Asus A7A266 4.4.1Chip Configuration, NOTE:, 4. BIOS SETUP, SDRAM CAS Latency, SDRAM Configuration, SDRAM RAS to CAS Delay, SDRAM RAS Precharge Time

4.BIOS SETUP

4.4.1Chip Configuration

SDRAM Configuration [By SPD]

This sets the optimal timings for items 4-7, depending on the memory modules that you are using. The default setting [By SPD] configures items 4-7 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 Define] [By SPD]

NOTE: The following 3 fields will only be adjustable when SDRAM Configuration is set to [User Define].

SDRAM CAS Latency

This controls the latency between the SDRAM read command and the time that the data actually becomes available.

SDRAM RAS to CAS Delay

This controls the latency between the SDRAM active command and the read/write command.

SDRAM RAS Precharge Time

This controls the idle clocks after issuing a precharge command to the

SDRAM.

SDRAM Cycle Time (Tras, Trc) [6T, 8T]

This feature controls the number of SDRAM clocks used for SDRAM parameters Tras and Trc. Tras specifies the minimum clocks required between active command and precharge command. Trc specifies the minimum clocks required between active command and re-active command. Configuration options: [5T, 7T] [6T, 8T]

Chip Configuration

4. BIOS SETUP

ASUS A7A266 User’s Manual 63