User manual

19 SOM-4461 A2 Version User Manual
Chapter 3 BIOS settings
! Summary Screen Show [Enabled]
This item allows the user to set if the BIOS should show the summary screen or
not.
3.2.4 Advanced Chipset Features
! DRAM Timing Selectable [By SPD]
This item enables users to set the optimal timings for items 2 through 5. The
system default setting of "By SPD" follows the SPD information and ensures the
system running stable and at optimal performance.
! CAS Latency Time [Auto]
This item enables users to set the timing delay in clock cycles before SDRAM
starts a read command after receiving it.
! DRAM RAS# to CAS# Delay [Auto]
This item enables users to set the timing of the transition from RAS (row
address strobe) to CAS (column address strobe) as both rows and column are
separately addressed shortly after DRAM is refreshed.
! DRAM RAS# Precharge [Auto]
This item enables users to set the DRAM RAS# precharge timing, system
default is setting to "Auto" to reference the data from SPD ROM.
! Precharge delay (tRAS) [Auto]
This item allows user to adjust memory precharge time
! System Memory Frequency [Auto]
This item allows the user to adjust memory frequency to improvement perfor-
mance.
Note! The "Advanced Chipset Features" screen controls the configuration of
the board's chipset register settings and performance tuning - the
options on this screen may vary depending on the chipset type. It is
strongly recommended that only technical users make changes to the
default settings.