User Guide

Introducing the BIOS
User’s Manual
4-15
Figure 4-5B. Advanced DRAM Control Setup Menu Screen Shot
DRAM CAS# Latency:
Three options are available: 2T ( 2.5T ( 3T. The default setting is 2.5T. You can select SDRAM CAS
(Column Address Strobe) latency time according your SDRAM specification.
Timing Setting Mode:
Six options are available: Safe ( Normal ( Fast ( Turbo ( Ultra ( Manual. The default setting is
Normal. If you choose the Manual, the following items will be available.
 DDR RAS Precharge Time:
Three options are available: 2T ( 3T ( 4T. The default setting is 3T. This item is to set SDR/DDR
SDRAM RAS precharge time. It can define the SDRAM precharge to ACT command period.
tRP timing value (Precharge time – time from precharge command to when back can be activated).
 DDR RAS to CAS Delay:
Three options are available: 2T ( 3T ( 4T. The default setting is 3T. This item is to set SDR/DDR
SDRAM RAS to CAS delay. It can define the SDRAM ACT to Read/Write command period.
tRCD timing value = RAS to CAS latency + rd/wr command delay