AV9155C 查看數據表（PDF） - Integrated Device Technology
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AV9155C Datasheet PDF : 14 Pages
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AV9155C
Functionality - AV9155C-01
(Using 14.318 MHz input. All frequencies in MHz.)
CLOCK#2 CPU and 2XCPU
FS2
(Pin 11)
FS1
(Pin 19)
FS0
(Pin 20)
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
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*
*VDD minimum 3.15V.
PERIPHERAL CLOCKS
COMMCLK BUSCLK
(Pin 1)
(Pin 6)
1.843
16
REFERENCE CLOCKS
REFCLK1
(Pin 13)
14.318
FDCLK
(Pin 7)
24
KBCLK
(Pin 8)
12
REFCLK2
(Pin 14)
14.318
Functionality - AV9155C-02
(Using 14.318 MHz input. All frequencies in MHz.)
CLOCK#2 CPU and 2XCPU
FS2
(Pin 11)
FS1
(Pin 19)
FS0
(Pin 20)
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
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*
* VDD minimum 3.15V
PERIPHERAL CLOCKS
COMMCLK
(Pin 1)
BUSCLK
(Pin 6)
1.843
32
REFERENCE CLOCKS
REFCLK1
(Pin 13)
14.318
FDCLK
(Pin 7)
24
KBCLK
(Pin 8)
12
REFCLK2
(Pin 14)
14.318
Frequency Transitions
Using an Input Clock as Reference
A key feature of the AV9155C 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.
The AV9155C 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 AV9155C with a clock.
3
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