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W311_05 Datasheet, PDF (1/19 Pages) Cypress Semiconductor – FTG for VIA™ Pro-266 DDR Chipset | |||
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W311
FTG for VIA⢠Pro-266 DDR Chipset
Features
⢠Maximized EMI Suppression using Cypressâs 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
Block Diagram
Pin Configuration[1]
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 #: 38-07703 Rev. **
Revised March 14, 2005
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