SETUP BIOS .4

Configuration Chip

4. BIOS SETUP

SDRAM RAS Precharge Time

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

SDRAM.

SDRAM Cycle Time (Tras, Trc) [7T, 9T]

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] [7T, 9T]

SDRAM Page Closing Policy [One Bank]

This feature controls that after a page miss whether the Graphics and Memory Controller Hub (GMCH) will issue “precharge only the bank” or “precharge all” command to a specific opened SDRAM bank. Configuration options: [One Bank] [All Banks]

CPU Latency Timer [Enabled]

This controls the GMCH’s response to CPU deferrable cycles. Configuration options: [Disabled] [Enabled]

Command Per Cycle [Enabled]

When onboard VGA is used, CPU can help to gain graphics performance by increasing proper SDRAM cycles combinations. Configuration options: [Enabled] [Disabled]

Video Memory Cache Mode [UC]

USWC (uncacheable, speculative write combining) is a new cache technology for the video memory of the processor. It can greatly improve the display speed by caching the display data. You must set this to UC (uncacheable) if your display card does not support this feature, otherwise the system may not boot. Configuration options: [UC] [USWC]

Graphics Window Size [64MB]

This feature allows you to select the size of mapped memory for AGP graphic data. Configuration options: [64MB] [32MB]

Memory Hole At 15M-16M [Disabled]

This field allows you to reserve an address space for ISA devices that require it. Configuration options: [Disabled] [Enabled]

PCI 2.1 Support [Enabled]

This function allows you to enable or disable PCI 2.1 features including passive release and delayed transaction. Configuration options: [Disabled] [Enabled]

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ASUS TUEG-VM User’s Manual