VIA Technologies EPIA-ML, User Manual

Page: 61 / 71

BIOS Setup
53
Bank Interleave
Set the interleave mode of the SDRAM interface. Interleaving allows banks of
SDRAM to alternate their refresh and access cycles. One bank will undergo
its refresh cycle while another is being accessed. This improves performance
of the SDRAM by masking the refresh time of each bank. This field is only
available when “DRAM Timing” is set to “Manual”. Settings: Disabled, 2 Bank,
4 Bank
Precharge to Active (Trp)
This field controls the length of time it takes to precharge a row in the
memory module before the row becomes active. Longer values are safer but
may not offer the best performance. This field is only available when “DRAM
Timing” is set to “Manual”. Settings: 2T, 3T
Active to Precharge (Tras)
This field controls the length of time it a row stays active before precharging.
Longer values are safer but may not offer the best performance. This field is
only available when “DRAM Timing” is set to “Manual”. Settings:
5T, 6T
Active to CMD (Trcd)
This field is only available when “DRAM Timing” is set to “Manual”. Settings:
2T, 3T
DRAM Command Rate
This field controls how fast the memory controller sends out commands.
Lower setting equals faster command rate. Please note that some memory
modules may not be able to handle lower settings. Settings: 2T Command,
1T Command
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.