Advanced chipset features, Dram timing selectable, Cas latency time – Albatron Technology PX845PEV-800 User Manual

Page 31: Active to precharge delay, Dram ras# to cas# delay, Dram ras# precharge, Refresh mode select, System bios cacheable, Video bios cacheable, Delayed transaction

Albatron Anniversary Special Edition PX845PEV-800

Advanced Chipset Features

DRAM Timing Selectable

This item determines DRAM clock/ timing using SPD or manual configuration. Make sure
your memory module has SPD (Serial Presence Data), if you want to select the
option. Options: Manual, By SPD (default).

CAS Latency Time

This item determines CAS Latency. When synchronous DRAM is installed, the number of
clock cycles of CAS latency depends on the DRAM timing. Do not reset this field from the
default value specified by the system designer. Options: 1.5,2,2.5 and By SPD (default).

Active to Precharge Delay

This item allows you to select DRAM Active to Precharge Delay. Options: 7, 6, 5, By SPD
(default).

DRAM RAS# to CAS# Delay

This item allows you to select a delay time between the CAS and RAS strobe signals. It only
applies when DRAM is written to, read from, or refreshed. Options: 3,2 and default is by SPD.

DRAM RAS# Precharge

This item allows you to select the DRAM RAS# precharge time. The ROW address strobe
must precharge again before DRAM is refreshed. An inadequate configuration may result in
incomplete data. Options: 3,2 and By SPD (default).

Refresh Mode Select

Select the refresh mode. Options: 15.6 us, 7.8 us, 64 us, Auto (default).

System BIOS Cacheable

When enabled, accesses to system BIOS ROM addressed at F0000H-FFFFFH are cached,
provided that the cache controller is enabled. Options: Enabled (default), Disabled.

Video BIOS Cacheable

Select “Enabled” to allow caching of the video BIOS which may improve performance. If any
other program writes to this memory area, a system error may result. Options: Enabled,
Disabled (default).

Memory Hole at 15M-16M

When enabled, you can reserve an area of system memory for ISA adapter ROM. When this
area is reserved, it cannot be cached. Refer to the user documentation of the peripheral you are
installing for more information. Options: Disabled (default), Enabled.

Delayed Transaction

The chipset has an embedded 32-bit posted write buffer to support delay transaction cycles.
Select “Enabled” to support compliance with PCI specifications. Options: Disabled, Enabled
(default).

Delay Prior to Thermal

Select the delay time before thermal activation from high temperatures.
Options: 4 Min, 8 Min, 16 Min (default), 32 Min.