3-11
BIOS Setup
DRAM Configuration
Press <Enter> to enter the sub-menu and the following screen appears:
Timing Mode
This field has the capacity to automatically detect all of the DRAM timing. If you
set this field to [Manual], the following fields will be selectable. Setting options:
[Auto], [Manual].
Memclock index value (Mhz)
When it is set to Manual in “Timing Mode”, user can place an artificial memory
clock on the system. Setting options: [100MHz], [133MHz], [166MHz], [200MHz].
CAS# Latency (Tcl)
When the Timing Mode is set to [Manual], the field is adjustable.This controls
the CAS latency, which determines the timing delay (in clock cycles) before
SDRAM starts a read command after receiving it. Setting options: [2.0], [2.5],
[3.0]. [2.0] increases the system performance the most while [3.0] provides the
most stable performance.
Min RAS# Active Time (Tras)
When the Timing Mode is set to [Manual], the field is adjustable. This setting
determines the time RAS takes to read from and write to a memory cell. Setting
options: [Auto], [5T~15T].
RAS# to CAS# Delay (Trcd)
When the Timing Mode is set to [Manual], the field is adjustable. 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 address
strobe) to CAS (column address strobe). The less the clock cycles, the faster
the DRAM performance. Setting options: [Auto], [2T~7T].
Row Precharge Time (Trp)
When the Timing Mode is set to [Manual], the field is adjustable. This item
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, refreshing may be incomplete and DRAM may fail to retain
data. This item applies only when synchronous DRAM is installed in the system.
Setting options: [Auto], [2T~7T].
Row to Row delay (Trrd)
When the Timing Mode is set to [Manual], the field is adjustable. Specifies the
active-to-active delay of different banks. Setting options: [Auto], [2T], [3T], [4T].
6 N GI
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