DTK PAM-0066I, User Manual

Page: 18 / 67

Chapter 2
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2.5 CPU EXTERNAL (BUS) FREQUENCY SELECTION
(SW1-6,7,8)
These switches tell the clock generator what frequency to send to the CPU. The Bus
clock times the Bus Ration equals the CPU’s Internal frequency.
2.6 CPU TO BUS FREQUENCY RATION (SW1-3,4,5)
These jumpers set the frequency ration between the Internal frequency of the CPU and
the External frequency (called the Bus clock) within the CPU. These must be set
together with the above jumpers CPU External (Bus) Frequency Selection.
Fig 5
CPU Type Freq. Ration Bus Freq. Ration Setting Bus Freq. Setting
Freq. SW1-3 SW1-4 SW1-5 SW1-6 SW1-7 SW1-8
Intel Pentium 90MHz 1.5x 60MHz OFF OFF OFF ON OFF OFF
Intel Pentium 100MHz 1.5x 66MHz OFF OFF OFF OFF ON OFF
Intel Pentium 120MHz 2.0x 60MHz ON OFF OFF ON OFF OFF
Intel Pentium 133MHz 2.0x 66MHz ON OFF OFF OFF ON OFF
Intel Pentium 166MHz 2.5x 66MHz ON ON OFF OFF ON OFF
Intel Pentium 200MHz 3.0x 66MHz OFF ON OFF OFF ON OFF
Intel Pentium w/MMX 166MHz 2.5x 66MHz ON ON OFF OFF ON OFF
Intel Pentium w/MMX 200MHz 3.0x 66MHz OFF ON OFF OFF ON OFF
Intel Pentium w/MMX 233MHz 3.5x 66MHz OFF OFF OFF OFF ON OFF
Cyrix 6x86L-PR150 120MHz 2.0x 60MHz ON OFF OFF ON OFF OFF
Cyrix 6x86L-PR166 133MHz 2.0x 66MHz ON OFF OFF OFF ON OFF
Cyrix 6x86L-PR200 150MHz 2.0x 75MHz ON OFF OFF OFF OFF ON
Cyrix 6x86MX-PR166 150MHz 2.5x 60MHz ON OFF OFF ON OFF OFF
Cyrix 6x86MX-PR200 150MHz 2.0x 75MHz ON OFF OFF OFF OFF ON
AMD-K5-PR120 120MHz 2.0x 60MHz ON OFF OFF ON OFF OFF
AMD-K5-PR133 133MHz 2.0x 66MHz ON OFF OFF OFF ON OFF
AMD-K5-PR166 166MHz 2.5x 66MHz ON ON OFF OFF ON OFF
AMD-K6/166 166MHz 2.5x 66MHz ON ON OFF OFF ON OFF
AMD-K6/200 200MHz 3.0x 66MHz OFF ON OFF OFF ON OFF
AMD-K6/233 233MHz 3.5x 66MHz OFF OFF OFF OFF ON OFF
AMD-K6/266 266MHz 4.0x 66MHz ON ON ON OFF ON OFF
ON
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