FTG for VIA™ Pro-266 DDR Chipset
W311
Cypress Semiconductor Corporation
•
3901 North First Street
•
San Jose
, CA 95134
•
408-943-2600
Document #: 38-07703 Rev. **
Revised March 14, 2005
Features
• Maximized EMI Suppression using Cypress’s Spread
Spectrum Technology
• System frequency synthesizer for VIA Pro-2000
• Programmable clock output frequency with less than 1
MHz increment
• Integrated fail-safe Watchdog Timer for system
recovery
• Automatically switch to HW selected or SW
programmed clock frequency when Watchdog Timer
time-out
• Capable of generate 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 for CPU and PCI output
clocks
• Programmable output skew between CPU, AGP and PCI
• Supports Intel® Celeron® and Pentium® III class
processor
• Three copies of CPU output
• Nine copies of PCI output
• One 48-MHz output for USB
• One 24-MHz or 48-MHz output for SIO
• Two buffered reference outputs
• Three copies of APIC output
• Supports frequencies up to 200MHz
• SMBus Interface for programming
• Power management control inputs
• Available in 48-pin SSOP
Key Specifications
CPU Cycle-to-cycle Jitter: ..........................................250 ps
CPU to CPU Output Skew...........................................175 ps
PCI Cycle-to-cycle Jitter: .............................................500 ps
PCI to PCI Output Skew:.............................................500 ps
Note:
1. Signals marked with * have internal pull-up resistors
[1]
Block Diagram
Pin Configuration
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