Cyrix 6X86 Cpus - Abit PR5 User Manual

Cyrix 6x86 CPUs

Clock Chip: PLL52C61-01 or PLL52C61-21
Ext. Clock Factor
CPU:Ext/Int Clock
P 1 2 0 + : 5 0 / 1 0 0 M H z O F F O N
P 1 3 3 + : 5 5 / 1 1 0 M H z O F F O N
P 1 5 0 + : 6 0 / 1 2 0 M H z O F F O N
P 1 6 6 + : 6 6 / 1 3 3 M H z O F F O N
P 2 0 0 + : 7 5 / 1 5 0 M H z O F F O N
Clock Chip: PLL52C59-14T or ICS9159-14
Ext. Clock Factor
CPU:Ext/Int Clock
P 1 2 0 + : 5 0 / 1 0 0 M H z O F F
P 1 3 3 + : 5 5 / 1 1 0 M H z O F F
P 1 5 0 + : 6 0 / 1 2 0 M H z O F F
P 1 6 6 + : 6 6 / 1 3 3 M H z O F F
P 2 0 0 + : 7 5 / 1 5 0 M H z O F F
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 1 D S 2 D S 3
O N / — O N / — O N / —
O N / — O F F / — O N / —
O N / O F F O N / O F F O F F / O N
OF F/ OF F O N / O F F O N / O F F
O N / — O F F / — O F F / —
Ext. Clock Freq. —(Norm/Turbo)
D S 1 D S 2 D S 3
O N O N
O N O F F
O N O F F
O N O N
O N O F F
D S 4 D S 7
D S 4 D S 7
O N O F F / O N
O F F O F F / —
O N O F F / O N
O F F O F F / O N
O F F O N / —
ISA Spd Refresh
D S 5 D S 6
O F F O F F
O N O F F
O N O F F
O N O F F
O N O F F
ISA Spd Refresh
D S 5 D S 6
O F F O F F
O N O F F
O N O F F
O N O F F
O N O F F