Advanced Chipset Features - CHAINTECH 9BJA3 User Manual

APIC Mode
This item can enable or disable the APIC (Advanced Programmable Interrupt
Controller). Due to compliance to PC2001 design guide, the system is able to run in
APIC mode. Enabling APIC mode will expand available IRQs resources for the
system. Available options are [Enabled] and [Disabled].
MPS Version Control For OS
This item allows you to select which MPS (Multi-Processor Specification) version
to be used for the operating system. You need to select the MPS version which is
supported by your operating system. To find out which version to use, consult the
vendor of your operating system. Available options are [1.4] and [1.1].
OS Select (For DRAM >64MB)
If your system's DRAM is larger than 64MB and you are running OS/2, select OS/2
as the item value. Otherwise, set the item value to Non-OS/2 for all other operating
systems.
Small Logo(EPA) Show
This setup allows photo that is EPA. Logo.
HDD Instant Recover
This board supports HDD Instant Recover, Select enabled to use the function. Upon
system boot up, the HDD Instant Recover Utility will be shown on the screen. Select
enable or disable to continue booting.
Show POST CODE
Enabling this function can show POST error code on the screen before proceeding to
operating system.

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.
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Chapter 3
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.
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.
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