SOYO SY-5SSM User's Manual & Technical Reference page 19

Hardware Setup
l
CPU FREQUENCY & SDRAM frequency SETTING
(SW1,JP32)
Configure the SW1 jumpers to the settings that match your CPU
speed. Refer to the following tables to set the Frequency Multiplier
and Host Bus Frequency of your CPU:
Frequency Multiplier: SW1
Multiplier
1.5/3.5x
2.0x
2.5x
3.0x
4.0x
4.5x
5.0x
5.5x
Note: The multiplier settings listed apply to all common CPUs. The
IDT X86 CPU CPUs do not conform to the values listed here, refer
to the detailed CPU list that follows for more information.
Host Bus Frequency & SDRAM frequency: JP32
Host Bus
Frequency
66MHz
75MHz
83MHz
90MHz
95MHz
97MHz
100MHz
105MHz
112MHz
124MHz
133MHz
Example: If the working frequency of your CPU is 133MHz, then
select Multiplier=2.0x and Host Bus Frequency=66Mhz accordingly.
1-2
open
short
short
open
short
short
open
open
PCI SDRAM
33MHz 66MHz
30MHz 75MHz
55MHz
33MHz
83MHz
30MHz 90MHz
63.4MHz short short open short
31.7MHz
95MHz
32.3MHz 97MHz
33MHz 100MHz
35MHz 70MHz
75MHz
37.5MHz
112MHz
82.6MHz short open
31MHz
124MHz
88.9MHz short open
33MHz
133MHz
SY-5SSM & SY-5SSM/5 V1.1
3-4
open
open
short
short
open
short
short
open
1-2 3-4
open short short short
open short short open
short short short open
open short open short
short short short short
open short open
short open
open open short short
short open short short
short open short open
open open short open
open open
open open
15
5-6
open
open
open
open
short
short
short
short
5-6 7-8
open
open open
open short
open short
open open
open open