Abit BD7-E User Manual page 42

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Act to Precharge Delay:
This item controls the number of DRAM clocks used for the DRAM parameters.
DRAM RAS# to CAS# Delay
This item controls the latency between the DRAM active command and the read/write command.
DRAM RAS# Precharge:
This item controls the idle clocks after issuing a precharge command to the DRAM.
DRAM Data Integrity Mode:
Two options are available: ECC and Non-ECC. The default setting is Non-ECC. This option is used to
configure the type of DRAM in your system. ECC is "Error Checking and Correction". Choose the ECC
option only when your memory is ECC type.
DRAM Read Thermal Mgmt:
This option enables or disables the "Dram Read Thermal Management".
System BIOS Cacheable:
When set to [Enabled], accesses to the system BIOS ROM addressed at F0000H-FFFFFH are cached,
provided that the cache controller is enabled. The larger the range of the Cache RAM, the higher the
efficiency of the system will be.
Video BIOS Cacheable:
As with caching the system BIOS, enabling the Video BIOS cache will allow access to video BIOS
addressed at C0000H to C7FFFH to be cached, if the cache controller is also enabled. The larger the
range of the Cache RAM, the faster the video performance will be.
Memory Hole At 15M-16M:
When set to [Enabled], the memory address space at 15M-16M will be reserved for ISA expansion cards
that specifically requires this setting. This makes the memory from 15MB and up unavailable to the
system. Leave this item to its default setting.
Delayed Transaction:
Two options are available: Enabled and Disabled. The default setting is Disabled. Set the option to
enabled or disabled PCI 2.1 features including passive release and delayed transaction for the chipset.
This function is used to meet the latency of PCI cycles to or from the ISA bus. This option must be
enabled to provide PCI 2.1 compliance. If you have an ISA card compatibility problem, you can try to
enable or disable this option for optimal results.
Delay Prior to Thermal:
This item selects the delay time before thermal activation.
AGP Aperture Size:
This option specifies the amount of system memory that can be used by the AGP device. The aperture is a
portion of the PCI memory address range dedicated for graphics memory address space.
BD7-E
Chapter 3