Intel D845HV Product Specification - Page 97

Extended Configuration Submenu

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BIOS Setup Program 4.2.1 Extended Configuration Submenu To access this submenu, select Maintenance on the menu bar and then Extended Configuration. Maintenance Main Advanced Security Extended Configuration Power Boot Exit The submenu represented by Table 61 is for setting video memory cache mode. This submenu becomes available when User Defined is selected under Extended Configuration. Table 61. Extended Configuration Submenu Feature Options Description Extended Configuration Video Memory Cache Mode • Default (default) • User Defined • USWC • UC (default) SDRAM Auto-Configuration CAS# Latency • Auto (default) • User Defined • 3 • 2 • Auto (default) User Defined allows setting memory control and video memory cache mode. If selected here, will also display in the Advanced Menu as: "Extended Menu: Used." Selects Uncacheable Speculative Write-Combining (USWC) video memory cache mode. Full 32 byte contents of the Write Combining buffer are written to memory as required. Cache lookups are not performed. Both the video driver and the application must support Write Combining. Selects UnCacheable (UC) video memory cache mode. This setting identifies the video memory range as uncacheable by the processor. Memory writes are performed in program order. Cache lookups are not performed. Well suited for applications not supporting Write Combining. Sets extended memory configuration options to Auto or User Defined. Selects the number of clock cycles required to address a column in memory. SDRAM RAS# to CAS# Delay SDRAM RAS# Precharge • 3 • 2 • Auto (default) • 3 • 2 • Auto (default) Selects the number of clock cycles between addressing a row and addressing a column. Selects the length of time required before accessing a new row. SDRAM RAS# Active to Precharge • 7 • 6 • 5 • Auto (default) Corresponds to tRAS. 97

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BIOS Setup Program
97
4.2.1
Extended Configuration Submenu
To access this submenu, select Maintenance on the menu bar and then Extended Configuration.
Maintenance
Main
Advanced
Security
Power
Boot
Exit
Extended Configuration
The submenu represented by Table 61 is for setting video memory cache mode.
This submenu
becomes available when User Defined is selected under Extended Configuration.
Table 61.
Extended Configuration Submenu
Feature
Options
Description
Extended Configuration
•
Default
(default)
•
User Defined
User Defined allows setting memory control and video
memory cache mode.
If selected here, will also display in
the Advanced Menu as:
“Extended Menu:
Used
.”
Video Memory Cache Mode
•
USWC
•
UC (default)
Selects Uncacheable Speculative Write-Combining
(USWC) video memory cache mode.
Full 32 byte contents
of the Write Combining buffer are written to memory as
required.
Cache lookups are not performed.
Both the
video driver and the application must support Write
Combining.
Selects UnCacheable (UC) video memory cache mode.
This setting identifies the video memory range as
uncacheable by the processor.
Memory writes are
performed in program order.
Cache lookups are not
performed.
Well suited for applications not supporting
Write Combining.
SDRAM Auto-Configuration
•
Auto
(default)
•
User Defined
Sets extended memory configuration options to
Auto
or
User Defined
.
CAS# Latency
•
3
•
2
•
Auto
(default)
Selects the number of clock cycles required to address a
column in memory.
SDRAM RAS# to CAS#
Delay
•
3
•
2
•
Auto
(default)
Selects the number of clock cycles between addressing a
row and addressing a column.
SDRAM RAS# Precharge
•
3
•
2
•
Auto
(default)
Selects the length of time required before accessing a
new row.
SDRAM RAS# Active to
Precharge
•
7
•
6
•
5
•
Auto
(default)
Corresponds to tRAS.