬
4, Athlon鈩?processors
Supports two DDR DIMMS
Supports three SDRAM DIMMS at 100 MHz
Provides:
鈥?two different programmable CPU clock pairs
鈥?six differential SDRAM DDR pairs
鈥?three low-skew/-jitter AGP clocks
鈥?seven low-skew/-jitter PCI clocks
鈥?one 48M output for USB
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?one programmable 24M or 48M for SIO
Dial-a-Frequency
錚?/div>
and Dial-a-dB錚?features
Spread Spectrum for best electromagnetic interference
(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
66.80
100.00
120.00
133.33
72.00
105.00
160.00
140.00
77.00
110.00
180.00
166.6
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
66.6
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
33.3
30.00
33.33
33.33
33.33
Block Diagram
XIN
XOUT
XTAL
REF0
VDDR
REF(0:1)
VDDI
CPUCS_T/C
FS0
Pin Configuration
[1]
*FS0/REF0
VSSR
XIN
XOUT
VDDAGP
AGP0
*SELP4_K7/AGP1
AGP2
VSSAGP
**FS1/PCI_F
**SELSDR_DDR/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/SDRAM0
DDRC0/SDRAM1
DDRT1/SDRAM2
DDRC1/SDRAM3
VDDD
VSSD
DDRT2/SDRAM4
DDRC2/SDRAM5
DDRT3/SDRAM6
DDRC3/SDRAM7
VDDD
VSSD
DDRT4/SDRAM8
DDRC4/SDRAM9
DDRT5/SDRAM10
DDRC5/SDRAM11
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
CY28341-2
PD#
SDATA
SCLK
SMBus
PLL2
WDEN
24_48M
WD
SELSDR_DDR
Buf_IN
S2D
CONVERT
SRESET#
VDDD
FBOUT
DDRT(0:5)/SDRAM(0,2,4,6,8,10)
DDRC(0:5)/SDRAM(1,3,5,7,9,11)
56 pin SSOP
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
鈥?/div>
3901 North First Street
鈥?/div>
San Jose
,
CA 95134
鈥?/div>
408-943-2600
Revised April 22, 2003

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