ICS94258中文资料瑞萨数据手册PDF规格书

Recommended Application:

ALI 1644 style chipset

Output Features:

• 2 - CPU clocks (including 1 free running) @ 2.5V

• 13 - SDRAM @ 3.3V

• 7 - PCI (including 1 free running and 1 early selectable

free running) @ 3.3V

• 2 - AGP @ 3.3V

• 1 - IOAPIC 14.318MHz @ 2.5V

• 1 - 48MHz, @ 3.3V

• 1 - REF 14.318MHZ @ 3.3V, (selectable strength 1X or

2X) through I2C programming

Features:

• Programmable ouput frequency

• Programmable ouput rise/fall time

• Programmable CPU, SDRAM, PCI and AGP skew

• Real time system reset output

• Spread spectrum for EMI control typically

by 7dB to 8dB, with programmable spread percentage

• Watchdog timer technology to reset system

if over-clocking causes malfunction

• Uses external 14.318MHz crystal

Skew Specifications:

• CPU - CPU: <250ps

• PCI - PCI: <500ps

• SDRAM - SDRAM: <250ps

• AGP - AGP: <500ps

• PCI - AGP: <750ps

• CPU - SDRAM:<350ps

• CPU - PCI: