ICS951413 Datasheet, PDF (8/23 Pages) Integrated Circuit Systems – Programmable System Clock Chip for ATI RS400 P4-based Systems

Integrated
Circuit
Systems, Inc.
ICS951413
Table 3: CPU Divider Ratios
Divider (3:2)
Bit
00
01
10
11
MSB
00
0000
2
0100
4
1000
8
1100
16
01
0001
3
0101
6
1001
12
1101
24
10
0010
5
0110
10
1010
20
1110
40
11
0011
15
0111
30
1011
60
1111
120
LSB Address Div Address Div Address Div Address Div
Table 4: PCI Divider Ratios
Divider (3:2)
Bit
00
01
10
11
MSB
00
0000
4
0100
8
1000
16
1100
32
01
0001
3
0101
6
1001
12
1101
24
10
0010
5
0110
10
1010
20
1110
40
11
0011
15
0111
30
1011
60
1111
120
LSB Address Div Address Div Address Div Address Div
Table 5: SRC, ATIG Divider Ratios
Divider (3:2)
Bit
00
01
10
11
MSB
00
0000
2
0100
4
1000
8
1100
16
01
0001
3
0101
6
1001
12
1101
24
10
0010
5
0110
10
1010
20
1110
40
11
0011
7
0111
14
1011
28
1111
56
LSB Address Div Address Div Address Div Address Div
Table 6: Test Clarification Table
Comments
1. Power-up w/ TEST_SEL/REF2 > 2.0V to enter test
mode.
HW
TEST_SEL/REF2
HW PIN
<0.8V
>2.0V
OUTPUT
NORMAL
HI-Z
0929C—03/07/05
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