AV9155
Functionality
- AV9155-01
(Using 14.318 MHz input. All frequencies in MHz.)
CLOCK#2 CPU and 2XCPU
FS2
(Pin 11)
0
0
0
0
1
1
1
1
FS1
(Pin 19)
0
0
1
1
0
0
1
1
FS0
(Pin 20)
0
1
0
1
0
1
0
1
2XCPU
(Pin 17)
8
16
32
40
50
66.66
80*
100*
CPU
(Pin 18)
4
8
16
20
25
33.33
40*
50*
PERIPHERAL CLOCKS
COMMCLK
(Pin 1)
1.843*
BUSCLK
(Pin 6)
16*
FDCLK
(Pin 7)
24*
KBCLK
(Pin 8)
12*
REFERENCE CLOCKS
REFCLK1
(Pin 13)
14.318
REFCLK2
(Pin 14)
14.318
*5V only.
Functionality - AV9155-02
CLOCK#2 CPU and 2XCPU
FS2
(Pin 11)
0
0
0
0
1
1
1
1
FS1
(Pin 19)
0
0
1
1
0
0
1
1
FS0
(Pin 20)
0
1
0
1
0
1
0
1
(Using 14.318 MHz input. All frequencies in MHz.)
PERIPHERAL CLOCKS
2XCPU
(Pin 17)
8
16
32
40
50
66.66
80*
100*
CPU
(Pin 18)
4
8
16
20
25
33.33
40*
50*
COMMCLK
(Pin 1)
1.843*
BUSCLK
(Pin 6)
32*
FDCLK
(Pin 7)
24*
KBCLK
(Pin 8)
12*
REFERENCE CLOCKS
REFCLK1
(Pin 13)
14.318
REFCLK2
(Pin 14)
14.318
*5V only.
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.
3
ICS [ INTEGRATED CIRCUIT SYSTEMS ]
