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Hardware Setup SY-5SSM & SY-5SSM/5
15
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 1-2 3-4 5-6
1.5/3.5x open open open
2.0x short open open
2.5x short short open
3.0x open short open
4.0x short open short
4.5x short short short
5.0x open short short
5.5x open open short
Note: The multiplier settings listed apply to all common CPUs. The
IDT Winchip 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
PCI SDRAM 1-2 3-4 5-6 7-8
66MHz 33MHz 66MHz open short short short
75MHz 30MHz 75MHz open short short open
55MHz short short short open
83MHz 33MHz
83MHz open short open short
90MHz 30MHz 90MHz short short short short
63.4MHz short short open short
95MHz 31.7MHz
95MHz open short open open
100MHz 33MHz 100MHz open open short short
105MHz 35MHz 70MHz short open short short
75MHz short open short open
112MHz 37.5MHz
112MHz open open short open
82.6MHz short open open short
124MHz 31MHz
124MHz open open open short
88.9MHz short open open open
133MHz 33MHz
133MHz open open open open
Example: If the working frequency of your CPU is 133MHz, then
select Multiplier=2.0x and Host Bus Frequency=66Mhz accordingly.