CY28316 Datasheet, PDF (1/17 Pages) Cypress Semiconductor – FTG for VIA PL133T and PLE133T

CY28316
FTG for VIA PL133T and PLE133T
Features
• Single-chip system frequency synthesizer for VIA
PL133T and PLE133T chipsets
• Programmable clock output frequency with less than
1 MHz increment
• Integrated fail-safe Watchdog Timer for system
recovery
• Automatically switches to HW-selected or
SW-programmed clock frequency when Watchdog
Timer time-out occurs
• Capable of generating system RESET after a Watchdog
Timer time-out occurs or a change in output frequency
via SMBus interface
• Supports SMBus byte Read/Write and block Read/Write
operations to simplify system BIOS development
• Vendor ID and Revision ID support
• Programmable drive strength for SDRAM and PCI
output clocks
• Programmable output skew for CPU, PCI, and SDRAM
• Maximized electromagnetic interference (EMI)
suppression using Cypress’s Spread Spectrum
technology
• Available in 48-pin SSOP
Key Specifications
CPU to CPU Output Skew: ......................................... 175 ps
PCI to PCI Output Skew: ............................................ 500 ps
Block Diagram
Pin Configuration^[1]
VDD_REF
REF0
X1
XTAL
REF1/FS2*
X2
OSC
PLL Ref Freq
VTTPWRGD#
PLL 1
÷2,3,4
CPU0:1
VDD_PCI
PCI0/FS4*
PCI1/FS3*
PCI2:6
SDATA
SCLK
SMBus
Logic
PLL2
SDRAMIN
Reset
Logic
÷2
RST#
VDD_48MHz
48MHz/FS0*
24_48MHz/FS1*
VDD_SDRAM
SDRAM0:12
13
VDD_REF 1
GND_REF 2
X1 3
X2 4
VDD_PCI 5
*FS4/PCI0 6
*FS3/PCI1 7
GND_PCI 8
PCI2 9
PCI3 10
PCI4 11
PCI5 12
PCI6 13
VDD_PCI 14
SDRAMIN 15
GND_SDRAM 16
SDRAM11 17
SDRAM10 18
VDD_SDRAM 19
SDRAM9 20
SDRAM8 21
GND_SDRAM 22
{ ^SDATA
SMBus _SCLK
23
24
48 VTT_PWRGD#
47 REF0
46 REF1/FS2*
45 GND_CPU
44 CPU0
43 CPU1
42 VDD_CPU
41 RST#
40 SDRAM_12
39 GND_SDRAM
38 SDRAM0
37 SDRAM1
36 VDD_SDRAM
35 SDRAM2
34 SDRAM3
33 GND_SDRAM
32 SDRAM4
31 SDRAM5
30 VDD_SDRAM
29 SDRAM6
28 SDRAM7
27 VDD_48MHz
26 48MHz/FS0*
25 24_48MHz/FS1*
Note:
1. Signals marked with ‘*’ have internal pull-up resistors.
Rev 1.0, November 20, 2006
2200 Laurelwood Road, Santa Clara, CA 95054
Tel:[phone] Fax:[phone]
Page 1 of 17
www.SpectraLinear.com