Via EPIA-ML8000AG User Manual - Page 59

Bank Interleave, Precharge to Active Trp, Active to Precharge Tras, Active to CMD Trcd, DRAM Command

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BIOS Setup 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 buy 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. 3-27

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BIOS Setup
3-27
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 buy 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.