DFI G5C900-B - Manual (Page 45)

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COM Express Board
Time” to “System Memory Frequency” fields will
show the default settings by SPD.
Manual If you want better performance for your system
other than the one “by SPD”, select “Manual” then
select the best option in the “CAS Latency Time”
to “System Memory Frequency” fields.
CAS Latency Time
This field is used to select the local memory clock periods.
DRAM RAS# to CAS# Delay
This field is used to select the latency between the DRAM active
command and the read/write command.
DRAM RAS# Precharge
This field is used to select the idle clocks after issuing a precharge
command to the DRAM.
Precharge Delay (tRAS)
The options are Auto and 4 to15.
System Memory Frequency
This field is used to select the frequency of the system memory.
SLP_S4# Assertion Width
The options are 1 to 2 Sec., 2 to 3 Sec., 3 to 4 Sec. and 4 to 5
Sec.
System BIOS Cacheable
When this field is enabled, accesses to the system BIOS ROM ad-
dressed at F0000H-FFFFFH are cached, provided that the cache
controller is enabled. The larger the range of the Cache RAM, the
higher the efficiency of the system.