Abit UL8 - Page 34

3-10 Chapter 3
When set to [By SPD], the BIOS will read the DRAM module SPD data and automatically set the DRAM
clock by the value stored in it.
! CAS Latency Time:
Three options are available: 2 $ 2.5 $ 3. The default setting is 2.5. You can select SDRAM CAS
(Column Address Strobe) latency time according your SDRAM specification.
! Row Cycle Time:
This item specifies the RAS# active to RAS# active time or auto refresh time of the same bank.
! Row Refresh Cycle Time:
This item specifies the auto refresh active to RAS# active time or RAS# auto refresh time.
! RAS# to CAS# Delay:
This item specifies the RAS# active to CAS# read write delay time to the same bank.
! RAS# to RAS# Delay:
This item specifies the RAS# active to RAS# active delay time of different bank.
! Min. RAS# Active Time:
This item specifies the minimum RAS# active time.
! RAS# Precharge Time:
This item specifies the RAS# precharge time.
! Write Recovery Time:
This item specifies the time measured from the last write datum is safely registered by the DRAM.
! Write to Read Delay:
This item specifies the time measured from the rising edge following the last non-masked data strobe to
the rising edge of the next read command.
! Read to Write Delay:
This item specifies the read to write delay.
! DRAM Command Rate:
Two options are available: 2T Command or 1T Command. The default setting is 2T Command. When the
host (northbridge) locates the desired memory address, it then processes the wait state of commands.
! Burst Length
DDR SDRAM modules provide a Burst mode that means an auto precharge function for programmable
READ or WRITE burst lengths of 4 or 8 locations.
This means that if we set burst length to 8, the address bus will access 8 bytes each cycle to precharge,
etc.
! Bank Interleaving:
Three options are available: Disabled $ 2 Way $ 4 Way. The default setting is Disabled. Depending on
your SDRAM module structure, the 4-Way setting can offer the best performance. If you choose the
wrong setting, the computer system will not run in a stable manner. For detailed information on your
SDRAM module, please ask your SDRAM module manufacturer.
UL8