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3-3 Advanced Chipset Features
By choosing the [Advanced Chipset Features] option from the CMOS Setup Utility
menu (Figure 3-1), the screen below is displayed. This sample screen contains the
manufacturer's default values for the motherboard.
All of the above settings have been determined by the motherboard
manufacturer and should not be changed unless you are absolutely sure of
what you are doing. Explanation of the DRAM timing and chipset features
setup is lengthy, highly technical and beyond the scope of this manual. Below
are some abbreviated descriptions of the functions in this setup menu.
DRAM Timing Selectable
The function allows you to enable or disable the DRAM timing control by SPD. When
set to Manual, you can select the RAS Precharge Time(tRP), RAS Active Time(tRAS),
RAS to CAS Delay(tRCD), CAS Latency Setting, and DRAM Addr/Cmd Rate.
1. CAS Latency Time
This item controls the latency between DRAM read command and the time the data
actually becomes available.
2. Active to Precharge Delay
This item controls the number of DRAM clocks used for DRAM parameters.
3. DRAM RAS# to CAS# Delay
This item controls the latency between DRAM active command and
read/write command.
4. DRAM RAS# Precharge
This item controls the idle clocks after issuing precharge command to the
DRAM.
Dram Read Thermal Mgmt
Available options: [Disabled] and [Enabled].
System BIOS Cacheable
Enabling this function allows caching of the system BIOS ROM at F0000h-FFFFFh,
resulting in better system performance. However, if any program writes to this memory
area, a system error may result. It is advised to leave this setting. Caching the system
BIOS results in better performance than shadowing the system BIOS.
Video BIOS Cacheable
Enabling this function will allows caching of the video RAM, resulting in better
system performance. However, if any programs write to this memory area, a system
error may occur.
Memory Hole At 15M-16M
Enabling this function will reserve the memory address space between 15MB and
16MB for ISA expansion cards. However, enabling this function will result in not
allowing the system to have access to memory above 16MB. Please note that some
expansion cards require this setting to be enabled. The default setting is Disabled. If
Auto Configuration is enabled, you must set the DRAM timing function to 60ns or
70ns, depending on the type of DRAM you install.
Delayed Transaction
Available options: [Disabled] and [Enabled].
Delay Prior to Thermal
Available options: None, 4, 8, 16, and 32 min.
Chapter 3
Chapter 3
This function determines the amount of system memory that is given to the AGP card.
Options range from 4MB to 256MB. This is a dynamic memory allotment in that the
AGP card will only use the amount of memory that it needs. The remaining memory,
which is not in use, will be available for the system. For example, if 16MB is allotted
to the AGP card and the card only needs 8MB, the remaining 8MB will be available
for system use.
The motherboard manufacturer developed BIOS protection technology that protects
the System BIOS from accidental corruption by unauthorized users or computer
viruses. When enabled, the BIOS data cannot be changed when attempting to update
BIOS with the FLASH utility. When disabled, the BIOS data can be updated by using
the FLASH utility.
3-4 Integrated Peripherals
This section provides information on setting peripheral devices. By choosing the
Integrated Peripherals option from the CMOS Setup Utility menu (Figure 3-1), the
screen below is displayed. This sample screen contains the manufacturer's default
values for the motherboard.
Press [Enter] to enter the sub-menu, which contains the following items for advanced
control:
This section provides information for setting onboard device. By choosing the
Integrated Peripherals option from the CMOS Setup Utility menu (Figure 3-5), the
screen below is displayed. This sample screen contains the manufacturer's default
values for the motherboard
Press [Enter] to enter the sub-menu, which contains the following items for advanced
control:
11
12
AGP Aperture Size
Flash BIOS Protection
OnChip IDE Device
1. On-Chip Primary/Secondary PCI IDE
You can set this to disable the On Chip IDE controller if you are going to add a higher
performance IDE board
2. IDE Primary/Secondary Master/Slave PIO
The four IDE PIO (programmed Input/Output) fields let you set a PIO mode (0-4) for
each IDE device that the internal PCI IDE interface supports. Modes 0 through 4
provide successively increased performance. In Auto mode, the system automatically
determines the best mode for each device.
3. IDE Primary/Secondary Master/Slave UDMA
Ultra DMA implementation is possible only if your IDE device supports it and your
operating environment contains a DMA driver. If both your hard drive and software
support Ultra DMA, select [Auto] to enable BIOS support.
Note: Some CD/DVD devices don't support Ultra DMA mode, please set to Disable.
To avoid some issues after proceeding to operating system.
4. IDE HDD Block Mode
Block mode is also called block transfer, multiple commands, or multiple sector
read/write. If your IDE hard drive supports block mode, select Enabled to auto-detect
the optimal number of block read/writes per sector the drive can support.
OnChip PCI Device
1. AC97 Audio
This feature allows you to enable/disable the on-board AC97 audio function.
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