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Chapter 3
SD7-533 Motherboard
3-16
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Timing Constraint Cntl:
Two options are available: Slow ) Normal. The default setting is Slow. Timing Constraint Control
on DDR SDRAM Back-to-Back write Commands which are issued to different ranks.
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GW Write Mask AGP Request (Graphic Window Write Mask AGP Request):
Two options are available: Enabled ) Disabled. 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.
CAS Latency Setting:
Three options are available: 2T ) 2.5T ) 3T. The default setting is 2.5T. You can select SDRAM CAS
(Column Address Strobe) latency time according your SDRAM specification.
Prefetch Caching:
Two options are available: Disabled or Enabled. The default setting is Disabled. This item controls the
prefetch caching for PCI slave control.
Memory Hole at 15M-16M:
Two options are available: Disabled or Enabled. The default setting is Disabled. This option is used to
free up the memory block 15M-16M. Some special peripherals need to use a memory block located
between 15M and 16M. We recommend that you disable this option.
AGP Aperture Size:
Seven options are available: 4MB ) 8MB ) 16MB ) 32MB ) 64MB ) 128MB ) 256MB )Back
to 4MB. 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.
Graphic Window WR Combin:
Two options are available: Disabled or Enabled. The default setting is Enabled. This register defines the
starting address of the graphic windows for GUI (Graphic Unit Interface), you can enable or disable this
register. It also affect by the Graphic Window Control Register, this register controls accessibility and
effectiveness of this register.
The Graphic Window Control Register specifies the size of the graphic window and indicates that
whether the Graphic Windows Base Address (GWBA) Register and Re-mapping GART Base Address
Register contain valid information or not. It also controls the accessibility of GWBA register.