Asus P/E-P55T2P4D JP16, JP15, JP30, JP29, Ratio, Internal, External, 6.CPU to BUS Frequency Ratio (JP15 & 16), 7.CPU External (BUS) Frequency Selection (JP29 & 30)

INSTALLATION .III (Jumpers)

III.INSTALLATION

6.CPU to BUS Frequency Ratio (JP15 & 16)

These jumpers set the frequency ratio 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.

7.CPU External (BUS) Frequency Selection (JP29 & 30)

These jumpers instructs the clock generator what frequency to send to the CPU. These allow the selection of the CPU’s External frequency (or BUS Clock). The BUS Clock times the BUS Ratio equals the CPU's Internal frequency (the ad- vertised CPU speed).

JP16	JP15			JP16	JP15	JP16	JP15	JP16	JP15
1.5 x				2.0 x		2.5 x		3.0 x
CPU : BUS Frequency Ratio (1.5x, 2.0x, 2.5x, 3.0x)
	1	2	3		1	2	3		1	2	3
JP30					JP30			JP30
JP29					JP29			JP29
	50MHz				60MHz				66MHz

CPU External Clock (BUS) Frequency Selection (Rev 1.3)

Set the above jumpers by the Internal speed of the Intel CPU as follows:

			(BUS Ratio)		(BUS Frequency)
Internal	Ratio	External	JP16	JP15	JP30	JP29
200MHz	3.0x	66MHz	[open]	[short]	[1-2]	[2-3]
180MHz	3.0x	60MHz	[open]	[short]	[2-3]	[1-2]
166MHz	2.5x	66MHz	[short]	[short]	[1-2]	[2-3]
150MHz	2.5x	60MHz	[short]	[short]	[2-3]	[1-2]
133MHz	2.0x	66MHz	[short]	[open]	[1-2]	[2-3]
120MHz	2.0x	60MHz	[short]	[open]	[2-3]	[1-2]
100MHz	1.5x	66MHz	[open]	[open]	[1-2]	[2-3]
90MHz	1.5x	60MHz	[open]	[open]	[2-3]	[1-2]
75MHz	1.5x	50MHz	[open]	[open]	[2-3]	[2-3]

10 P/E-P55T2P4D User’s Manual