Intel CH-486-33A User Manual

CH-486-33A

User’s

Manual

1st Edition, June 1991

The information contained in this manual is

subject to change without notice

__ _ _

_.___ ____________

IBM

PC/XT/AT/PS-2

are registered trademarks of

International Business Machines Corporation.

AMI

is a trademark of American Megatrends, inc.

486 is a trademark of Intel Corporation.

Other brand and product name or trademarks

and/or registered trademarks of respective companies.

Table Of Contents

1. Introduction

2.

Hardware Description

21

I

System Description 22-Connector and Jumper Settings 23

I

DRAM Bank Configuration

24

-

SRAM Configuration

3

BIOS Setup

31

-

32

I

33

-

34

-

35

I

3-6 37

-

38

-

’

1

I

BIOS Overview Standard CMOS Setup Advanced CMOS Setup Advanced

Chipset

Setup Auto Configuration with BIOS Defaults. Auto Configuration with Power-On Defaults

Write To CMOS and Exit

Do

Not Write To CMOS and Exit

1

htroduction

The

CH-486.33A

is a three-chip solution offering optional

performance for high-end

486.based

AT systems. The

CH-486.33A

is designed for INTEL

80486DX

running 33 MHz

or INTEL

80486SX

running for

20/25MHz

combines three

major functions:

x

The

82C493

System Controller

(sysc)

If

The

82C392

Data Buffer Contrdler (DBC)

tl

The

82C206

Integrated Peripheral Controller (IPC)

l-l. CH-486-33A Mainboard Specification

II

33 MHz INTEL 80486 DX CPU OR

20125

MHz INTEL 80486 SX CPU ISA architecture Copy-Back Direct-Mapped Cache with size of 64KB or 256 KB selectable Up to 32 MB of local high-speed page-mode DRAM

memory space DRAM TYPE support 256K/i

M/4MB

Control of two non-cacheable regions

Shadow

RAM support

Optional Cacheable of shadow video BIOS

Turbo/slow speed selectable for hardware and

software controller

Introduction

1-1

WEITEK 4167 coprocessor socket on board

On board rechargeable battery back-up for CMOS configuration and real-time dock Optimized for

OS/2,

window/386, window 3.0, XENIX, UNIX software operation Baby AT size, with XT/AT mounting

hole

l-2

lntroductlon

2. Hardware Description

2-l

System Description

80486

Microprocessor

The 80486 is a high performance

32.bit

microprocessor with on-chip memory management, floating point and cache memory units. It is binary compatible with members of the 86

architectural family. The 486 CPU contains all the features of the 386 CPU with enhancements to increase performance.

On-chip Floating Point Control Unit

The operation of the 486 microprocessor’s on-chip floating

point control unit is exactly the same as the 387 math

coprocessor. Software written for the 387 math coprocessor will

run on the on-chip floating point unit without any modification. It occupies

I/O

address range of

8OOOOOFOH-SOOOOOFFH

and operates in parallel with the arithmetic and logic unit and provides arithmetic instructions for a variety of numeric data types.

On-chip Cache Memory

The

8KB

on-chip cache is a 4-way set associative write-through code and data cache memory. Individual pages can be designated as cacheable or non-cacheable by software or hardware. The cache can also be enabled and disabled by software or hardware.

Hardware Description

4167 Floating-point Coprocessor

The WEITEK 4167 is a high-performance single-chip floating-point coprocessor for 80486 microprocessor. It is upwardly binary compatible with the WEITEK 3167 coprocessor.

The 4167 coprocessor is a memory-mapped peripheral

that

communicates with the

80486

over the

same address bus tklt

connects the main memory to CPU. The

coprocessor

will

respond to memory addresses

COOOOOOO1:

i

through

CIFFFFFFH. Writing to this ;ddrcss space will

cause the

4

107

to execute this

fractions

coprocessor to drive the

and reading from it will cause the

data

bus.

2-2 Connector and Jumper Settings

This chapter describes the

CH-486.33A main bo;rrd’s

jumpers

and connectors

The system layout are shown on the next

purge.

Hardware Description

.

1

JPll

I

WEITEK

82c4w

4167

1

DRAMBank

30

DRAMBank

I

J23

il

324

d

Wl

SW2

0

JP12

Hardware Description

2-3

SW1

:

Hardware Reset switch Connector

sw2:

Hardware Turbo Switch Connector

Jl

.

Keyboard Connector

JlO:

External Battery Connector

Jll

,

J12: Power Connector

J23:

Keylock and Power LED Connector

J24:

Speaker Connector

JP12:

Turbo LED Connector

2-4

Hardware Description

Jumper

1

Description

1

Setting

JPl

I

Monitor Type Selectable

n : Monochrome

I

JP2

JP4

I

CMOS power

1-2

:

Clear CMOS RAM

2-3 : Backup CMOS RAM

1

JPS

CPU selectable

I

.

[Always

2-3 Short

1

-

1-2

:

487SX

(2-3

:

4860X

13Upen:4BSX

_

I

1

JP6

JP7

CPU selectable

I

[Short : 486

OX,

487SX

J

Open : 486 SX

JP8

1

Cache

$i28 Sdetctabl8

_-.--_-.-.-

Short : 256K

@pen

:

64K

Jp9

JPlO JPll

Cache size selectable

Short :

256K

IOpen

:

64K

[Always Open

Short :

256K

IOpen

:

64K

NOTE : 1.

TItose

enclosed in box

ate

Mainboard

Default

2. This

Mainbmud

mly supput Intel C u

Iater

stepping

cfpracesscx.

Hardware Description

2-5

2-3. DRAM Bank Configuration

The

CH-486.33A

supports 2 banks of

page

mode local

memory, DRAM devices are either

256Kb, 1Mb

or 4Mb large.

Total memory is between

1MB

and 32MB. The following table

illustrates the configuration supported.

Bank 0

1

Bank 1

1

Total

256K

I

1MB

256K

I256K

1

2MB

256K

1M

5MB

i8MB

I

1 4M

I

1

16MB

I

lfvl

I

4M

I20MB

- -1

I

4M

I

lM

I2OMB

I

4M

I

4M

1

32MB

I

*

Use 80ns DRAM

2-6

Hardware Description

2-4

SRAM Configuration

The CH-486-33A has a non-pipeline mode with a 16 bytes line size copy-back Direct-mapped cache, because this cache controller design two-way interleave cache read/write, so only support 64K or 256K secondary cache size.

The following table shows the TAG RAM size, cache RAM size

and cacheable main memory size supported by CH-486-33A.

Cache size (KB)

64K

TAG RAM size

Cache Cacheable main RAM size memory

8Kx 8bit U34

8K x 8bit

16MB

64K x lbit U33

u47 “U49

us1 - us5

256K

32K x 8bit U34 32K x 8bit 32MB 64K x 1 bit

U33

u47 “U49

us1 - us5

Note : . If

you

waut

to

charge

secortd

Ier~el

cache size,

you

mrst

change the SRA M

arid

TAG RAM size

aud Jutqw

Setthg.

Hardware Description

2-7

3.BlOS

SETUP

3-l.

BIOS OVERVIEW

The SETUP program is used to configure the system. These system options are stored in the CMOS. If the CMOS is good, the system is configured with the values stored in the CMOS. If the CMOS is bad, the system is configured with the default values stored in the ROM file.

There are two (2) sets of BIOS values stored in the ROM file

:

tl

The BIOS Setup default values

n

The Power-On default values

The BIOS Setup default values are the default values which are supposed to give optimum performance for the system. They are the best case default values.

The Power-On default values are the default values for the

table values for the system. They are the worst case default

values.

BIOS SETUP

3-l

There are two ways to enter the BIOS setup program

1. Whenever BIOS detects any equipment error or the CMOS contents are not consistent with the equipment.

2. After the power on memory test, the screen will show:

Hit

<DEL>

If you want to run setup

Press the DEL key to get the following screen:

3-2

BIOS

SETUP

-

AMI

BIOS SETUP UTILITIES

--I

(1990)

American Megatrends Inc., All

Rights

Reserved

STANDARD CMOS SETUP ADVANCED CMOS SETUP

ADVANCED

CHIPSET

SETUP

AUTO CONFIGURATION WITH BIOS DEFAULTS

AUTO CONFIGURATION WITH POWER-ON DEFAULTS

WRITE TO CMOS AND EXIT

DO NOT WRITE TO CMOS AND EXIT

.

__ _______

___.__

___ --

Standard CMOS Setup for changing Time, Date, Hard Disk Type, etc.

ESC:Exit

I- 1

l

-- :

Sel

F2/F3:Color

FlO:Save

& Exit

L

~~____

-

____~__

_-

_~___

_.__._ _______ _ ___~_

---___-

Explanation of keys:

FCC:

Exit to setup program

Arrow keys:

Cursor movement

F2/ F3:

Change Color

FlO:

Save Setup values &

&it

to setup program

BIOS SETUP

3-3

The user is given a warning message before he is allowed to

change any of the setup parameters. The warning message is shown as following:

--

______- -- --__ _.._-____--_

-_ .----.- .-.

______________

__

___

.--

__

-

BIOS SETUP PROGRAM

-WARNING

INFORMATION

-_

. _ -_

_.

Improper Use of Setup may Cause Problems !!

If System Hangs, Reboot System and Enter Setup by pressing the <

DEL >

key

Do any of the following After Entering Setup

(i)

Alter options to make system work (ii) Load BIOS Setup Defaults (iii) Load Power-On Defaults

Hit <

ESC>

to stop now, Any other key to Continue

Figure 3 : BIOS Setup Warning Message

Explanation of keys:

ESC

.

Exit to previous screen

Any*

keys : Continue choose setup program

3-4 BIOS SETUP

3-2 STANDARD CMOS SETUP

This option is used to configure the following options:

Date: Month, Date and Year Time: Hour, Minute and Second

Daylight Saving: Disabled or Enabled Hard Disk C: and Hard Disk D: The user can choose

any of the standard hard disk types from 1 to 46 or he

can choose type 47 which is the user defineable type.

The user must enter the hard disk parameters if he

wants to choose the user-definable hard disk type per drive, i.e., type 47 may be different for drive C: and for drive D:.

Floppy drive A: and Floppy drive B: 360KB 5.25,

1.2MB 5.25,

720KB

3.5”, 1.44MB 3.5”,

Not Installed

Primary Display: Monochrome, Color 40 x 25,

VGA/PGA/EGA,

Color 80x25, Not Installed

Keyboard: Installed or Not Installed

BIOS SETUP

3-5

-

Date (mm/ date/ year): Wed, Jun 05 1991

Base memory: 640 KB

lime (hour/ min/

set):

15 : 35 : 50

Ext.

memory: 7168 KB

Daylight saving

:

Disabled

Cyln Head

WPcom

LZone Sect Size

Hard disk C: type

:

Not Installed

Hard disk D: type

:

Not Installed

Floppy drive A

:

1.2 MB, 5.25”

Floppy drive B

:

Not Installed

Primary display

:

VGA/ PGA/ FGA

Key board

:

Installed

BIOS SETUP PROGRAM-STANDARD CMOS

SEI’UP

Month:Jan,Feb,....Dec

Date

:01,02,03....31

Year

:1901,1902....2099

.-

ESC:Exit -

1

--• 1

Select

F2/

F3: Color

PU/

PD:Modify

1

SUN1 MON 1 TUE

1

WED 1

THU

1

SAT

___________. _-_.-.--._- -.---

-__- - _ .-- -

3-6

BIOS SETUP

Note: Daylight Saving

The RTC has a built-in capability to automatically adjust the time on the two daylight savings days of the year

(*).

If this is

desired, set the field to “Enable”.

Otherwise, set field to “Disabled”. Note that in general, nothing will be immediately observable by setting the field to either state.

.

Eg,

Daylight Savings..

......

Enable

Daylight Savings..

.....

Disable

*

On the

lcrrt

Sun&y

@April”

the time increments

frm 1:59:59

am

to 3:00:00 am On

thelast

Sunday in October, when the time

first reaches

1:59:59 am,

it is

rdled-barck

to 1:OO:OO

am

BIOS

SETUP

3-7

3-3.

ADVANCE CMOS SETUP

The ADVANCED CMOS SETUP option is used to set the various system options for the user. The user can get various options, some of which are listed below:

n

Weitek Processor

Ll

External Cache Memory

CI

Internal Cache Memory

II

Adaptor ROM Shadow

II

Shadow RAM

3-8

BIOS SETUP

.

___ _----

BIOS SETUP PROGRAM - ADVANCED CMOS SETUP

(C)

1990

___._____~~-

_

__--_-.___J

____~-_---

II-------11

Weitek Processor

External Cache Memory Internal Cache Memory Adaptor

ROM

Shadow C800,16K Adaptor ROM Shadow CCOO, 16K Adaptor ROM Shadow DOOO,

16K

Adaptor ROM Shadow D400,16K Adaptor ROM Shadow D800,16K Adaptor ROM Shadow

DCOQ 16K

Adaptor ROM Shadow EOOO, 16K Adaplor ROM Shadow

E400,16K

Adaptor

ROM

Shadow E800,16K Adaptor ROM Shadow ECOO, 16K Shadow RAM Option

: Absent

:

Enabled

:

Enabled

:

Disabled

:

Disabled

:

Disabled

:

Disabled

:

Disabled

:

Disabled

:

Disabled

:

Disabled

:

Disabled

:

Disabled

:

Disabled

L-

__________~

-LI

______-

--------~

I/

ESCExit *---I -

l

1 : Sel

(Ctrl)Pu/Pd:Modify

F 1 :Hslp

F27F3:Color

F5:Old

Values

FGBIOS Setup Defaults

F7:Power-On

Defaults

II

1 L._____._ - - _.___ __-..--

---

IJ

__-__-

_-_----

_I----.

Explanation of keys:

ESC : Exit to previous screen Arrow keys: Cursor movement

PageUp/PageDown/Ctrl

PageUp/Ctrl

PageDown:

Modify the

value of the option by

l/-1/10/-10.

If the option has less than

10 available answers, then c Ctrl PageUP > is the same as

<

PageUP > and <

CtrlPageDown >

isthesameas <

PageDown >

Fl : Opiton for Help

F2/F3

:

Change Color

FS

:

Get the old values. These are the values with the user starting from the current session. If the CMOS was good, then the old values are the CMOS values, hense they are the BIOS Setup default values.

F6

:

This will load all the Options in the Advanced CMOS

Setup/Advanced

Chipset

Setup with the BIOS Setup defaults F7 : This will load all the Options in the Advanced CMOS Setup/Advanced

Chipset

Setup with the Power-On defaults

.

WEITEK Processor

WEITEK coprocessor insert in socket

,preset

is set

When not inserted in socket, absent is set.

BIOS SETUP

External Cache Memory

This function can be setup enable/disable External Cache (second leave cache)

64/256KB.

Internal Cache Memory

This function can be setup enable/disable CPU Internal cache 8

KB

.

Adaptor RAM Shadow

Adaptor Shadow RAM address range from

C8000H

to

EFFFFH, each Block size at 16KB for enable or disable

Shadow RAM

There are four function that can be selected:

Video: Video shadow

(COOOO-C7FFFH)

Main

:

Main BIOS shadow

(FOOOO”FFFFFH)

both

:

Video and Main BIOS Shadow

Disable

:

Disable shadow

BIOS SETUP

3-11

3-4 ADVANCED

CHIPSET

SETUP

The ADVANCED CHIPSET SETUP option is used to change

the register values for the

chipset

registers. The

chipset

registers control most of the system options in the computer. Explanation keys: ESC : Exit to previous screen

Arrow keys

:

Cursor movement

PageUp/PageDown/Ctrl PageUp/Ctrl PageDown

:

Modify

the value of the option by

l/-1/10/-10.

If the option has less

than 10 available answers, then <

Ctrl PageUp >

is same

as

< PageUp > and < CtrlPageDown > is same as < PageDown

>

Fl

:

Help for the option

F2/F3

:

Change Color

F5

:

Get the old values. These are the values with the user starting from the current session. If the CMOS was good, then the old values are the CMOS values, hence they are the BIOS Setup default values.

F6 : This will load all the Options in the Advanced CMOS Setup/Advanced

Chipset

Setup with the BIOS Setup

defauhs

F7

:

This will load all the Options in the Advanced CMOS

Setup/Advanced

Chipset

Setup with the Power-On defaults

3-12 BIOS SETUP

_ __-_--.-~-

__._ _-_ - -~-----

1

__-.

__.

_--_

-

_-___-----__~-

BIOS Setup Program -

AMI

BIOS Utilities

(C)

1990

American Megatrends Inc., All Rights

Reserved

- -.-----------_---

--

Non-Cacheable Block- 1 Size

:

Disabled

Non-Cacheable Block-l

Base

:OKB

Non-Cacheable Block-2 Size

:

Disabled

Non-Cacheable Block-2 Base

:OKB

Cacheable

RAM

Address Range

;8MB

Video BIOS Area

Cacheable

:

Y8S

ESC:Exit

f

_._.

1 .-:

Sel

Ctrl) Pu/Pd: Modify

Fl

:

Help F2/F3:

Color

F5:Old

Values

F6: BIOS Setup Defaults

R:

Power-On Defaults

II

BIOS SETUP

3-l 3

Non-Cacheable Block Size

This setup for set Non-Cacheable block size of

64/128/256/5 12K/Disable

Non-Cacheable Block Base

This setup for set Non-Cacheable Block Starting address for example, if a

512KB

non-cacheable block is selected its starting

address is a multiple of

512KB

Cacheable RAM Address Range

This Cacheable DRAM size, you can select from range

(l-64MB)

Video BIOS Area Cacheable

Enable or Disable Video BIOS Cacheable Please check your VGA card, If OAK VGA card (slow speed), this function must disable

3-l 4

BIOS SETUP

3-5.

AUTO CONFIGURATION WITH BIOS

DEFAULTS

When you enter AUTO CONFIGURATION WITH BIOS DEFAULTS, the screen will be as follows:

BIOS SETUP PROGRAM -

AMI

BIOS SETUP UTILITIES

(C)

1990

American

Megatrends

STANDARD CMOS SETUP ADVANCED CMOS SETUP

AUTO CONFIGURATION

WlTH

BIOS DEFAULTS

AUTO CONFIGURATION

WlTH

POWER-ON DEFAULTS

1

Load BIOS Setup Default Values from ROM Table (Y/N)

.?

N

1

Load BIOS Setup

Defaullt

Values for Advanced CMOS and Advanced

CHIPSET

Setup

ESC:Exit

1 - 1

-

:Sel FZIF3:Color FlO:Save

& Exit

r

Press

“Y”

or ’ N” to change ADVANCED CMOS SETUP and

ADVANCED

CHIPSET

SETUP with BIOS default values.

I

Note:

Tote

BIOS default values, setup

chipset

register for

mainboard

mnning high pegonnance.

I

BIOS SETUP

---

~

3-l 5

3-6 AUTO CONFIGURATION WITH POWER-ON

DEFAULTS.

When you enter

AUTO)

CONFIGURATION WITH

POWER-ON DEFAULTS, the screen will be as follows:

BIOS SETUP PROGRAM

- AM

BIOS SETUP UTILITIES

STANDARD CMOS SETUP

ADVANCED CMOS SETUP

AUTO CONFIGURATION WITH BIOS DEFAULTS

AUTO CONFIGURATION WITH POWER-ON DEFAULTS

Load Power-On Default Values from ROM Table (Y/N) ? N

Load Power-On Default Values for Advanced CMOS and Advanced

CHIPSET

Setup

-

ESCExit

I__-.

I._ :

Sel

FYF3:

Color

F1O:Save

& Exit

Press

“Y”

or

“NW

to change ADVANCED CMOS SETUP and

ADVANCED CHIPSET SETUP with Power-on default values.

I

Note :

77le Power-011 default

values, setup

chipset

register for

mairtboard nrrtrtirtg lowperfomrartce.’

I

3-16

BIOS SETUP

3-9. WRITE TO CMOS AND EXIT

The options set in the Standard Setup, Advanced Setup, Advanced Chip-set Setup and the New Password (if it has been changed) are stored in the CMOS. The CMOS checksum is calculated and written into the CMOS. After that, control is passed back to the BIOS.

3-10.

DO NOT WRITE TO CMOS AND EXIT

Control is passed back to the BIOS without writing to the CMOS.

BIOS SETUP

3-17