Little Board/P5x Technical Manual
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Setup 4 — Chipset Features Setup
Setup 4 — Chipset Features Setup controls internal chipset feature s. The OEM or end user
should never change many of these items, as they specify internal parameters that have
been chosen to support the existing motherboard design. Change these parameters only if
directed to by Ampro Technical Support. Figure 2– 9 shows what can be configured on Setup 4. The
items that can be changed by the OEM are listed below.
Chipset Features Setup
Ampro Computers, Inc.
Auto Configuration : Enabled
DRAM Timing : 70ns
DRAM Leadoff Timing : 10/6/4
DRAM Read Bursts (EDO/FP) : x333/x444
DRAM Write Burst Timing : x333
Fast EDO Lead Off : Disable
Refresh RAS# Assertion : 5 Clocks
Fast RAS To CAS Delay : 3
DRAM Page Idle Timer : 2 Clocks
DRAM Enhanced Paging : Enabled
Fast MA to RAS# Delay : 2 Clocks
SDRAM (CAS Lat/RAS-to-CAS) : 3/3
SDRAM Speculative Read : Disabled
System BIOS Cacheable : Disabled
Video BIOS Cacheable : Disabled
8-bit I/O Recovery Time : 1
16-Bit I/O Recovery Time : 2
Turn on CPU Fan : 40°C/104°F
Current CPU Temperature : 68°C/154°F
Memory Hole At 15M-16M : Disabled
PCI 2.1 Compliance : Disabled ESC:Quit ↑ ↓ → ← : Select Item
F1 :Help PU/PD/+/- : Modify
F5 :Old Values (Shift)F2:Color
F6 :Load BIOS Defaults
F7 :Load Setup Defaults
Figure 2– 9. Setup 4 — Chipset Features Setup
This Setup screen allows you to configure the following parameters:
! Auto Configuration — if enabled, the DRAM timing selection of 70 nS or 60 nS automatically
configures the following five RAM timing parameters. If disabled, these parameters must be
configured manually. This option should be left in its default state. Contact Ampr o Tech nical
Support or your Ampro Sales Representative for advice if you have unique requirements that
require changing these parameters.
! System and Video BIOS Cacheable — these options allow BIOS code to be cached in the
CPU.
! 8- and 16-Bit I/O Recovery Time — these options allow additional delays to be inserted
between PCI-initiated I/O transactions to the ISA bus. Options are 1 to 8 clo cks, or N A, for now
additional delays.
! Memory Hole at 15M-61M — certain peripheral adapters may require memory in the 15M-
16M address range for expansion ROM use. The memory hole option creates a 1 MB memory
hole below the 16 M boundary for this purpose.