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ASUS TXP4 User’s Manual44
(Chipset Features)
IV. BIOS SOFTWARE
IV. BIOS
(Chipset Features)
SDRAM CAS# Latency (3T)
If you use ASUS SDRAM DIMM modules, you can set this to 2T for better perfor-
mance, otherwise leave on default or check with your vendor for DIMM specs.
SDRAM Speculative Read (Disabled)
If Enabled, the CPU will issue predict commands to access the DRAM, if a miss
occurs, the CPU will cancel this command. Some operating systems under certain
situations have a problem utilizing this feature so it is normally Disabled.
Passive Release (Enabled)
This is a mechanism that allows concurrency of ISA/EISA cycles and CPU-to-PCI
cycles. When this feature is enabled, the TXC will be possible to re-arbitrate PCI
bus and allow the CPU to access PCI even when the PCEB has been granted the bus.
Delayed Transaction (Disabled)
If Enabled, this frees the PCI Bus during CPU accessing of 8-bit ISA cards which
normally consume about 50-60 PCI Clocks without PCI delayed transaction. If PCI
Bus Masters cannot use the PCI Bus, leave this on the default setting of Disabled for
some ISA cards that are not PCI 2.1 compliant.
16-bit I/O Recovery Time (1 BUSCLK)
Timing for 16-bit ISA cards
8-bit I/O Recovery Time (1 BUSCLK)
Timing for 8-bit ISA cards
Video BIOS Cacheable (Enabled)
Allows the Video BIOS to be cached to allow faster execution. Leave on default
setting of Enabled for better performance, otherwise Disabled.
Memory Hole at Address (None)
This features reserves either 14MB-16MB or 15MB-16MB memory address space to
ISA expansion cards that specifically require this setting. Memory from 14MB and up
or 15MB and up will be unavailable to the system because expansion cards can only
access memory up to 16MB.
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Onboard FDC Controller (Enabled)
When enabled, this field allows you to connect your floppy disk drives to the on-
board floppy drive connector instead of a separate controller card. If you want to use
a different controller card to connect the floppy drives, set this field to Disabled.
Onboard FDC Swap A: B: (No Swap)
This field allows you to reverse the hardware drive letter assignments of your floppy
disk drives. Two options are available: Swap AB and No Swap (default). If you want
to switch drive letter assignments, set this field to Swap AB, and the swap will be
controlled by the onboard chipset.