ICS951411 Datasheet, PDF (6/19 Pages) Integrated Circuit Systems – System Clock Chip for ATI RS400 P4TM-based Systems

Integrated
Circuit
Systems, Inc.
Table1: CPU Frequency Selection Table
Bit 4
CPU FS4
(CK410#)
Bit 3
CPU FS3 ^Bit2
(SS_EN) ^FSC
Bit1
FSB
Bit0
FSA
0
0
0
0
0
0
0
0
0
1
0
0
0
1
0
0
0
0
1
1
0
0
1
0
0
0
0
1
0
1
0
0
1
1
0
0
0
1
1
1
0
1
0
0
0
0
1
0
0
1
0
1
0
1
0
0
1
0
1
1
0
1
1
0
0
0
1
1
0
1
0
1
1
1
0
0
1
1
1
1
1
0
0
0
0
1
0
0
0
1
1
0
0
1
0
1
0
0
1
1
1
0
1
0
0
1
0
1
0
1
1
0
1
1
0
1
0
1
1
1
1
1
0
0
0
1
1
0
0
1
1
1
0
1
0
1
1
0
1
1
1
1
1
0
0
1
1
1
0
1
1
1
1
1
0
1
1
1
1
1
CPU PCI33 Spread
(MHz) (MHz)
%
266.6667 33.3333
133.3333 33.3333
200.0000 33.3333
166.6668 33.3334 No Spread
333.3335 33.3334
100.0000 33.3333
400.0000 33.3333
C
K
Reserved
4
266.6667 33.3333
1
133.3333 33.3333
0
200.0000 33.3333
166.6668 33.3334 -0.5%
333.3335 33.3334
100.0000 33.3333
400.0000 33.3333
Reserved
100.0000 33.3333
133.3333 33.3333
200.0000 33.3333
166.6668 33.3334 _{No Spread}
200.0000 33.3333
266.6667 33.3333
400.0000 33.3333
C
K
333.3335 33.3334
4
100.0000 33.3333
0
133.3333 33.3333
9
200.0000 33.3333
166.6668 33.3334 _-0.5%
200.0000 33.3333
266.6667 33.3333
400.0000 33.3333
333.3335 33.3334
ICS951411
0891E—03/07/05
6