2-20 Setup and OperationAdvanced Chipset ControlSelect the “Advanced Chipset Control” submenu on the Advanced menu to set PCIparameters.NOTE: A Supervisor password might berequired to select parameters from the AdvancedChipset Control submenu.Use the legend keys to make your selections and exit to the Main menu. See Table Section2-10 to configure your peripherals.CAUTION: Setting items in this menu toincorrect values can cause your system tomalfunction.Table Section 2-10 Advanced Chipset Control ParametersParameter Options Description1 MB Memory Gap at15 MBEnableDisableIf Enabled, turn system RAM off to freeaddress space for use with optionboard. Memory from 15 MB to 16 MBis disabled, creating 1 MB gap insystem RAM.CPU to PCI WriteBufferEnableDisableEnables CPU to PCI Write Buffer,allowing data to be temporarily stored inbuffer before writing data.PCI to DRAM WriteBufferEnableDisableEnables PCI to DRAM Write Buffer,allowing data to be temporarily stored inbuffer before writing data.CPU to DRAM WriteBufferEnableDisableEnables CPU to DRAM Write Buffer,allowing data to be temporarily stored inbuffer before writing data.PCI Memory BurstCyclesEnableDisableEnables PCI memory burst write cycles.Latency Timer Value A0 through F020 through 90Sets maximum number of PCI busclocks that PCMC may burst as amaster.CAS# Before RAS#RefreshEnableDisableIf Enabled, the PCMC uses CAS#before RAS# timing to refresh DRAMarray. If Disabled, RAS# only refreshis used.Burst of 4 Refresh EnableDisableIf Enabled, refreshes are performed insets of four at a frequency of 1/4 ofnormal refresh rate. If Disabled, singlerefreshes occur at 15.6 ms refresh rate.
