Page 1
EP-PT22
Motherboard of
Pentium with MMX
User’s Manual
Order Number 4101003
November 1997
Page 2
EC-Conformity Declaration
(EC conformity marking)
FOR THE FOLLOWING EQUIPMENT:
Product Name : MOTHERBOARD
Model : EP-PT22
Manufacturer Address: 6FL., No. 19, Wu Chuan 6 Rd.,
Wu-Ku Industrial Park, Taipei, Taiwan,
R.O.C.
IS HEREWITH CONFIRMED TO COMPLY WITH THE EQUIPMENTS
SET UP IN THE COUNCIL DIRECTIVE ON THE APPROXIMATION
OF THE LAW OF MEMER STATES RELATING TO
ELECTROMAGNETIC COMPATIBILITY (89/336/EEC) AND LOW
VOLTAGE DIRECTIVE 78/28/EEC. FOR THE EVALUATION
REGARDING THE ELECTROMAGNETIC COMPATIBILITY AND
SAFETY, THE FOLLOWING STANDARDS WERE APPLIED:
EN50081-1 (1992): GENERIC EMISSION STANDARDS
EN550022 (1994): EMISSION
EN60555-2 (1987): HARMONICS
EN60555-3 (1987): VOLTAGE FLUCTUATIONS
EN50082-1 (1992): GENERIC IMMUNITY STANDARD
IEC 801-2 (1984): ELECTROSTATIC DISCHARGE IMMUNITY
IEC 801-3 (1984): RADIATED IMMUNITY
IEC 801-4 (1988): ELECTRICAL FAST TRANSIENT
The manufacturer also declares the conformity of the above mentioned
product, with the actual required safety standards in accordance with LVD
73/23 EEC.
Manufacturer/Importer
Date:
Signature:___________________ Signature: .
Name : JEFF CHANG . Name : KUNNAU CHEN .
(Project Leader) (President)
Page 3
EP-PT22
Motherboard
for
Compatible PC
User Manual Rev 1.0
Related Motherboard: EP-PT22 P.C.B. Rev 1.2 and up
Date: Nov. 1997
EP-PT22 User’s Manual
i
Page 4
TABLE OF CONTENTS
Chapter 1.............................................................................................1
1-1 About this Manual..............................................................................1
1-2 Item Checklist....................................................................................2
1-3 Specifications.....................................................................................3
Chapter 2.............................................................................................7
2-1 Motherboard Layout..........................................................................6
2-3 System Memories...............................................................................8
2-4 Central Processing Unit (CPU)........................................................10
2-5 Expansion Cards..............................................................................10
2-6 External Connectors.........................................................................11
2-7 Hardware Jumper/Switch Setup.......................................................28
APPENDIX........................................................................................30
.............................................................................................................30
EP-PT22 User’s Manual
ii
Page 5
FCC & DOC COMPLIANCE
Federal Communications Commission Statement
This device complies with FCC Rules Part 15. Operation is subject to the
following two conditions:
This device may not cause harmful interference, and
This device must accept any interference received, including interference
that may cause undesired operation.
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 interference
in a residential installation. This equipment generates, uses and can radiate
radio frequency energy and, if not installed and used in accordance with
manufacturer’s instructions, 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:
Re-orient or relocate the receiving antenna.
Increase the separation between the equipment and receiver.
Connect the equipment to 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.
Warning: The use of shielded cables for connection of the monitor to the
graphics card is required to assure compliance with FCC regulations.
Changes or modifications to this unit not expressly approved by the party
responsible for compliance could void the user’s authority to operate this
equipment.
EP-PT22 User’s Manual
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Page 6
Federal Communications Commission (Continued...)
Canadian Department of Communications Statement
This digital apparatus does not exceed the Class B limits for radio noise
emissions from digital apparatus set out the Radio Interference Regulations
for the Canadian Department of Communications.
EP-PT22 User’s Manual
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Page 7
Chapter 1. INTRODUCTION
1-1 About this Manual
This manual is arranged to help you set up and run this Motherboard of
Pentium with MMX as soon as possible.
The information is presented in the following two chapters:
Chapter 1 Introduction:
Presents what you should receive with your
motherboard, the features and specifications of the
product. This chapter is enclosed with a diagram
showing the layout out of the motherboard.
Chapter 2 Installation:
Motherboard Installation includes detailed
information on how to install and configure the
motherboard.
EP-PT22 User’s Manual
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Chapter 1. INTRODUCTION
1-2 Item Checklist
This product comes with the following components:
Motherboard x 1
40-pin IDE Connector Flat Cable x 1
34-pin Floppy Disk Drive Flat Cable x 1
User’s Manual x 1
Bus Master IDE Drivers
Diskette x 1 (Option)
Rear Panel Shielding (Option)
IrDA Module x 1 (Option)
50-Pin SCSI Connection Flat Cable x 1 (Option)
Sound Driver Diskette x 1 (Option)
SCSI Driver Diskette x 1 (Option )
50 Pin SCSI Connection Cable Ribbon for Bracket (Option)
LDCM Diskette x 1 (Option)
Option : Components will be included upon customer ordering
instructions per Proforma Invoice & additional external procurement cost
will be included.
EP-PT22 User’s Manual
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Chapter 1. INTRODUCTION
1-3 Specifications
Processor: ZIF Socket 7 support Intel Pentium with MMX
up to 233MHz, Intel P54C + PPMT (P55C) +
Cyrix M1/M2 + AMD K5/K6 Series CPU’s, CPU
Clock Select support for 50, 55, 60, 66, 75 and
83MHz CPU Bus speed configuration.
Chipset: Intel 82439TX System Controller
Intel 82371AB PCI/ISA IDE Accelerator
BIOS: Award/AMI BIOS with PnP, Onboard SCSI
Support (Optional), CD-ROM, ATAPI, LS-120,
and any IDE Device Bootable, Virus Protection.
Cache Onboard: 512KB Pipeline Burst SRAM Cache
System Memory: 4 x 72-pin SIMM/2 x 168-pin DIMM Slots support
up to 256MB. Support Mixed Memory
Technologies: Extended Data Out (EDO), Fast
Page (FP) DRAM, Synchronous DRAM (SDRAM)
Multi-I/O Onboard: 1 x FDD Port support up to 2.88MB
1 x Parallel Port (LPT) support ECP/EPP
2 x High Speed Serial (16C550 UART) Ports
2 x Universal Serial Bus (USB) Ports
1 x PS/2 Keyboard Port
1 x PS/2 Mouse Port
2 x IrDA Infrared Interfaces
2 x SCSI Port Support SCSI I, II, Specification
EP-PT22 User’s Manual
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Chapter 1. INTRODUCTION
PCI Bus Master IDE: PCI Enhanced IDE Interface with 4 IDE Devices
Support HDD Auto-Detect
Support up to PIO Mode 4, DMA Mode 2
Support Ultra DMA/33 mode
Fully compatible with PCI Local Bus
Specifications V2.1
ATX Stack
Connector: 2 x USB Ports, 1 x Game Port, 1 x PS/2
Keyboard Port, 1 x PS/2 Mouse Port, 1 x Parallel
Port, 2 x Com Port, 1 x Audio Line in Port 1 x
Audio Line Out Port, 1 x Audio Mic In Port
Expansion Slots: 3 x 16-bit ISA Slots with 100% ISA Compatible
Functions
4 x 32-bit PCI Slots supporting PCI Master
Conform with PCI Specifications Version 2.1
Options: Infrared (IrDA) Wireless Interface Kit (Front &
Rear)
Universal Serial Bus (USB) Connector Kit
LM78 Hardware Monitor, LM75 thermal detect
Circuit Design
EP-PT22 User’s Manual
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Chapter 1. INTRODUCTION
Extended Features: Advanced Configuration and Power Interface
(ACPI) ready
Surround 3D Audio with Enhanced Wave Table
Support (Optional)
SCSI Support (Optional)
Support Power Monitor with Alarm
Support Modem Ring Wake Up
Compliant with PC97
Support Win95 Soft Power Off (For ATX Power
only)
Support SM-Bus
Dimension: 305mm x 210mm
Form Factor: ATX Form Factor
EP-PT22 User’s Manual
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Chapter 2 INSTALLATION
2-1 Motherboard Layout
The motherboard is designed with the Intel 82430TX, PCI chipset which is
developed by Intel Corporation to fully support the Pentium Processor
PCI/ISA system. The Intel 82430TX PCI chipset provides increased
integration and improved performance designs. The chipset provides an
integrated IDE controller with two high performance IDE interfaces for up
to four IDE devices (hard devices, CD-ROM device, etc). The Super I/O
controller provides the standard PC I/O function: floppy interface, two
16Byte FIFO serial ports and EPP/ECP capable parallel port.
Care must be taken when inserting memory modules, inserting CPU or
even plugging PCI card into associated slots to avoid damaging any circuits
or sockets on board. A cooling fan is strongly recommended when
installing P54C/P54CTB/P55C/ K5/K6/6x86/M2 due to possible overheat.
The motherboard supports minimum of 8 MB of system memory and a
maximum of 256MB.
The onboard L2 Cache is 512KB SRAM to increase system performance.
The motherboard supports standard Fast Page (FP), EDO (Extended Data
Out), or SDRAM (Synchronous DRAM). The motherboard provides four
72-pin SIMM. The socket supports 1Mx32 (32MB) single-sided or doublesided memory modules. The memory timing requires 70ns Fast Page
devices or 60ns EDO RAM. Memory parity generation and checking is not
supported. (DRAM Modules may be parity (x36) or non-parity (x32).
The board also supports onboard two PCI IDE connectors, and detects the
IDE hard disk type by the BIOS utility which is automatic. The system also
supports Award Plug & Play BIOS for the ISA and PCI cards.
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Chapter 2 INSTALLATION
2-2 Motherboard Layout
EP-PT22 User’s Manual
SpeakerOut
Volume
Control
Front Panel
Connector
Game Port
PS/2 Keyboard
and PS/2
Mouse
Dual USB
Port
Com 2
LPT1
Com 1
Mic-In
Line-Out
Line-In
Multi I/O
Speaker-In
IrDA Rear
Sound Chip
4 x PCI
Speaker In
Flash ROM
Wave Table
(Optional)
LM78
3 x ISA
4 x SIMM
2 x DIMM
AT/ATX Power Suppy
DIMM Voltage Select
VCORE
Set SW
V2D 4
ZIF Socket 7
LM 75
VIO
Frequency Ratio
Floppy Port
512KB PB
SARM
IrDA Front
HCLK
Host Clock
Switch
SCSI
Connectors
(Optional)
Primary IDE
Secondary IDE
Fan Connector
Ext. Battery
Clear CMOS
430 TX
Chipset
SCSI Chipset
(Optional)
7
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Chapter 2 INSTALLATION
2-3 System Memories
This motherboard supports four 72-pin SIMM (Single Inline Memory
Modules) of 4MB, 8MB, 16MB, 32MB, 64MB to form a memory size
between 8MB to 256MB. The motherboard also supports two 168-pin
DIMM. The DRAM can be either 60ns or 70ns Fast Page Mode (FPM,
Asymmetric or Symmetric), Extended Data Output (EDO). SIMMs must
be installed in pairs so that each bank contains two of the same size
memory modules.
Install memory in any or all of the banks at any combination as the
following page:
NOTE: Each bank must have the same size and type (FPM, EDO) of
memory installed in pairs. Memory setup is required “Auto Configuration”
in Chipset Features Setup of the BIOS Software section.
EP-PT22 User’s Manual
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Chapter 2 INSTALLATION
2-4 System Memories (Continued…)
Item Bank Memory Module
1 DIMM 1 8~128MB
2 DIMM 1, 2 8~128MB
3 DIMM 1
SIMM 1, 2
8~128MB
4 ~ 64MB
4 DIMM 2
SIMM 3, 4
8~128MB
4 ~ 64MB
5 SIMM 1, 2 4 ~ 64MB
6 SIMM 3, 4 4 ~ 64MB
7 SIMM 1, 2, 3, 4 4 ~ 64MB
EP-PT22 User’s Manual
SIMM 4
SIMM 3
SIMM 2
SIMM 1
DIMM 1
DIMM 2
9
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Chapter 2 INSTALLATION
2-5 Central Processing Unit (CPU)
The motherboard provides a 321-pin ZIF Socket 7. The CPU should
have a fan attached to it to prevent overheating. If your CPU did not
come with a fan, then purchase a fan before you turn on your system.
Apply thermal jelly to the CPU top and then install the fan onto the
CPU.
NOTE: Without a fan, the CPU will overheat and cause damage to both the
CPU and the motherboard. To install a CPU, locate the ZIF socket and
open it by first pulling the lever sideways away from the socket’s “Lock”
then upwards to a 90-degree right angle. Insert the CPU with the correct
orientation. Look to see that the pins are denser on one half compared to
the other half. The picture is for reference only, you should have a CPU fan
that will cover the face of the CPU. With the added weight of the CPU fan,
no force is required to insert the CPU. Once completely inserted, hold
down the fan and close the socket’s lever.
NOTE: You must set the CPU External Clock (BUS) Frequency Selection”
and “CPU to BUS Frequency Ratio” depending on the CPU that you
install.
EP-PT22 User’s Manual
ZIF Socket 7
ZIF Socket 7
10
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Chapter 2 INSTALLATION
2-6 External Connectors
1. PS/2 Keyboard Connector and USB Port (J26, 6-pin Female
and J25, 4-pin Female)
This connection is for a standard keyboard using PS/2 plug (mini
DIN). This connector will not allow standard AT size (large DIN)
keyboard plugs. You may use a DIN to mini DIN adapter on
standard AT keyboard.
2. PS/2 Mouse Connector (J26, 6-pin Female)
The system will direct IRQ12 to the PS/2 mouse if one is
detected. If not detected, expansion cards can use IRQ12.
EP-PT22 User’s Manual
J26: PS/2 Keyboard Connector
J25: USB Port
(Support Standard
USB Specification)
J26: PS/2 Mouse Connector
11
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Chapter 2 INSTALLATION
3. Parallel Printer Port (J23, 25-pin Female)
You can enable the parallel port (LPT1) and choose the IRQ
through BIOS Setup on “Onboard Parallel Port”.
4. Serial Ports (J24: COM2, J21: COM1, 9-pin Male).
The two serial (COM1 & COM2) ports can be used for pointing
devices or other serial devices. See “Onboard Serial Port” in
Chipset Features Setup of the BIOS Software.
EP-PT22 User’s Manual
J23: Parallel Port
1
J24: Com2
J21: Com1
12
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Chapter 2 INSTALLATION
5. ATX Power Connector (J27, 20-pin block)
This connector connects to an ATX power supply. The plug from
the power supply will only insert in one orientation because of
the different hole sizes. Find the proper orientation and pushed
down firmly making sure that it is locked in place.
NOTE: To prevent electrical spikes, make sure that the power supply is not
connected to an outlet when making or removing connections. Power
supplies contain power reserves which can damage electrical components.
6. Floppy Drive Connector (J18, 34-pin block)
This connector supports the provided floppy disk drive ribbon
cable. After connecting the single end to the board, connect the
plugs on the other end to one or two floppy drives.
EP-PT22 User’s Manual
J28 AT Power Connector
J27: ATX Power Connector
J18: FDD Connector
13
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Chapter 2 INSTALLATION
7. Primary/Secondary IDE connectors (J4 & J5: Two 40-
pin Blocks)
These connectors support the provided IDE hard disk ribbon
cable. After connecting the single end to the board, connect the
two plugs at the other end to your hard disk(s). If you install two
hard disks, you must configure the second drive to Slave mode by
setting its jumper accordingly. Please refer to the documentation
of your hard disk for the jumper settings. BIOS now supports
SCSI device or IDE CD-ROM boot-up (see “Boot Sequence” in
the BIOS Features Setup of the BIOS Software).
EP-PT22 User’s Manual
J4: Primary
HDD
J5: Secondary
HDD
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Chapter 2 INSTALLATION
8. SCSI Connectors (Optional J16, CON1)
This 50 Pin connector and flat cable allows connection of several
SCSI devises. The SCSI devices can be chained together and the
last device must be Termination Enabled. All other devices in the
chain must be Termination Disabled. The SCSI Driver Diskette
provided with this option contains the configuration utility.
EP-PT22 User’s Manual
J-16: 50 Pin
Con1
15
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Chapter 2 INSTALLATION
9. a. IDE Activity LED (J2, Pin 2-4)
This connector connects to the IDE (hard disk) activity
indicator light on the system cabinet.
EP-PT22 User’s Manual
1
J2, Pin 2-4: HDD Activity LED
16
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Chapter 2 INSTALLATION
b. System Power LED (J2, Pin 9-11, Pin 9-13)
This 2-pin connector lights the system power LED when the
motherboard has power.
NOTE: For case housing with 2-pin connector, connect direct pin-to-pin to
J2, 9-11. For case housing with 3-pin connector, connect direct pin-to-pin
to J2, 9-13 of motherboard.
EP-PT22 User’s Manual
J2, Pin 9-11
+ - 1
Pin 9-11, for 2-pin connector
+ + - 1
J2, Pin 9-13
Pin 9-13, for 3-pin connector
17
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Chapter 2 INSTALLATION
c. ATX Power Switch (PWR SW, J2, Pin 10-12)
The system power is controlled by a push button switch,
connected to this lead. Pushing the button once will turn on
the system and pushing another time will turn off the system.
The system power LED shows that status of the system’s
power. This connection does not have a function when a
standard power supply is used.
NOTE: If the power to the ATX power supply is interrupt while the
motherboard is on, standby power will remember that the motherboard
should be on and boot the computer when power is reapplied to the ATX
power supply.
EP-PT22 User’s Manual
J2 Pin10-12:ATX Power Switch
PS-SW
1
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Chapter 2 INSTALLATION
d. Reset Switch Lead (J2, Pin 18-20, RESET)
This 2-pin connector connects to the case-mounted reset
switch for rebooting your computer without having to turn
off your power switch. This is a preferred method of
rebooting in order to prolong the life of the system’s power
supply.
e. Turbo LED (J2, Pin 6-8)
The motherboard's turbo mode is always on, so an LED
attached to this connector will always be lit while system
power is on. You may wish to connect the Power LED of
your system case to this connector.
EP-PT22 User’s Manual
1
J2, Pin18-20: Reset Switch Lead
1
J2, Pin 6-8 : Turbo LED
+ -
19
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Chapter 2 INSTALLATION
f. Keyboard Lock Switch Lead (J2, Pin 15-19)
This 3-pin connector connects to the case-mounted keyboard lock
switch for locking the keyboard and also to connect the system power
LED. The system power LED lights when the system is powered on.
g. Speaker Connector (J2, Pin 1-7 : SPEAKER)
This 4-pin connector connects to the case-mounted speaker.
EP-PT22 User’s Manual
1
J2, Pin15-19: KEYLOCK
1
J2, Pin 1-7 Speaker
20
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Chapter 2 INSTALLATION
10. External Battery Connector (J7)
When using the external battery connector, be very careful of the
polarity . Also, be sure to use only batteries rate at 4.5 ~ 6.0 V.
11. Clear CMOS Connector (J8)
Temporarily placing a jumper across pins 1-2 of this pin block will
erase all user-defined BIOS setting. For regular use, the jumper can be
stored on pins 2-3, which is marked as NORMAL. Be certain that
system power is OFF before using this feature!
EP-PT22 User’s Manual
1
Normal
Clear CMOS Connector
Ext. Battery Connector
- +
Clear
21
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Chapter 2 INSTALLATION
12. CD-IN connector (J11)
This connector supports CD-ROM Audio signal input from
CD-ROM driver.
13. Flash ROM Vpp Select Jumper (J6)
This jumper selects Vpp for the Flash ROM. By default, it's set to +5V
(pins 1-2). Moving the jumper cap to pin 2-3 sets the Vpp to +12V. If
you change the ROM chips, you should check the specifications to be
sure you set the right value.
EP-PT22 User’s Manual
R-IN
-
L-IN
CD-IN Connector
+5v
22
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Chapter 2 INSTALLATION
14. SCSI Device Activity LED (LED1)
When SCSI device is accessing the LED be light.
15. PC Speaker connector (J10)
This connector can output the audio signal to PC Speaker at inner case
of PC.
EP-PT22 User’s Manual
+ -
LED1: SCSI Access LED
- +
J10 : PC Speaker Connector
23
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Chapter 2 INSTALLATION
16. Setting CPU Type (J3)
Pin block J20 selects the CPU type. Since this also affects the power
supply to the CPU, it is important to be very careful with this setting, to
avoid damage to the CPU.
For P55C, K6, and M2 type CPUs, set jumper caps on the two pin-pairs
which are closest to the center of the motherboard.
EP-PT22 User’s Manual
1
Setting CPU Type (J3)
1
P55C, K6, M2
P54C, K5, M1
24
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Chapter 2 INSTALLATION
17. CPU Vcore Jumper Setting (SW2 & VID4)
Pin block JP1 is selects the CPU core voltage. Since this affects the
power supply to the CPU, it is important to be very careful when setting
this jumper, to avoid damaging the CPU. The various settings are
shown in the table in the next section.
SW2
EP-PT22 User’s Manual
VID4
SW2 & VID4
25
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Chapter 2 INSTALLATION
18. CPU Cooling Fan Connector (J29, J30)
These connector support a CPU cooling fan of 500 mAmp.
(6Watt, +12V) or less. Orient the fan so that the heat sink fins
allow airflow to go across the onboard heat sink(s) instead of the
expansion slots. Depending on the fan manufacturer, the wiring
and plug may be different. The red wire should be positive, while
the black should be ground. Connect the fan’s plug to the board
taking into consideration the polarity of the connector.
EP-PT22 User’s Manual
+
+
Fan1
-
DET1
J29
-
J30
DET2
Fan2
26
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Chapter 2 INSTALLATION
NOTE: The CPU and/or motherboard will overheat if there is no airflow
across the CPU and onboard heat sinks. Damage may occur to the
motherboard and/or the CPU fan if these pins are incorrectly used. These
are not jumpers, do not place jumper caps over these pins.
19. IrDA Infrared Connector (J15, Front IrDA; J17, Rear IrDA)
These connectors support the optional wireless transmitting and
receiving infrared module. This module mounts to a small
opening on system cases that support this feature. You must also
configure USRT 2 Use Infrared in Chipset Features Setup to
select whether UART2 is directed for use with COM2 or IrDA.
When IrDA is selected in BIOS, COM2 will be disabled. Use the
five pins as shown on the Back View and connect a ribbon cable
from the module to the motherboard to the pin definitions.
EP-PT22 User’s Manual
1
1
J17: IrDA Rear
J15: IrDA Front
Pin 6 : NC
5 : IRTX
4 : GND
3 : IRRXL
2 : IRRXH
1 : +5V
27
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Chapter 2 INSTALLATION
2-7 Hardware Jumper/Switch Setup
1. External HCLK Frequency (SW1, refer APPENDIX)
2. Frequency Ratio (JB2, Refer APPENDIX))
EP-PT22 User’s Manual
SW1
1 2 3 4
ON
Note: Default Setup is OFF
JB2: Frequency Ratio
1
2
3
BF2 BF1 BF0
(Default setting)
28
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Chapter 2 INSTALLATION
3. CPU VCORE Setup (refer Appendix)
Note:
Intel P54C: CORE & I/O Voltage 3.3V
Intel P55C: CORE Voltage 2.8V (+/- 3.57%)I/O Voltage
3.3V (-5%, +9.09%)
Cyrix 6x86-PRXX+: CORE & I/O Voltage (016): 3V, (028): 3.52V
(3.15V-3.70V)
Cyrix 6x86L-PRXX+: CORE Voltage 2.8V & I/O Voltage 3.3V
AMD K5-PRXX: CORE & I/O Voltage 3.52V (3.45V-3.6V)
AMD K6-PR166/200: CORE Voltage 2.9V (+/- 0.145V) I/O Voltage
3.3V (+0.3V -0.165V)
EP-PT22 User’s Manual
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APPENDIX
APPENDIX
FREQUENCY RATIO
AMD CYRIX INTEL BF0 BF1 BF2
1.75X 2/M1, 2.5/M2 2.5 2-3 2-3 1-2
2.0X 3 3 1-2 2-3 1-2
1.5X 2 2 2-3 1-2 1-2
1.5X 3/M1, 3.5/M2 1.5/P54C,3.5/P55C 1-2 1-2 1-2
AMD-K6/PR 166 2-3 2-3 1-2
AMD-K6/PR 200 1-2 2-3 1-2
AMD-K6/PR 233 1-2 1-2 1-2
SW1
321
HCLK
OFFONON
55.0M
OFFONOFF
75.0M
OFF
OFF
ON
60.0M
OFF
OFF
OFF
66.6MONONON83.3MONON
OFF
33.3M
ON
OFF
ON
50.0M
ON
OFF
OFF
68.5M
EP-PT22 User’s Manual
Voltage/
Frequency
Settings
For
EP-PT22
CPUVCORE (SW2)
& Vid4
Frequency Ratio (JB2)
External Clock
Frequency (SW1)
30
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EP-PT22
User’s Manual
100
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