CY28341-2 Datasheet, PDF (1/19 Pages) Cypress Semiconductor – Universal Clock Chip for VIA P4M/KT/KM400 DDR Systems

CY28341-2
Universal Clock Chip for VIA™P4M/KT/KM400
DDR Systems
Features
• 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:
— 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
— 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 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
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
SELSDR_DDR
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)
*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 #: 38-07471 Rev. *B
Revised April 22, 2003