Abit SR7-8X, User Manual

Page: 64 / 114

Chapter 4
SR7-8X
4-16
DDR Write Recovery Time:
Three options are available: 1T 2T 3T. The default setting is 2T . This item is to set SDR/DDR
SDRAM write recovery time. This item (bit) controls the number of clock cycles that must occur from
the last valid write operation to the earlist time a new Precharge command can be asserted to the same
bank. When you set it to
1T , tWR duration is 1 clock cycle, etc.
Timing Constraint Control:
Two options are available: Fast Normal. The default setting is Normal . Timing Constraint Control
on DDR SDRAM Back-to-Back write Commands which are issued to different ranks.
GW Write Mask AGP Request:
Two options are available: Disabled Enabled. The default setting is Enabled . When you set to
Enabled , a graphic window write operation will forbid AGP device to access memory until this write
operation is finished. When set to Disabled , AGP request can access memory as usual.
MA Delay 1T/2T Select:
Three options are available: Auto MA 2T MA 1T. The default setting is Auto . This item will effect
the memory address read/write speed, MA 1T will be the fast selection.
Back to Advanced Chipset Features Setup Menu Here:
Advanced Read Prefetch:
Two options are available: Disabled or Enabled. The default setting is Enabled . This item controls the
prefetch caching for PCI slave control, Select Enable will increase the system performance.
AGP Capability:
Two options are available: 4X 2X. The default setting is 4X . If you use the older AGP adapter that
does not support AGP 4X mode, you need to set this item to 2X. You can check your AGP adapter user’s
manual to know what kind of AGP mode it can support. If you use the 8X AGP adaptor, the item will
change to 8X 4X.
AGP Fast Write:
Two options are available: Disabled or Enabled. The default setting is Disabled . If your AGP adapter can
support this function, then you can choose Enabled . Otherwise, choose Disabled . Enabling this item can
improve your system performance, but it may also decrease system compatibility.
AGP Aperture Size:
Up to seven options are available: 4MB 8MB 16MB 32MB 64MB 128 MB 256 MB.
The default setting is
64MB . 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. Host cycles that hit the aperture range are forwarded to the AGP without any translation.
See
http://www.agpforum.org for AGP information.