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Introducing the BIOS
User’s Manual
3-15
Advanced DRAM Control 1:
This item can let you set several items concerning the DRAM parameters. If you do not understand what
each item does, please keep the default settings. Wrong settings may cause system unstablity, data loss or
even prevent boot up!
Figure 3-5B. Advanced DRAM Control 1 Screen Shot
System Performance:
Six options are available: Manual Mode ) Safe Mode ) Normal Mode ) Fast Mode ) Turbo Mode
) Ultra Mode. The default setting is Normal Mode. If you choose the Manual Mode, the following items
will be available.
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DDR RAS Precharge Time (tRP):
Three options are available: 3T ) 2T ) 4T. The default setting is 3T. This item is to set SDR/DDR
SDRAM RAS precharge time. It can define the SDRAM precharge to ACT command period.
tRP timing value (Precharge time – time from precharge command to when back can be activated).
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DDR RAS to CAS Delay (tRCD):
Three options are available: 3T ) 2T ) 4T. The default setting is 3T. This item is to set SDR/DDR
SDRAM RAS to CAS delay. It can define the SDRAM ACT to Read/Write command period.
tRCD timing value = RAS to CAS latency + rd/wr command delay
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DDR Write Recovery Time (tWR):
Two options are available: 2T ) 1T. The default setting is 2T. This item is to set SDR/DDR SDRAM
write recovery time. This item (bit) controls the number of clock cycles that must occur from the last
valid write operation to the earlist time a new Precharge command can be asserted to the same bank.
When you set it to 1T, tWR duration is 1 clock cycle, etc.