CY28317-2 Datasheet, PDF (1/21 Pages) Cypress Semiconductor – FTG for Mobile VIA PL133T and PLE133T Chipsets

17-2
CY28317-2
FTG for Mobile VIA™ PL133T and PLE133T Chipsets
Features
• Single-chip system frequency synthesizer for mobile
VIA PL133T and PLE133T chipsets
• Programmable clock output frequency with less than
1 MHz increment
• Integrated fail-safe Watchdog Timer for system
recovery
• Automatic switch to HW-selected or SW-programmed
clock frequency when Watchdog Timer time-out occurs
• System RESET generation capability 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 for SDRAM and PCI
output clocks
• Programmable output skew for CPU, PCI and SDRAM
• Maximized EMI Suppression using Cypress’s Spread
Spectrum technology
• Available in 48-pin SSOP and TSSOP packages
Key Specifications
CPU to CPU Output Skew:.......................................... 175 ps
PCI to PCI Output Skew:............................................. 500 ps
Block Diagram
Pin Configuration^[1]
X1
XTAL
X2
OSC
PLL Ref Freq
MULT_SEL
IREF
VTT_PWRGD#
PCI_STOP#
CPU_STOP#
PD#
PLL 1
÷2,3,4
VDD_REF
REF0
REF1/FS2*
CPU0:1, CPUT, CPUC
VDD_PCI
PCI0_F/FS4*
PCI1/FS3*
PCI2:6
SDATA
SCLK
SMBus
Logic
PLL2
SDRAMIN
Reset
Logic
÷2
RST#
VDD_48MHz
48MHz/FS0*
24_48MHz/FS1*
VDD_SDRAM
SDRAM0:6
7
GND_CPU 1
*FS2/REF1 2
REF0 3
VTT_V__DP_DW_{_}R_RG_ED_F#
4
5
GND_REF 6
X1 7
X2 8
VDD_PCI 9
*FS4/PCI0_F 10
*FS3/PCI1 11
GND_PCI 12
PCI2 13
PCI3 14
PCI4 15
PCI5 16
PCI6 17
SDRAMIN 18
*CPU_STOP# 19
*PCI_STOP# 20
*PD# 21
*MULT_SEL 22
GND_48MHz 23
SDATA 24
48 CPU0
47 CPU1
46 VDD_CPU_2.5
45 VDD_CPU_3.3
44 CPUT
43 CPUC
42 GND_CPU
41 RST#
40 IREF
39 SDRAM6
38 GND_SDRAM
37 SDRAM0
36 SDRAM1
35 VDD_SDRAM
34 SDRAM2
33 SDRAM3
32 GND_SDRAM
31 SDRAM4
30 SDRAM5
29 VDD_SDRAM
28 VDD_48MHz
27 48MHz/FS0*
26 24_48MHz/FS1*
25 SCLK
Note:
1. Signals marked with ‘*’ have internal pull-up resistors.
Cypress Semiconductor Corporation • 3901 North First Street • San Jose • CA 95134 • 408-943-2600
Document #: 38-07094 Rev. *B
Revised December 26, 2002