DFI G486-EVB User manual

G486-EVB
Rev.A
System Board
User’s Manual
-D24341209-

vCopyright1994,byDFIInc.
All rights reserved.
No part of this document may be copied or reproduced
in any form or by any means without the prior written
consent of DFI, Inc.
DFI, Inc. makes no warranties with respect to this
documentation and disclaims any implied warranties of
merchantability, quality, or fitness for any particular
purpose. The information in this document is subject to
change without notice. DFI, Inc. reserves the right to
make revisions to this publication and to make changes
to any and/or all parts of its content, at any time,
without obligation to notify any person or entity of such
changes. Further, DFI, Inc. assumes no responsibility
for any errors that may appear in this document.
DFI is a registered trademark, and G486-EVB is a
trademark of Diamond Flower, Inc. All other product
names mentioned are trademarks or registered trade-
marks of their respective companies.

vFCCStatementonClassB
This equipment has been tested and found to comply
with the limits for a Class B digital device, pursuant to
Part 15 of the FCC rules. These limits are designed to
provide reasonable protection against harmful interfer-
ence when the equipment is operated in a residential
installation. This equipment generates, uses, and can
radiate radio frequency energy and if not installed and
used in accordance with the instruction manual may
cause harmful interference to radio communications.
However, there is no guarantee that interference will
not occur in a particular installation. If this equipment
does cause harmful interference to radio or television
reception, which can be determined by turning the
equipment off and on, the user is encouraged to try to
correct the interference by one or more of the following
measures:
•Reorient or relocate the receiving antenna.
•Increase the separation between the equipment and
the receiver.
•Connect the equipment into an outlet on a circuit
different from that to which the receiver is
connected.
•Consult the dealer or an experienced radio TV
technician for help.
Notice:
1. The changes or modification not expressly approved
by the party responsible for compliance could void
the user’s authority to operate the equipment.
2. Shielded interface cables must be used in order to
comply with the emission limits.

v Table of Contentsv
Introduction .................................................................................
Features and Specifications .................................................
Installation Overview .................................................................
Preparing the Area ................................................................
Handling the System Board ..................................................
Tips in Handling the System Board ...............................
Hardware Installation.............................................................
Memory Installation .........................................................
Installing the Modules ..............................................
Board Configuration ...............................................................
Jumper Settings ..............................................................
Locations of Jumpers JP3 and JP15 .....................
Jumper Settings for VL-Bus Add-on Boards .........
Jumper Settings for Light and Deep Green ...........
Cache Configuration .......................................................
Jumper Settings for Cache Memory ......................
CPU Installation and Upgrade .......................................
Jumper Settings for CPUs ......................................
Installing Upgrade CPUs ........................................
Installing the System Board ..................................................
Initial Setup Program .................................................................
Award BIOS CMOS Setup Utility ..........................................
Standard CMOS Setup ...................................................
BIOS Features Setup .....................................................
Chipset Features Setup .................................................
Power Management Setup ............................................
Load BIOS Defaults ........................................................
Load Setup Defaults .......................................................
Password Setting ............................................................
IDE HDD Auto Detection ................................................
Save and Exit Setup .......................................................
Exit Without Saving ........................................................
1-1
1-2
2-1
2-1
2-2
2-2
2-2
2-2
2-4
2-5
2-6
2-6
2-8
2-10
2-11
2-13
2-14
2-15
2-20
2-25
3-1
3-2
3-2
3-5
3-7
3-8
3-9
3-9
3-10
3-11
3-14
3-14

Troubleshooting ...........................................................................
Appendix A: Types of Modules .................................................
Appendix B: System Error Report ............................................
Appendix C: Memory and I/O Maps ..........................................
Appendix D: 16-Bit ISA I/O Pin Assignments ..........................
Appendix E: VL-Bus I/O Pin Assignments ...............................
Appendix F: Connector Pin Assignments ...............................
Appendix G: Award BIOS Hard Disk Table .............................
4-1
A-1
B-1
C-1
D-1
E-1
F-1
G-1

EnergyStarCompliantSystemBoard
1-1 uIntroduction
vIntroduction
The G486-EVB is an Energy Star Compliant system
board that meets the Environmental Protection Agency’s
Green PC requirements. It reduces energy consumption
to 15 Watts or less by automatically turning off periph-
erals or the entire system, when not in use.
The G486-EVB accommodates all of the Intel 486
family of CPUs including the energy saving SL En-
hanced CPUs. The system board may be equipped with
an 80486SX or 80486DX at 25/33 MHz, an 80486DX2
at 50/66 MHz, and, when equipped with optional 3.3V
support, an 80486DX4 at 75/100 MHz. It will also
support the Intel486 OverDrive Processor, AMD
486DXL low power processor, Cyrix Cx486DX/DX2
and Cx486S/S2 CPUs.
The G486-EVB uses 256K x 36, 1M x 36 and 4M x 36
HSIM modules. The memory can be configured to six
different sizes from 1MB to 64MB. In addition, the
G486-EVB is equipped with three 32-bit VESA
VL-Bus, and six 16-bit and one 8-bit ISA expansion
slots.

G486-EVB
Features and Specifications
•Microprocessor
Intel 486SX-25/33, 486DX-33, 486DX2-50/66,
SL Enhanced CPUs, Intel486TM DX2
OverDrive Processor,
80486DX4-75/100 (with optional 3.3V support)
AMD 486DXL low power CPU
Cyrix Cx486S-25/33, Cx486S2-50/66,
Cx486DX-25/33 and Cx486DX2-50/66
•Energy-Efficient Design
Intel SL Enhanced CPU ready
Supports system power management
Supports CPU stopped clock
Supports optional external power management
switch
Supports power saving video mode
•Chipset
EC802G: system and cache controller
EC100: data buffer
•BIOS
Award system BIOS
•Cache Memory
128K, 256K or 512K
Supports direct map write-back or write-through
cache subsystem
•Memory Onboard
1MB to 64MB
Introduction u1-2

EnergyStarCompliantSystemBoard
•DRAM Type
256K x 36, 1M x 36 and 4M x 36 HSIMMs
•Slots
Three VESA VL-Bus slots
Six 16-bit ISA slots
One 8-bit ISA slot
•Power Management
Flexible Doze mode, Standby mode and Suspend
mode transitions using SMM type of CPUs and
SMM software handler.
Built-in hardware auto-transition mechanism.
Microsoft APM supported.
•PCB
4 layers
1-3 uIntroduction
PackageChecklist
The G486-EVB package contains the following items:
•The G486-EVB system board
•One G486-EVB user’s manual
If either of these items is missing or damaged, please
contact your dealer or sales representative for assistance.

G486-EVB
Installation Overview u2-1
vInstallation Overview
This chapter summarizes the steps in installing the
G486-EVB system board into your system unit. It also
includes a description of the area in which you must
work and directions for memory installation. Before
installing the system board, obtain the memory you plan
to install. Please refer to the memory chart on page 2-3
for the number and type of HSIM modules needed.
Preparing the Area
Before unpacking the system board, make sure the
location you have selected is relatively free of dust and
static. Excessive exposure to dust, static electricity,
direct sunlight, excessive humidity, extreme cold and
water can damage the operational capabilities of your
system board. Avoid soft surfaces such as beds and
carpeted floors which can hinder air circulation. These
areas also attract static electricity which can damage
some circuits on your system board.
Be sure that the power source has a properly grounded,
three-pronged socket. It is essential that the power
connection be properly grounded for correct functioning
of your system board. For further protection, we recom-
mend that you use a surge protection socket. This will
protect the system board from damage that may result
from a power surge on the line.
Move items that generate magnetic fields away from your
system board, since magnetic fields can also damage your
system board. Once you have selected the ideal location,
unpack the G486-EVB system board carefully.

EnergyStarCompliantSystemBoard
Handling the System Board
It is quite easy to inadvertently damage your system
board even before installing it in your system unit.
Static electrical discharge can damage computer compo-
nents without causing any signs of physical damage.
You must take extra care in handling the system board
to ensure that no static build-up is present.
Tips in Handling the System Board
1) To prevent electrostatic build-up, leave the board in
its anti-static bag until you are ready to install it.
2) Do all preparation work on a static-free surface with
components facing up.
3) Hold the system board by its edges only. Be careful
not to touch any of the components, contacts or
connections, especially gold contacts on the board.
4) Avoid touching the pins or contacts on all modules
and connectors. Hold modules and connectors by
their edges.
Hardware Installation
Memory Installation
The G486-EVB system board can support 1MB to
64MB of memory using HSIMM. HSIMM is an acro-
nym for High Density Single In-line Memory Module.
A HSIMM consists of RAM chips soldered onto a small
circuit board. A HSIMM connects to the system board
via a 72-pin card-edge connector.
2-2 uInstallation Overview

G486-EVB
The HSIMM sockets are divided into four banks on the
system board. The G486-EVB system board uses
256K x 36, 1M x 36 and 4M x 36 HSIM modules.
A list of tested memory brands and speeds is given in
Appendix A.
You will need 1 to 4 pieces of HSIM modules, depend-
ing on the amount of memory you intend to install.
Your system board can be configured with 1MB, 4MB,
8MB, 16MB, 32MB or 64MB of onboard memory.
When installing the HSIM modules, populate Bank 0
first followed by Bank 1 and so on. Failure to do so will
cause the system board to work improperly.
The following table summarizes the bank locations and
modules needed for the corresponding memory sizes.
Each bank consists of one HSIMM socket.
Installation Overview u2-3
Bank 3
-
256K x 36
-
-
1M x 36
-
-
4M x 36
Bank 2
-
256K x 36
-
-
1M x 36
-
-
4M x 36
Bank 1
-
256K x 36
-
1M x 36
1M x 36
-
4M x 36
4M x 36
Bank 0
256K x 36
256K x 36
1M x 36
1M x 36
1M x 36
4M x 36
4M x 36
4M x 36
Memory Size
1MB
4MB
4MB
8MB
16MB
16MB
32MB
64MB

EnergyStarCompliantSystemBoard
2-4 uInstallation Overview
Locations of the HSIMM Sockets on the G486-EVB System Board
EC802G
EC100G
Bank 3
Bank 2
Bank 1
Bank 0
Pin1 ofthe HSIMMsocket
Installing the Modules
HSIMMs simply snap into a socket on the system board.
Pin 1 of the HSIMM must correspond with Pin 1 of the
socket.

G486-EVB
Installation Overview u2-5
1. Position the HSIM module above the socket with the
“notch” in the module aligned with the “key” on the
socket.
2. Seat the module at an angle into the bank. Make
sure it is completely seated. Tilt the module upright
until it locks in place in the socket.
Board Configuration
The G486-EVB is designed with jumpers to configure
the board. Make sure that the jumpers are set correctly
before installing the system board into your system unit.
Locations of Jumpers and Connectors
on the G486-EVB System Board
JP3
JP20
JP21
JP22JP23
JP24
EC802G
JP25
JP18EC100G
JP19JP26
JP27JP28
JP29JP30
JP31S3
S1
S2
JP32
JP37
JP36
JP50JP51
JP49
JP38
D6
JP40
JP41
JP44
JP45
JP17
JP15
JP14JP10

EnergyStarCompliantSystemBoard
2-6 uInstallation Overview
Jumper Settings
Locations of Jumpers JP3 and JP10
Locations of Jumpers JP3 and JP10
on the G486-EVB System Board
EC802G
EC100G
JP3
JP10
Jumper JP3
Internal Battery Select
The G486-EVB comes with an internal battery. If you
wish to install an external battery, set JP3 pins 1 and 2
to On.

G486-EVB
Installation Overview u2-7
321
2-3On:
InternalBatteryEnabled
321
1-2On:
ExternalBatteryEnabled
(Default)
Note:
If you enable the external battery, you must connect an
external battery to connector JP14 or your system will
lose its CMOS settings when powered off.
Jumper JP10
EPROM Type
Jumper JP10 should be set to match the type of EPROM
installed on the G486-EVB system board.
On:FlashEPROM28F010Off:EPROM27512
(Default)
The jumper below is for factory testing only and should
always be set to its default configuration. Reconfiguring
this jumper will cause problems with your G486-EVB
system board.
Jumper JP15 - On

EnergyStarCompliantSystemBoard
Jumper Settings for VL-Bus Add-on Boards
Locations of Jumpers JP50 and JP51
on the G486-EVB System Board
JP50JP51
2-8 uInstallation Overview
EC802G
EC100G

G486-EVB
Jumper JP50
High Speed Mode for VL-Bus Board
Set Jumper JP50 to Off only if the VESA VL-Bus
add-on board(s) installed in the VL-Bus slots support
Zero Wait State. If you are not sure that your add-on
board(s) support Zero Wait State, set JP50 to On;
otherwise, a system error may occur.
On:WriteOneWaitState
(Default)Off:WriteZeroWaitState
Jumper JP51
CPU Speed for VL-Bus Board
If a VL-Bus board is installed in the G486-EVB system
board, Jumper JP51 must be set to On if the CPU speed
is greater than 33MHz. Set JP51 to Off if the CPU
speed is less than or equal to 33MHz.
On:CPUSpeed>33MHz
(Default)Off:CPUSpeed<=33MHz
Installation Overview u2-9

EnergyStarCompliantSystemBoard
Jumper Settings for Light and Deep Green
2-10 uInstallation Overview
JP38
Location of Jumper JP38 on the G486-EVB System Board
Jumper JP38
Light/Deep Green Select
The different types of CPUs supported by the
G486-EVB allow you to select from two different
energy saving modes. If you have a standard Intel
486DX, SX, OverDrive Processor or AMD 486DXL,
the G486-EVB will run in Light Green mode. If you
have an energy saving SL Enhanced Intel 486DX,
486DX4 or Cyrix Cx486S/Cx486S2 CPU, then the
G486-EVB will run in Deep Green mode. Set Jumper
JP38 according to the type of CPU installed on the
board.
EC802G
EC100G

G486-EVB
Installation Overview u2-11
Cache Configuration
The G486-EVB system board can be configured to three
different cache sizes: 128KB, 256KB and 512KB.
128KB of cache memory is the default size. Either
32K x 8 (20ns) or 128K x 8 (20ns) SRAM chips are
used for cache depending on the size of cache desired.
One 8K x 8 or 32K x 8 (20ns) SRAM is needed for tag
RAM to store the cacheable addresses (refer to the table
below). The location of the SRAM sockets on the
system board is shown on the next page.
Cache SizeU18/U19/U20/U21U23/U24/U25/U26U22
128KB*32K x 8 (20ns)None8K x 8 (20ns)
256KB32K x 8 (20ns)32K x 8 (20ns)32K x 8 (20ns)
512KB128K x 8 (20ns)None32K x 8 (20ns)
On:LightGreen
486DX,486SX,
Intel486TM OverDrive
Processor,AMD486DXL
Off:DeepGreen
SLEnhancedIntel486TM DX,486DX4,
CyrixCx486S/Cx486S2
(Default)
*Default setting

EnergyStarCompliantSystemBoard
2-12 uInstallation Overview
Note:
When the G486-EVB is equipped with 128KB cache,
cacheable memory is limited to 32MB. Any memory
over 32MB will be non-cacheable. When the system
board is installed with 256K cache, it only supports a
maximum of 48MB onboard memory. If 512K cache is
installed, it will support up to 64MB.
U20
U21U25
U26
U22
U19
U18U23
U24
Locations of the SRAMs on the G486-EVB System Board
EC802G
EC100G