Intel Pentium Cpus - Abit PR5 User Manual

Intel Pentium CPUs

Clock Chip: PLL52C61-01 or PLL52C61-21
Ext. Clock Factor
CPU:Ext/Int Clock D S 1
P 7 5 : 5 0 / 7 5 MH z O F F
P 9 0 : 6 0 / 9 0 MH z O F F
P 1 0 0 : 6 6 / 1 0 0 M H z O F F
P 1 2 0 : 6 0 / 1 2 0 M H z O F F
P 1 3 3 : 6 6 / 1 3 3 M H z O F F
P 1 5 0 : 6 0 / 1 5 0 M H z O N
P 1 6 6 : 6 6 / 1 6 6 M H z O N
P 2 0 0 : 6 6 / 2 0 0 MH z O N
Clock Chip: PLL52C59-14T or ICS9159-14
Ext. Clock Factor
CPU:Ext/Int Clock D S 1
P 7 5 : 5 0 / 7 5 MH z O F F
P 9 0 : 6 0 / 9 0 MH z O F F
P 1 0 0 : 6 6 / 1 0 0 M H z O F F
P 1 2 0 : 6 0 / 1 2 0 M H z O F F
P 1 3 3 : 6 6 / 1 3 3 M H z O F F
P 1 5 0 : 6 0 / 1 5 0 M H z O N
P 1 6 6 : 6 6 / 1 6 6 M H z O N
P 2 0 0 : 6 6 / 2 0 0 MH z O N
Note:
ICS9159-14 does not support Turbo mode at 75MHz
ISA Spd. – ISA Bus Clock speed, see page 2-19
Refresh – DRAM refresh [reserved for future use] always OFF
DS8 – reserved for future use, always OFF
Ext. Clock Freq.: Normal/Turbo
D S 2 D S 3 D S 4
O F F O N / – O N / – O N / –
O F F O N / O F F O N / O F F O F F / O N
O F F OF F/ OF F O N / O F F O N / O F F
O N O N / O F F O N / O F F O F F / O N
O N OF F/ OF F O N / O F F O N / O F F
O N O N / O F F O N / O F F O F F / O N
O N OF F/ OF F O N / O F F O N / O F F
O F F OF F/ OF F O N / O F F O N / O F F
Ext. Clock Freq. —(Norm/Turbo)
D S 2 D S 3 D S 4
O F F O N O N
O F F O F F O N
O F F O N O F F
O N O F F O N
O N O N O F F
O N O F F O N
O N O N O F F
O F F O N O F F
ISA Spd Refresh
D S 7 D S 5
O F F
O N
O N
O N
O N
O N
O N
O N
ISA Spd Refresh
D S 7 D S 5
O F F / O N O F F
O F F / O N O N
O F F / O N O N
O F F / O N O N
O F F / O N O N
O F F / O N O N
O F F / O N O N
O F F / O N O N
D S 6
O F F
O F F
O F F
O F F
O F F
O F F
O F F
O F F
D S 6
O F F
O F F
O F F
O F F
O F F
O F F
O F F
O F F