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W83193R-02

83.3 MHZ 3-DIMM CLOCK

Winbond 

Preliminary W83193R-02/-04/-04A

5.3 I2C Control Interface

SYMBOL

SDATA

SDCLK

PIN I/O

FUNCTION

23 I/O Serial data of I2C 2-wire control interface

24 IN Serial clock of I2C 2-wire control interface

5.4 Fixed Frequency Outputs

SYMBOL

REF0/CPU3.3#_2.5

REF1/CPU_STOP#

24MHz / *MODE

48MHz / *FS0

PIN I/O

FUNCTION

2 I/O Internal 250kΩ pull-up.

Latched input for CPU3.3#_2.5 at initial power up. Reference

clock during normal operation.

Latched high - VDDq2 = VDDq2b = 2.5V

Latched low - VDDq2 = VDDq2b = 3.3V

46 I/O Internal 250 KΩ pull-up.

If MODE = 1 (default), then this pin is a REF1 buffered output

of the crystal. If MODE = 0 , then this pin is CPU_STOP#

input used in power management mode for synchronously

stopping the all CPU clocks.

25 I/O Internal 250 KΩ pull-up.

Latched input for MODE at initial power up. 24 MHz output for

super I/O during normal operation.

26 I/O Internal 250 KΩ pull-up.

Latched input for FS0 at initial power up for H/W selecting the

output frequency of CPU, SDRAM and PCI clocks. 48 MHz

output for USB during normal operation.

5.5 Power Pins

SYMBOL

VDD

VDDq2

VDDq2b

VDDq3

VSS

PIN

FUNCTION

1

Power supply for Ref [0:1] crystal and core logic.

42

Power supply for CPUCLK[0:3], either 2.5V or 3.3V.

48

Power supply for IOAPIC output, either 2.5V or 3.3V.

6, 14, 19, 30, 36 Power supply for SDRAM, PCICLK and 48/24 MHz outputs.

3, 9, 16, 22, 27, 33, Circuit Ground.

39, 45

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