3

AV9155

(Using 14.318 MHz input.All frequencies in MHz.)

CLOCK#2CPUand2XCPU

*5V only.

PERIPHERAL CLOCKS

REFERENCE CLOCKS

Functionality - AV9155-02

(Using 14.318 MHz input.All frequencies in MHz.)

CLOCK#2CPUand2XCPU

PERIPHERAL CLOCKS

REFERENCE CLOCKS

Frequency Transitions

A key feature of the AV9155 is its ability to provide smooth,

glitch-free frequency transitions on the CPU and 2XCPU clocks

when the frequency select pins are changed. These frequency

transitions do not violate the Intel 486 specification of less

than 0.1% frequency change per clock period.

Using an Input Clock as Reference

The AV9155 is designed to accept a 14.318 MHz crystal as the

input reference. With some external changes, it is possible to

use a crystal oscillator or clock input. Please see application

note AN04 for details on driving the AV9155 with a clock.

COMMCLK

(Pin 1)

BUSCLK

(Pin 6)

FDCLK

(Pin 7)

KBCLK

(Pin 8)

1.843*

16*

24*

12*

COMMCLK

(Pin 1)

BUSCLK

(Pin 6)

FDCLK

(Pin 7)

KBCLK

(Pin 8)

1.843*

32*

24*

12*

REFCLK1

(Pin 13)

REFCLK2

(Pin 14)

14.318

14.318

REFCLK1

(Pin 13)

REFCLK2

(Pin 14)

14.318

14.318

FS2

(Pin 11)

FS1

(Pin 19)

FS0

(Pin 20)

2XCPU

(Pin 17)

CPU

(Pin 18)

0

0

0

0

1

1

1

1

0

0

1

1

0

0

1

1

0

1

0

1

0

1

0

1

8

16

32

40

50

66.66

80*

100*

4

8

16

20

25

33.33

40*

50*

FS2

(Pin 11)

FS1

(Pin 19)

FS0

(Pin 20)

2XCPU

(Pin 17)

CPU

(Pin 18)

0

0

0

0

1

1

1

1

0

0

1

1

0

0

1

1

0

1

0

1

0

1

0

1

8

16

32

40

50

66.66

80*

100*

4

8

16

20

25

33.33

40*

50*

*5V only.