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W83193R-01

83.MHZ 3-DIMM CLOCK

Winbond 

W83193R-01

5.0 PIN DESCRIPTION

IN - Input

OUT - Output

I/O - Bi-directional Pin

# - Active Low

* - Internal 250kΩ pull-up

5.1 Crystal I/O

SYMBOL

PIN

Xin

4

Xout

5

PRELIMINARY

I/O

IN

OUT

FUNCTION

Crystal input with internal loading capacitors and

feedback resistors.

Crystal output at 14.318MHz nominally.

5.2 CPU, SDRAM, PCI Clock Outputs

SYMBOL

CPUCLK [ 0:3 ]

IOAPIC

SDRAM [ 0:11]

PCICLK_F/ *FS1

PCICLK 0 / *FS2

PCICLK 1/ *FTS

PIN

40,41,43,44

47

17,18,20,21,28

,29,31,32,34,

35,37,38

7

8

10

I/O

OUT

OUT

O

I/O

I/O

I/O

FUNCTION

Low skew (< 250ps) clock outputs for host

frequencies such as CPU, Chipset and Cache.

Vddq2 is the supply voltage for these outputs.

High drive buffered output of the crystal, and is

powered by VDDq2.

SDRAM clock outputs which have the same

frequency as CPU clocks.

Latched input for FS1 at initial power up for H/W

selecting the output frequency of CPU, SDRAM and

PCI clocks.

Free running PCI clock during normal operation.

Latched input for FS2 at initial power up for H/W

selecting the output frequency of CPU, SDRAM and

PCI clocks.

PCI clock during normal operation.

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

selecting the output frequency of CPU, SDRAM and

PCI clocks.

PCI clock during normal operation.

Publication Release Date: May 1998

-3-

Revision 0.20

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