TYAN S2054 User Manual page 44

Chapter 3
BIOS Configuration
The settings are Auto, 2 SCLKs or 3 SCLKs.
SDRAM RAS# Precharge
This option specifies the length of the RAS precharge part of the DRAM
system memory access cycle when SDRAM system memory is installed in this
computer. The settings are Auto (AMIBIOS automatically determines the
optimal delay), 2 SCLKs, or 3 SCLKs.
Graphics Mode Select
This option selects the internal graphics device and the amount of system
memory to be used as video memory. The settings are UMA (Unified Memory
Architecture) 1MB or UMA 512KB.
Display Cache Window Size
This option specifies the amount of cache available for the graphics local
memory window. The settings are 32MB or 64MB.
CPU Freq Select
This option selects the method used to set the CPU frequency. The settings
are Hardware or Software.
CPU Freq Ratio
This option sets the CPU frequency ratio. The settings are 1:2, 1:4, 1:3, 1:5, 2:5,
2:9, 2:7, 2:11, 1:6, 1:8, 1:7, 2:13, 2:15, or 1:2A.
Initialize Display Cache Memory
The settings are Enabled or Disabled. Set this option to Enabled to display
cache memory at system boot. Set this option to Disabled to bypass the
display cache initialization procedure.
Paging Mode Control
This option is only available if the Initialze Display Cache Memory option is
set to Enabled. The settings are Close or Open. Set this option to Open to
open paging mode.
RAS to CAS
This option is only available if the Initialize Display Cache Memory option is
set to Enabled. The settings are Override or Default. If set to Override, the
RAS to CAS delay override is fixed at 2 clocks. If set to Default, the delay is
determined by the CL bit.
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