Chapter 3
3-28
Precharge to Active (Trp)
Set the time from DRAM precharge to active state. Settings:
2T
and
3T
.
Active to Precharge (Tras)
Set the time from active back to precharge state. Settings:
5T
and
6T
.
Active to CMD (Trcd)
Set the time from active state to command state. Settings:
2T
and
3T
.
DRAM Command Rate
This setting controls the DRAM command rate. Selecting 1T allows DRAM
signal controller to run at 1T (T=clock cycles) rate. Selecting 2T makes
DRAM signal controller run at 2T rate. 1T is faster than 2T. Settings:
2T
Command
and
1T Command
.
DRAM Burst Len
This setting allows you to set the size for DRAM Burst-Length. The bigger
the size, the faster the system addresses memory. Settings:
4
and
8
.
Spread Spectrum
When the mainboard’s clock generator pulses, the extreme values (spikes) of
the pulses creates EMI (Electromagnetic Interference). The Spread Spectrum
function reduces the EMI generated by modulating the pulses so that the
spikes of the pulses are reduced to flatter curves. If you do not have any EMI
problems, leave the setting at Disabled for optimal system stability and
performance. But if you are plagued by EMI, setting to Enabled for EMI
reduction. Settings:
Disabled
and
Enabled
.
