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MS-5146 version 1.03
1. CPU Core Speed Derivation Procedure
The 4 CPU clock frequencies that the system supports are 50MHz,
55MHz, 60MHz and 66.6MHz (To adjust SW1 pin 3 and 4). See the following
chart to set the different Host Clock Frequencies.
|
SW1
|
CPU Speed
|
|
3
|
4
|
5
|
6
|
Clock
|
Clock
|
|
ON
|
ON
|
OFF
|
ON/OFF
|
50MHz
|
25MHz
|
|
OFF
|
ON
|
OFF
|
ON/OFF
|
55MHz
|
27.5MHz
|
|
ON
|
OFF
|
OFF
|
ON/OFF
|
60MHz
|
30MHz
|
|
OFF
|
OFF
|
OFF
|
ON/OFF
|
66.6MHz
|
33MHz
|
|
ON
|
OFF
|
ON
|
ON/OFF
|
75MHz
|
33MHz
|
|
OFF
|
OFF
|
ON
|
ON/OFF
|
75MHz
|
37.5MHz
|
Note: SW1 Pin 6 is for setting Linear or Toggle mode. Linear mode
Pin6 is On. Toggle mode Pin 6 is off.
2. The DIP Switch SW1 (1,2) is used to set the Core/Bus (Fraction)
ratio of the CPU. The actual core speed of the CPU is the Host Clock
Frequency multiplied by the Core/Bus ratio.
|
SW1
|
CPU
|
|
1
|
2
|
Core/Bus Ratio
|
|
ON
|
ON
|
5 / 2
|
|
OFF
|
ON
|
3 / 1
|
|
ON
|
OFF
|
2 / 1
|
|
OFF
|
OFF
|
3 / 2
|
3. CPU Voltage Setting: JV2-JV4
|
V I/O
|
Vcore
|
JV1
|
|
JV2
|
JV4
|
JV3
|
|
3.38
|
3.38
|
OPEN
|
OPEN
|
OPEN
|
OPEN
|
1-OPEN
2-SHORT
3-SHORT
|
|
3.52
|
3.52
|
SHORT
|
OPEN
|
OPEN
|
OPEN
|
1-OPEN
2-SHORT
3-SHORT
|
|
3.3
|
3.0
|
OPEN
|
OPEN
|
SHORT
|
OPEN
|
1-SHORT
2-SHORT
3-OPEN
|
|
3.3
|
2.8
|
SHORT
|
SHORT
|
OPEN
|
OPEN
|
1-SHORT
2-SHORT
3-OPEN
|
|
3.3
|
2.9
|
SHORT
|
OPEN
|
OPEN
|
SHORT
|
1-SHORT
2-SHORT
3-OPEN
|
4. CPU Speed and Voltage Setting: SW1 & JV2-JV4
To adjust the speed and voltage of the CPU, you must know the specification
of your CPU (always ask the vendor for the CPU specification) then
look at Table 5 (Intel P54C/P55C-MMX), Table 6 (Cyrix 6x86) and Table
7 (AMD 5k86) for proper setting.
5. Intel P54C (Pentium), P55C (MMX) CPU:
|
CPU Type
|
Cpu Voltage
|
CPU Speed
|
|
VI/O
|
Vcore
|
JV2~JV4(from left to right)
(Top to Down)
|
SW1
|
| 1 |
2 |
3 |
4 |
5 |
6 |
| P54C-75 |
3.38
|
JK1
1,2 - Short
3,4 - Open
5,6 - Short |
JV2-JV4- all Open
J3-Short (2,3)
|
OFF |
OFF |
ON |
ON |
OFF |
OFF |
| P54C-90 |
3.38
|
JV2-JV4- all Open
J3-Short (2,3)
|
OFF
|
OFF
|
ON
|
OFF
|
OFF
|
OFF
|
|
3.52
|
JV2-Short (first)
JV2-Open (Second)
JV4-All Open
JV3-Short (2,3)
|
| P54C-100 |
3.38
|
JV2-JV4 - ALL OPEN
JV3-SHORT (2,3)
|
OFF
|
OFF
|
OFF
|
OFF
|
OFF
|
OFF
|
| P54C-120 |
3.38
|
ON
|
OFF
|
ON
|
OFF
|
OFF
|
OFF
|
| P54C-133 |
3.38/3.52
|
JV2-JV4-
all Open
J3-Short (2,3)
|
JV2-Short (first)
JV2-Open (Second)
JV4-All Open
JV3-Short (2,3) |
ON
|
OFF
|
OFF
|
OFF
|
OFF
|
OFF
|
| P54C-150 |
3.38/3.52
|
ON
|
ON
|
ON
|
OFF
|
OFF
|
OFF
|
| P54C-166 |
3.38/3.52
|
ON
|
ON
|
OFF
|
OFF
|
OFF
|
OFF
|
| P55C-166 |
3.33
|
2.8
|
JV2-SHORT (1,2)
JV4-ALL OPEN
JV3-SHORT (1,2)
|
| P54C-200 |
3.52
|
V2-Short (first)
JV2-Open (Second)
JV4-All Open
JV3-Short (2,3)
|
OFF
|
ON
|
OFF
|
OFF
|
OFF
|
OFF
|
| P55C-200 |
3.33
|
2.8
|
JV2-SHORT (1,2)
JV4-ALL OPEN
JV3-SHORT (1,2)
|
Note: JK1 is only use for 75MHz. Using other CPU type must
leave the JK1 open.
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6. Cyrix 6x86 CPU
Cyrix 6x86CPU uses P to rate the speed of its processor base on
Intel CPU core speed, for example P120+ (100Mhz) has 120MHz core
speed of Intel but has 100MHz core speed in Cyrix. Cyrix 6x68 CPU
should always uses a more powerful fan (ask vendor for proper colling
fan).
|
CPU Type
|
Cpu Voltage
|
CPU Speed
|
|
VI/O
|
Vcore
|
JV2~JV4(from left to right)
(Top to Down)
|
SW1
|
|
1
|
2
|
3
|
4
|
5
|
6
|
| P120+ (100MHz) |
3.52
|
JK1
1,2 - Short
3,4 - Open
5,6 - Short |
JV2-Short (first)
JV2-Open (Second)
JV4-All Open
JV3-Short (2,3)
|
OFF |
ON |
ON |
ON |
OFF |
ON |
| P133+ (110MHz) |
JV2-Short (first)
JV2-Open (Second)
JV4-All Open
JV3-Short (2,3)
|
ON
|
OFF
|
OFF
|
ON
|
OFF
|
ON
|
| P150+ (120MHz) |
JV2-All Short
JV4-All Open
JV3-Short (1,2)
|
ON
|
OFF
|
ON
|
OFF
|
OFF
|
ON
|
P166+
(133MHz) |
3.4 |
2.8 |
ON
|
OFF
|
OFF
|
OFF
|
OFF
|
ON
|
| P200+ (150MHz) |
3.38/3.52
|
JV2-Short (first)
JV2-Open (Second)
JV4-All Open
JV3-Short (2,3)
|
ON |
OFF |
ON |
OFF |
ON |
ON |
Note: The Cyrix CPU can be set to Linear or Toggle mode, But we
recommend that you use the linear mode so the Pin 6 is On.
P200+(150MH) - PCI clock is 33MHz.
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7. AMD 5K86CPU
AMD 5K86 CPU uses PR to rate the speed of its processor base on Intel
CPU core speed, for example PR133+(100MHz) has 133MHz core speed of
Intel but has 100MHz core speed in AMD 5K86CPU.
|
CPU Type
|
Cpu Voltage
|
CPU Speed
|
|
VI/O
|
Vcore
|
JV2~JV4(from left to right)
(Top to Down)
|
SW1
|
|
1
|
2
|
3
|
4
|
5
|
6
|
| PR75 |
3.52
|
JK1
1,2 - Short
3,4 - Open
5,6 - Short |
JV2-Short (first)
JV2-Open (Second)
JV4-All Open
JV3-Short (2,3)
|
OFF |
OFF |
ON |
ON |
OFF |
OFF |
| PR90 & PR120 |
JV2-Short (first)
JV2-Open (Second)
JV4-All Open
JV3-Short (2,3)
|
OFF
|
OFF
|
ON
|
OFF
|
OFF
|
OFF
|
| PR100 & PR133 |
OFF
|
OFF
|
OFF
|
OFF
|
OFF
|
OFF
|
| PR166 |
ON
|
ON
|
OFF
|
OFF
|
OFF
|
OFF
|
Note: JK1 is only use for 75MHz. Using other CPU type must leave
the JK1 open
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