CY28323 Datasheet, PDF (1/22 Pages) Cypress Semiconductor – FTG for Intel® Pentium® 4 CPU and Chipsets

PRELIMINARY
CY28323
FTG for Intel^® Pentium^® 4 CPU and Chipsets
Features
• Compatible to Intel^® CK-Titan & CK-408 Clock Synthe-
sizer/Driver Specifications
• System frequency synthesizer for Intel Brookdale 845
and Brookdale - G Pentium^® 4 Chipsets
• Programmable clock output frequency with less than
1 MHz increment
• Integrated fail-safe Watchdog timer for system recov-
ery
• Automatically switch to HW selected or SW pro-
grammed clock frequency when watchdog timer
time-out
• Capable of generating system RESET after a Watchdog
timer time-out occurs or a change in output frequency
via SMBus interface
• Support SMBus byte read/write and block read/ write
operations to simplify system BIOS development
• Vendor ID and Revision ID support
• Programmable drive strength support
• Programmable output skew support
• Power management control inputs
• Available in 48-pin SSOP
CPU 3V66
PCI
REF
48M 24_48M
x3
x4
x 10
x2
x1
x1
Block Diagram
X1
X2
*FS0:4
VTT_PWRGD#
*MULTSEL0:1
XTAL
OSC
PLL Ref Freq
PLL 1
Divider
Network
PWR_DWN#
PLL2
2
SDATA
SCLK
SMBus
Logic
VDD_REF
REF0:1
Pin Configuration^[[1]]
*MULTSEL1/REF1
VDD_CPU
CPU0:1, CPU0:1#,
VDD_REF
CPU_ITP, CPU_ITP#
X1
X2
GND_PCI
*FS2/PCI_F0
*FS3/PCI_F1
PCI_F2
VDD_PCI
VDD_3V66
*FS4/PCI0
3V66_0:3
PCI1
PCI2
VDD_PCI
PCI_F0:2
GND_PCI
PCI3
PCI4
PCI0:6
PCI5
PCI6
VDD_PCI
VDD_48MHz
VTT_PWRGD#
48MHz
RST#
GND_48MHz
24_48MHz
*FS0/48MHz
*FS1/24_48MHz
VDD_48MHz
RST#
1
48
2
47
3
46
4
45
5
44
6
43
7
42
8
41
9
40
10
39
11
38
12
37
13
36
14
35
15
34
16
33
17
32
18
31
19
30
20
29
21
28
22
27
23
26
24
25
SSOP-48
REF0/MULTSEL0*
GND_REF
VDD_CPU
CPU_ITP
CPU_ITP#
GND_CPU
PWR_DWN#
CPU0
CPU0#
VDD_CPU
CPU1
CPU1#
GND_CPU
IREF
VDD_CORE
GND_CORE
VDD_3V66
3V66_0
3V66_1
GND_3V66
3V66_2
3V66_3
SCLK
SDATA
Intel and Pentium are registered trademarks of Intel Corporation
Note:
1. Signals marked with ‘*’ and “^” has internal pull-up and pull-down resistors respectively.
Cypress Semiconductor Corporation • 3901 North First Street • San Jose • CA 95134 • 408-943-2600
Document #: 38-07004 Rev. *B
Revised December 14, 2002