CY28341 Datasheet, PDF (1/21 Pages) Cypress Semiconductor – Universal Single-Chip Clock Solution for VIA P4M266/KM266 DDR Systems

CY28341
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
• Supports three SDRAMS DIMMS at 100 MHz
• Provides:
— Two different programmable CPU clock pairs
— Six differential SDRAM DDR pairs
— Three low-skew/low-jitter AGP clocks
— Seven 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
• Watchdog feature for systems recovery
• SMBus-compatible for programmability
• 56-pin SSOP and TSSOP packages
Block Diagram
Table 1. Frequency Selection Table
FS(3:0)
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1100
1111
CPU
66.80
100.00
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
Pin Configuration^[1]
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
XIN
XOUT
PD#
XTAL
FS0
PLL1
FS2
FS3 FS1
VDDR
REF0
SELP4_K7#
SDATA
SCLK
SMBus
PLL2
/2
WDEN
WD
Buf_IN
SELSDR_DDR
S2D
CONVERT
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
24_48M
SRESET#
VDDD
FBOUT
DDRT(0:5)/SDRAM(0,2,4,6,8,10)
DDRC(0:5)/SDRAM(1,3,5,7,9,11)
*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
56 _{VTTPWRGD#/REF1}
2
55 VDDR
3
54 VSSC
4
53 CPUT/CPUOD_T
5
52 CPUC/CPUOD_C
6
51 VDDC
7
50 VDDI
8
49 CPUCS_C
9
48 CPUCS_T
10
47 VSSI
11
46 FBOUT
12
45 _{BUF_IN}
13
44 _DDRT0/SDRAM0
14
43 DDRC0/SDRAM1
15
42 DDRT1/SDRAM2
16
41 DDRC1/SDRAM3
17
40 VDDD
18
39 VSSD
19
38 DDRT2/SDRAM4
20
37 DDRC2/SDRAM5
21
36 DDRT3/SDRAM6
22
35 DDRC3/SDRAM7
23
34 VDDD
24
33 VSSD
25
32 DDRT4/SDRAM8
26
31 DDRC4/SDRAM9
27
30 DDRT5/SDRAM10
28
29 DDRC5/SDRAM11
56 pin SSOP
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 #: 38-07367 Rev. *A
Revised December 26, 2002