Asus P4B SDRAM Configuration [By SPD], SDRAM CAS Latency [3T], SDRAM RAS to CAS Delay [3T], SDRAM RAS Precharge Delay [3T], SDRAM Active Precharge Delay [6T]

SDRAM Configuration [By SPD]

This parameter allows you to set the optimal timings for items 2–5, depending on the memory modules that you are using. The default setting is [By SPD], which configures items 2–5 by reading the contents in the SPD (Serial Presence Detect) device. The EEPROM on the memory module stores critical 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 item controls the latency between the SDRAM read command and the time the data actually becomes available.

The SDRAM CAS Latency parameter appears only when you set the SDRAM Configuration to [User Defined].

SDRAM RAS to CAS Delay [3T]

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

The SDRAM RAS to CAS Delay parameter appears only when you set the SDRAM Configuration to [User Defined].

SDRAM RAS Precharge Delay [3T]

This item controls the idle clocks after issuing a precharge command to the SDRAM.

The SDRAM RAS Precharge Delay parameter appears only when you set the SDRAM Configuration to [User Defined].

SDRAM Active Precharge Delay [6T]

This item controls the number os SDRAM clocks used for SDRAM parameters.

The SDRAM Active Precharge Delay parameter appears only when you set the SDRAM Configuration to [User Defined].

SDRAM Idle Timer [Infinite]

Configuration options: [Infinite] [0T] [8T] [16T] [64T]

4-18 Chapter 4: BIOS Setup