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W83193R-01

83.MHZ 3-DIMM CLOCK

Winbond 

W83193R-01

5.2 CPU, SDRAM, PCI Clock Outputs, continued

SYMBOL

PIN

SDRAM [ 0: 11 ]

17,18,20,21,

28,29,31,32,

34,35,37,38

PCICLK [ 2:4 ]

11,12,13

PCICLK5/ PCI_STOP#

15

PRELIMINARY

I/O

FUNCTION

O Synchronous DRAM DIMs clocks which have the

same frequency as CPU clocks

OUT

I/O

Low skew (< 250ps) PCI clock outputs.

Internal 250kΩ pull-up.

If MODE = 1 (default), then this pin is a PCI5 clock

output. If MODE = 0 , then this pin is PCI_STOP #

and used in power management mode for

synchronously stopping the all PCI clocks.

5.3 I2C Control Interface

SYMBOL

PIN

*SDATA

23

*SDCLK

24

I/O

FUNCTION

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

pull-up resistor.

IN Serial clock of I2C 2-wire control interface with

internal pull-up resistor.

5.4 Fixed Frequency Outputs

SYMBOL

PIN

REF0

2

REF1 / CPU_STOP#

46

24MHz / *MODE

25

48MHz / *FS0

26

I/O

FUNCTION

I/O Internal 250kΩ pull-up buffered output of the crystal.

I/O Internal 250kΩ 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.

I/O Internal 250kΩ pull-up.

Latched input for MODE at initial power up. 24MHz

output for super I/O during normal operation.

I/O Internal 250kΩ pull-up.

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

selecting the output frequency of CPU, SDRAM and

PCI clocks. 48MHz output for USB during normal

operation.

Publication Release Date: May 1998

-4-

Revision 0.20

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