AV9155
Functionality - AV9155-01
(Using 14.318 MHz input.All frequencies in MHz.)
PERIPHERAL CLOCKS
CLOCK#2CPUand2XCPU
COMMCLK
(Pin 1)
BUSCLK
(Pin 6)
FDCLK
(Pin 7)
KBCLK
(Pin 8)
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*
1.843*
16*
24*
12*
REFERENCE CLOCKS
REFCLK1
(Pin 13)
REFCLK2
(Pin 14)
14.318
14.318
*5Vonly.
Functionality - AV9155-02
(Using 14.318 MHz input.All frequencies in MHz.)
PERIPHERAL CLOCKS
CLOCK#2CPUand2XCPU
COMMCLK
(Pin 1)
BUSCLK
(Pin 6)
FDCLK
(Pin 7)
KBCLK
(Pin 8)
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*
1.843*
32*
24*
12*
REFERENCE CLOCKS
REFCLK1
(Pin 13)
REFCLK2
(Pin 14)
14.318
14.318
*5Vonly.
Frequency Transitions
Using an Input Clock as Reference
A key feature of the AV9155 is its ability to provide smooth,
glitch-freefrequencytransitionsontheCPUand2XCPUclocks
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.
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.
3
ICSI [ INTEGRATED CIRCUIT SOLUTION INC ]
