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DRAM Clock/Timing Control
Scroll to this item and press <Enter> to view the following screen:
DRAM Timing Control
X
DRAM CAS Latency
X
RAS Active Time (tRAS)
X
RAS Precharge Time (tRP)
X
RAS to CAS Delay (tRCD)
DDR ADDR/CMD Rate
&'()
: Move
F5:Previous Values
DRAM Timing Control (By SPD)
Enables you to select the CAS latency time in HCLKs of 2, 2.5, or 3. The value is set at the
factory depending on the DRAM installed. Do not change the values in this field unless you
change specifications of the installed DRAM or the installed CPU.
•
DRAM CAS Latency (2.5T): This item controls the timing delay (in clock
cycles) before the DRAM starts a read command after receiving it.
•
RAS Active Time (tRAS) (6T): This item allows you to set the amount of time
a RAS can be kept open for multiple accesses. High figures will improve
performance.
•
RAS Precharge Time (tRP) (3T): This is the duration of the time interval
during which the Row Address Strobe signal to a DRAM is held low during
normal Read and Write Cycles. This is the munimum interval between com-
pleting one read or write and starting another from the same (non-page
mode) DRAM. Techniques such as memory interleaving, or use of Page Mode
DRAM are often used to avoid this delay. Some chipsets require this param-
eter in order to set up the memory configuration properly. The RAS Precharge
value is typically about the same as the RAM Access (data read/write) time.
•
RAS to CAS Delay (tRCD) (3T): This is the amount of time a CAS is per-
formed after a RAS. This lower the better, but some DRAM does not support
low figures.
DRAM ADDR/CMD Rate (Auto)
This option allows you to set the lead off DRAM read and write cycles. When set to Delay
1T, memory read/write commands are sent one clock cycle behind the memory address.
When set to Normal, read/write and memory address commands are sent simultaneously.
Press <Esc> to return to the Advanced Chipset Features page.
Phoenix-AwardBIOS CMOS Setup Utility
DRAM Clock/Timing Control
Enter: Select
+/-/PU/PD:Value F10:Save ESC:Exit F1: General Help
F6:Fail-Safe Defaults
Using BIOS
[By SPD]
Item Help
2.5T
6T
Menu Level
3T
3T
[Auto]
F7:Optimized Defaults
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