MSI Big Bang-XPower - Manual (Page 72)

3-22
BIOS Setup MS-7666
Chapter 3
BIOS Setup MS-7666
Chapter 3
CH1/ CH2/ CH3 or CH1-3 CAS Latency (CL)
This controls the CAS latency, which determines the timing delay (in clock cycles)
before SDRAM starts a read command after receiving it.
CH1/ CH2/ CH3 or CH1-3 tRCD
When DRAM is refreshed, both rows and columns are addressed separately. This
setup item allows you to determine the timing of the transition from RAS (row ad-
dress strobe) to CAS (column address strobe). The less the clock cycles, the faster
the DRAM performance.
CH1/ CH2/ CH3 or CH1-3 tRP
This setting controls the number of cycles for Row Address Strobe (RAS) to be
allowed to precharge. If insufficient time is allowed for the RAS to accumulate its
charge before DRAM refresh, refresh may be incomplete and DRAM may fail to
retain data. This item applies only when synchronous DRAM is installed in the sys-
tem.
CH1/ CH2/ CH3 or CH1-3 tRAS
This setting determines the time RAS takes to read from and write to memory cell.
CH1/ CH2/ CH3 or CH1-3 tRFC
This setting determines the time RFC takes to read from and write to a memory
cell.
CH1/ CH2/ CH3 or CH1-3 tWR
Minimum time interval between end of write data burst and the start of a precharge
command. Allows sense amplifiers to restore data to cells.
CH1/ CH2/ CH3 or CH1-3 tWTR
Minimum time interval between the end of write data burst and the start of a col-
umn-read command. It allows I/O gating to overdrive sense amplifiers before read
command starts.
CH1/ CH2/ CH3 or CH1-3 tRRD
Specifies the active-to-active delay of different banks.
CH1/ CH2/ CH3 or CH1-3 tRTP
Time interval between a read and a precharge command.
CH1/ CH2/ CH3 or CH1-3 tFAW
This item is used to set the tFAW timing.
Current CH1/ CH2/ CH3 or CH1-3 tdrRdTRd/ tddRdTRd/ tsrRdTWr/ tdrRdTWr/
tddRdTWr/ tsrWrTRd/ tdrWrTRd/ tddWrTRd/ tdrWrTWr/ tddWrTWr/ tsrRdTRd/
tsrWrTWr
These item show the advanced DRAM timings.
Channel 1/ Channel 2/ Channel 3 or Channel 1-3 Advance Timing
Setting to [Auto] enables the advance memory timing automatically to be determined
by BIOS. Setting to [Manual] allows you to set the following advanced memory tim-
ings.
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