W83194BR-730(2000) Просмотр технического описания (PDF) - Winbond

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W83194BR-730
(Rev.:2000)

166MHZ CLOCK FOR SIS CHIPSET

Winbond 

W83194BR-730

166MHZ CLOCK FOR SIS CHIPSET

1.0 GENERAL DESCRIPTION

The W83194BR-730 is a Clock Synthesizer which provides all clocks required for high-speed RISC or

CISC microprocessor such as AMD K7. W83194BR-730 provides 64 CPU/PCI frequencies which are

selectable with smooth transitions by hardware or software. W83194BR-730 also provides 13 SDRAM

clocks.

The W83194BR-730 provides step-less frequency programming by controlling the VCO freq. and the

programmable PCI clock output divisor ratio. A watch dog timer is quipped and when time out, the

RESET# pin will output 4ms pulse signal.

The W83194BR-730 accepts a 14.318 MHz reference crystal as its input. Spread spectrum built in at

0~-0.5% or ±0.25% to reduce EMI. Programmable stopping individual clock outputs and frequency

selection through I2C interface. The device meets the Pentium power-up stabilization, which requires

CPU and PCI clocks be stable within 2 ms after power-up. Using dual function pin for the slots(ISA, PCI,

CPU, DIMM) is not recommend.

2.0 PRODUCT FEATURES

• Supports AMD CPU with I2C.

• 3 CPU clocks (one free-running CPU clock)

• 13 SDRAM clocks for 3 DIMMs

• 6 PCI synchronous clocks

• 2 AGP clocks

• 2 REF clocks as 14.318MHz outputs

• < 250ps skew among CPU and SDRAM clocks

• < 250ps skew among PCI clocks

• Skew from CPU(earlier) to PCI clock 1 to 4ns, center 2.6ns.

• Smooth frequency switch with selections from 66 MHz to 200 MHz CPU

• Stepless frequency programming by controlling the VCO freq. and the clock output divisor ratio

• Programmable skew for CPU to SDRAM and CPU to AGP clock outputs

• I2C 2-Wire serial interface and I2C read back

• ±0.25% or 0~-0.5% spread spectrum function to reduce EMI

• Programmable registers to enable/stop each output and select modes

• MODE pin for power Management and RESET# out when system hang

• One 48 MHz for USB & one 24_48 MHz for super I/O

• 48-pin SSOP package

Publication Release Date: Oct. 2000

-1-

Revision 0.60

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