Chip Configuration - Asus A7S-VM User Manual

4. BIOS SETUP

4.4.1 Chip Configuration

SDRAM Configuration [By SPD]
This sets the optimal timings for items 2–4, depending on the memory
modules that you are using. The default setting is [By SPD], which configures
items 2–4 by reading the contents in the SPD (Serial Presence Detect) device.
The EEPROM on the memory module stores critical parameter information
about the module, such as memory type, size, speed, voltage interface, and
module banks. Configuration options: [User Defined] [By SPD]
SDRAM CAS Latency [3T]
This controls the latency between the SDRAM read command and the time
that the data actually becomes available. NOTE: This field is configurable
only when you set the SDRAM Configuration to [User Defined].
SDRAM RAS to CAS Delay [3T]
This controls the latency between the SDRAM active command and the
read/write command. NOTE: This field is configurable only when you set
the SDRAM Configuration to [User Defined].
SDRAM RAS Precharge Time [3T]
This controls the idle clocks after issuing a precharge command to the
SDRAM. NOTE: This field is configurable only when you set the SDRAM
Configuration to [User Defined].
58 ASUS A7S-VM User's Manual