Samsung 164BX CPU Speed Selection Option 1,2,3, &4, AlphaPC 164UX Configuration Jumpers

CPU Speed Selection (Option 1,2,3, &4)

Figure 3–1 AlphaPC 164UX Configuration Jumpers

Option 1

Option 2

Option 3

Option 4

Option 5

Option 6

Option 7

Option 8

Option 9

Option 10

Option 11

Option 12

Option 13

Option 14

Option 15

Option 16

J28 System Configuration Jumpers

Frequency	Option1 Option2 Option3 Option4
300 MHz	In	In	In	In
333 MHz	Out	In	In	In
366 MHz	In	Out	In	In
400 MHz	Out	Out	In	In
433 MHz	In	In	Out	In
466 MHz	Out	In	Out	In
500 MHz	In	Out	Out	In
533 MHz	Out	Out	Out	In
566 MHz	In	In	In	Out
600 MHz	Out	In	In	Out
633 MHz	In	Out	In	Out
666 MHz	Out	Out	In	Out
700 MHz	In	In	Out	Out
733 MHz	Out	In	Out	Out
766 MHz	In	Out	Out	Out
800 MHz	Out	Out	Out	Out

Option 5 : Pyxis Bus Speed Select(Default Out)

Option 6 : Reserved Default Out

Option 7 : Enable SROM Debug Mode(Default Out)

Option 8 : Enable Firmware Debug Mode(Default Out)

Option 9 : Enable only 1 set of Scache(Default Out)

Option 10 : Reserved Default Out

Option 11 : Boot SAFE ARCSBIOS Image(Default Out)

Option 12 : Reserved Default Out

Option 13 : Must be In

Bcache Size	Option14 Option15
0MB	In	Out
1MB	In	In
2MB	Out	Out
4MB	Out	In

Option 16 : FAN OK Signal Do not ever populate(Default Out)

3.1 CPU Speed Selection (Option 1,2,3, &4)

The clock synthesizer makes it possible to change the frequency of the microproces- sor’s clock input without having to change the clock crystal. Simply set the speed jumpers to adjust the frequency of the microprocessor’s clock. These speed jumpers are located at J28-1/2 (Option 1), J28-3/4 (Option 2), J28-5/6 (Option 3), and J28-7/8 (Option 4). These four jumpers set speed at power-up as listed in Figure 3–1.

3–2AlphaPC 164UX Jumper Configuration