MSI 845E Neo-V User Manual page 53

MS-6566E ATX Mainboard
late its charge before DRAM refresh, refresh may be incomplete and DRAM
may fail to retain data. This item applies only when synchronous DRAM is
installed in the system. Available settings: [2 clocks], [3 clocks].
SDRAM RAS# to CAS# Delay
When DRAM is refreshed, both rows and columns are addressed separately.
This setup item allows you to determine the timing of the transition from RAS
(row address strobe) to CAS (column address strobe). The less the clock
cycles, the faster the DRAM performance. Setting options: [3 clocks], [2
clocks].
SDRAM Precharge Delay
This setting controls the precharge delay, which determines the timing delay
for DRAM precharge. Settings: [5 clocks], [6 clocks], [7 clocks].
AGP Aperture Size
This setting controls just how much system RAM can be allocated to AGP for video
purposes. The aperture is a portion of the PCI memory address range dedicated to
graphics memory address space. Host cycles that hit the aperture range are for-
warded to the AGP without any translation. The option allows the selection of an
aperture size of [4MB], [8MB], [16MB], [32MB], [64MB], [128MB], and [256 MB].
SDRAM Idle Timer
Select the amount of time in HCLKs that the DRAM controller waits to close a DRAM
page after the CPU becomes idle.
DRAM Integrity Mode
Select Parity or ECC (error-correcting code), according to the type of installed DRAM.
Memory Hole
In order to improve performance, certain space in memory can be reserved for ISA
peripherals. This memory must be mapped into the memory space below 16MB. When
this area is reserved, it cannot be cached. Settings: [Disabled], [15MB-16MB].
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