Nexcom NEX 6620A User manual

NEX 6620A User's Guide Rev. B0 0301
NEXCOM
NEX 6620A
ATX Industry Server Board
User′
′′′s Guide

NEX 6620A User's Guide Rev. B0 0301
NEXCOM
@Copyright 2000
All Rights Reserved
Manual edition 1, September 2000
The information in this document is subject to change without prior notice in order to improve reliability,
design and function and does not represent commitment on the part of the manufacturer.
In no event will the manufacturer be liable for direct, indirect, special, incidental, or consequential damages
arising out of the use or the possibility of such damages.
This document contains proprietary information protected by copyright. All rights are reserved. No part of
this manual may be reproduced by any mechanical, electronic, or other means in any form without prior
written permission of the manufacturer.
Trademarks
NEX 6620A is registered trademarks of NEXCOM Co., Ltd., IBM PC is a registered trademark of
International Business Machines Corporation. Intel and Pentium are registered trademarks of Intel
Corporation. Award is a registered trademark of Award Software, Inc. Other product names mentioned
herein are used for identification purposes only and may be trademarks and/or registered trademarks of their
respective companies.

NEX 6620A User's Guide Rev. B0 0301
NEXCOM
How to use this guide
This manual is written to help you use NEX 6620A. It describes how to arrange various settings on the
Pentium CPU board to meet your requirements. It is briefed as follows:
Chapter 1, “Introduction” gives an overview of the product‘s specifications. It also tells you what are
included in the product package.
Chapter 2, “Switches and Connectors” describes the definitions and positions of Jumpers and Connectors
that you may easily configure and set up per your requirement.
Chapter 3, “Capability Expanding” describes how to change or expand the CPU Board by changing the
system memory, cache memory, and CPU to get more power out from the CPU board.
Chapter 4, “Award BIOS Setup” describes how to use the advanced PCI/Green BIOS to control almost
every feature of the NEX 6620A, including the watchdog timer.
.

NEX 6620A User's Guide Rev. B0 0301
Introduction 1-1
Chapter 1 Introduction
NEXCOM has developed a brand new product in its history, the Dual Pentium III FC-PGA, VIA Apollo Pro
266 Chipset based all in one board with the ATX form factor. The NEX 6620A is the first model to be
available.
NEXCOM has developed a brand new product in its history, the Dual Pentium III FC-PGA; VIA Apollo Pro
266 based all-in-one main board with the ATX form factor. A new product family called the NEX series is
created. The NEX 6620A, name of this new product, is the first model to be available.
The major features of the NEX 6620A are as follows:
1. Dual Pentium III FC-PGA architecture with 133 MHZ FSB up to 1 G+Hz CPU clock.
2. Support DDR SDRAM with 4 DIMMs, memory size up to 4 GB.
3. On board built with VGA×1, intel 82559 Ethernet controller×2, PCI based Adaptec AIC 7899 dual channel
Ultra/ 160m.
4. AGP slot×1 for 4×AGP, and 32 bit/ 33 MHz PCI slot×5.
With all above features equipped on board, The NEX 6620A is one of the top performance DP server boards
in the world. So far, it’s still the smallest main board with so many features integrated on the standard ATX
form factor. Without any add on cards, the NEX 6620A could out perform most of the server boards because
there are 2x 100 Base TX Ethernet ports and 2x Ultra/ 160m SCSI channels on board. NEX6620A is
particularly suitable for the ISP server applications. A 2U chassis could easily accommodate the NEX 6620A.
For larger server chassis, like the big tower, 5U, 6U, or even 8U rack mounted chassis, the NEX 6620A
could also be applied in these cases that are ATX compatible. The reason to create the ATX server line is
based on the fact that most producers use ATX form factors. With rigidly complying with ATX specifications,
the NEX 6620A could be applied in any case requiring the top server performance, as long as it’s ATX
compatible.
The NEX 6620A could also be positioned as the top performing workstation. With the on board AGP, the 4X
AGP slot reserved for any next generation 3D VGA/ Video accelerator cards, the NEX 6620A could out
perform any other DP architectures. Again, the standard ATX form factor is the greatest advantage of the
NEX 6620A for any workstation chassis, and it will help a lot for the NEX 6620A to be widely accepted by the
power users in the compute-intensive workstation applications or the I/O intensive server applications.

NEX 6620A User's Guide Rev. B0 0301
Introduction 1-2
1-1 Specifications
Specification
 Model Available
NEX 6620A -- ATX Dual Socket 370 Pentium III DDR Full Function Server Board
NEX 6620 -- ATX Dual Socket 370 Pentium III DDR Server Board Basic Model
NEX 6620VL2 -- ATX Dual Socket 370 Pentium III DDR Server Board for 1U Server
 System Architecture
 StandardATX form factor with Dual Pentium III CPU support
 AIO board with dual channel Ultra 160 SCSI, dual channel Ethernet and VGA
 Next generation server board with industry specification
 CPU Support
 Intel Dual Pentium III CPU with 128/256K cache on die
 Brand New Socket 370 FC-PGA CPU running at 100/133MHz FSB up to 1G+Hz
 Support streaming SIMD instruction
 Main Memory
 Support DDR up to 4GB (Max.)
 DDR Socket x 4
 ECC support (single bit error correction/Multiple bit errors reporting)
 BIOS
 Award System BIOS
 Plug & Play support
 Advanced Power Management support
 Advanced Configuration & Power Interface support
 Jumper less for CPU FSB
 2M bits flash ROM
 Chip Set
 VIAApollo PRO 266 Chipset ( VT 8633 and VT8233)
 100/133MHz FSB support
 PCI V2.2 complied
 Intel 21150AB PCI to PCI Bridge
 On Board VGA
 C&T 69000/69030 PCI mode VGA controller
 2MB/4MB SDRAM on die
 Driver support：Windows 95/98/2000, Windows NT4.0
 On Board LAN
 Intel 82559 Single Ethernet controller ×2
 10 Base T/100 Base TX support, full duplex
 Complied with PCI V2.1, IEEE802.3, IEEE 802.3U

NEX 6620A User's Guide Rev. B0 0301
Introduction 1-3
 Drivers support：DOS/Windows, Windows 95/98/2000, Windows NT4.0, Netware, SCO Open
Server 5.0
 Rear Panel 4 LAN LED (active/link ×2, speed ×2)
 On Board SCSI
 Adaptec AIC 7899 dual channel Ultra 160 SCSI controller
 Brand New Ultra 160 SCSI support
 160MB/s (Max.) transfer rate, up to 12 meter cable
 Backward compatible with Ultra Wide SCSI, SCSI II, etc.
 Drivers support：Windows 95/98/2000, Windows NT4.0, SCO Open Server 5.0
 68 pin SCSI connector ×2
 On board 4 pin header for LED
 On Board I/O
 SMsC LPC 47B 272 super I/O
 SIO ×2, with 2×16C550 UARTs,
 PIO ×1, Bi-directional, EPP/ECP support
 Floppy Disk controller: 5.25″360KB/1.2MB, 3.5″720KB/1.2MB/1.44MB/2.88MB support, 34 pin
connector ×1
 On chip enhanced IDE ×2, PIO up to mode 4, DMA master up to mode 2, Ultra DMA/33/66/100
support, total 4 E.IDE Devices support, 40 pin connector ×2
 On chip keyboard, mouse controller
 On board USB port ×4 ( 2 front 2 rear )
 On board buzzer ×1
 IrDA connector ×1
 On board 2 pin header for I2C
 GPIO (4 in 4 out)
 On board 2 pin header for reset SW, 4 pin for speaker, 5 pin for keylock and power LED
 ACPI Function
 Soft off
 Wake On LAN
 Wake On Keyboard
 Wake On Ring
 RTC alarm wake up
 Suspend to Disk
 On Board Slot
 Total 6 slots, include AGP slot ×1, 32bit/33MHz PCI slot ×5
 On Chip RTC
 VT8233 Internal High precision real time clock/calendar with battery back up
 On Board Solid State Disk Socket
 On board reserved power pin for DOM (DiskOnModule)：4MB~160MB, etc
 System Monitor

NEX 6620A User's Guide Rev. B0 0301
Introduction 1-4
 Winbond W83782D system monitor controller x 2
 8 voltage (For +3.3V, +5V, +12V, −12V, Vtt , Vcore ×2 and V-DIMM 2.5V)
 Two Fan speed (For CPU) and Three FAN Speed ( For System )
 Two temperature (For CPU)
 Drivers support：Windows 95/98, Windows NT4.0/2000
 Power Input
 ATX power connector ×1, ATX V2.03 specification AUX power connector x 1
 Dimensions
 Dimensions：305mm(L) x 244mm(W)
 Back Panel
 PS2 connector ×2 (for Keyboard/Mouse)
 USB port ×2
 RJ45 connector ×2 (for LAN)
 15 pin D-type connector ×1 (for VGA)
 9 pin D-type connector ×2 (for SIO)
 25 pin D-type connector ×1 (for PIO)
 LAN LED ×4 (active/link ×2, speed ×2)
NEX 6620A / NEX 6620 NEX 6620VL2
 Power Requirements ( With Basic configuration running Windows 2000 WIN HCT system stress )
+3.3V：1A
+5V：13A
+12V：0.8A
5VSTBY：0.13A
 Environments
 Operating temperatures：0°C to 60°C
 Storage temperatures：-20°C to 80°C
 Relative humidity：10% to 90% (Non-condensing)
 Certification
 CE approval
 FCC Class A

NEX 6620A User's Guide Rev. B0 0301
Switches and Connectors 2-1
Chapter 2 Switches and Connectors
2-1 Main Board Layout
This chapter gives the definitions and shows where to locate the positions of switches and connectors.

NEX 6620A User's Guide Rev. B0 0301
Switches and Connectors 2-2
2-2 Connector Pin Define & Jumper Setting

NEX 6620A User's Guide Rev. B0 0301
Switches and Connectors 2-3
 CN1 : Dual High PC99 Complied PS/2 Connector
Pin No. Description Pin No. Description
K1 Keyboard Data M1 Mouse Data
K2 NC M2 NC
K3 Chassis Ground M3 Chassis Ground
K4 +5V Standby M4 +5V Standby
K5 Keyboard Clock M5 Mouse Clock
K6 NC M6 NC
K7 Chassis Ground M7 Chassis Ground
K8 Chassis Ground M8 Chassis Ground
 CN2 : ATX Power Connector
Pin No. Description Pin No. Description
1 +3.3V 11 +3.3V
2 +3.3V 12 -12V
3 Ground 13 Ground
4 +5V 14 PS_ON
5 Ground 15 Ground
6 +5V 16 Ground
7 Ground 17 Ground
8 PWR_OK 18 -5V
9 5V_Standby 19 +5V
10 +12V 20 +5V
 CN3 : Dual High PC99 Complied USB Connector for USB1, USB2
Pin No. Description Pin No. Description
1 +5V Standby 2 USB1 Plus
3 USB1 Minus 4 Chassis Ground
5 +5V Standby 6 USB2 Plus
7 USB2 Minus 8 Chassis Ground

NEX 6620A User's Guide Rev. B0 0301
Switches and Connectors 2-4
 CN4 : Parallel Port & VGA ( DB25 + DB15 Connector )
Pin No. Description Pin No. Description
1 Strobe# 2 Data 0
3 Data 1 4 Data 2
5 Data 3 6 Data 4
7 Data 5 8 Data 6
9 Data 7 10 Acknowledge
11 Busy 12 Paper Empty
13 Printer Select 14 Auto Form Feed#
15 Error# 16 Initialize
17 Printer Select IN# 18 Chassis Ground
19 Chassis Ground 20 Chassis Ground
21 Chassis Ground 22 Chassis Ground
23 Chassis Ground 24 Chassis Ground
25 Chassis Ground 26 Red
27 Green 28 Blue
29 N/A 30 Ground
31 Chassis Ground 32 Chassis Ground
33 Chassis Ground 34 +5V
35 Ground 36 Pull-up
37 DDC Data 38 Horizontal Sync.
39 Vertical Sync. 40 DDC Clock
41 Chassis Ground 42 Chassis Ground
43 Chassis Ground 44 Chassis Ground

NEX 6620A User's Guide Rev. B0 0301
Switches and Connectors 2-5
 CN5 : Stand-alone VGA DB-15 Connector
Pin No. Description Pin No. Description
1 Red 2 Green
3 Blue 4 N/A
5 Ground 6 Chassis Ground
7 Chassis Ground 8 Chassis Ground
9 +5V 10 Ground
11 Pull-up 12 DDC Data
13 Horizontal Sync. 14 Vertical Sync.
15 DDC Clock 16 Chassis Ground
17 Chassis Ground
 CN6 : SIO Dual High DB-9 Connector
Pin No. Description Pin No. Description
1 Data Carrier Detect 2 2 Receive Data 2
3 Transmit Data 2 4 Data Terminal Ready 2
5 Chassis Ground 6 Data set Ready 2
7 Request to Send 2 8 Clear to Send 2
9 Ring Indicator 2 10 Data Carrier Detect 1
11 Receive Data 1 12 Transmit Data 1
13 Data Terminal Ready 1 14 Chassis Ground
15 Data set Ready 1 16 Request to Send 1
17 Clear to Send 1 18 Ring Indicator 1
19 Chassis Ground 20 Chassis Ground
21 Chassis Ground 22 Chassis Ground
 CN7 : Stand-alone SIO DB-9 Connector
Pin No. Description Pin No. Description
1 Data Carrier Detect 2 2 Receive Data 2
3 Transmit Data 2 4 Data Terminal Ready 2
5 Chassis Ground 6 Data set Ready 2
7 Request to Send 2 8 Clear to Send 2
9 Ring Indicator 2 10 Chassis Ground
11 Chassis Ground

NEX 6620A User's Guide Rev. B0 0301
Switches and Connectors 2-6
 CN8: Dual High RJ45 LAN Connector
Pin No. Description Pin No. Description
1 LAN1 TX+ 2 LAN1 TX-
3 LAN1 RX+ 4 TERMPLANE
5 TERMPLANE 6 LAN1 RX-
7 TERMPLANE 8 TERMPLANE
9 LAN2 TX+ 10 LAN2 TX-
11 LAN2 RX+ 12 TERMPLANE
13 TERMPLANE 14 LAN2 RX-
15 TERMPLANE 16 TERMPLANE
17 Chassis Ground 18 Chassis Ground
19 Chassis Ground 20 Chassis Ground
21 Chassis Ground 22 Chassis Ground
23 Chassis Ground 24 Chassis Ground
 CN9 : ATX AUX Power Connector
Pin No. Description Pin No. Description
1 Ground 2 Ground
3 Ground 4 +3.3V
5 +3.3V 6 +5V

NEX 6620A User's Guide Rev. B0 0301
Switches and Connectors 2-7
 CN10, CN11 : IDE Connector
Pin No. Description Pin No. Description
1 Reset # 2 Ground
3 Data 7 4 Data 8
5 Data 6 6 Data 9
7 Data 5 8 Data 10
9 Data 4 10 Data 11
11 Data 3 12 Data 12
13 Data 2 14 Data 13
15 Data 1 16 Data 14
17 Data 0 18 Data 15
19 Ground 20 NC
21 DMA REQ 22 Ground
23 IOW 24 Ground
25 IOR 26 Ground
27 IOCHRDY 28 Pull Down
29 DMA ACK 30 Ground
31 Interrupt 14 32 NC
33 Disk Address 1 34 DMA66 Detect
35 Disk Address 0 36 Disk Address 2
37 HDC CS100 38 HDC CS300
39 HDD Active Led 40 Ground

NEX 6620A User's Guide Rev. B0 0301
Switches and Connectors 2-8
 CN12, CN14 : SCSI 68 Pin Connector
Pin No. Description Pin No. Description
1 Plus Data12 2 Plus Data13
3 Plus Data14 4 Plus Data15
5 Plus High Byte Parity 6 Plus Data0
7 Plus Data1 8 Plus Data2
9 Plus Data3 10 Plus Data4
11 Plus Data5 12 Plus Data6
13 Plus Data7 14 Plus Low Byte Parity
15 Ground 16 Differential Sense
17 +5V 18 +5V
19 NC 20 Ground
21 Plus Attention 22 Ground
23 Plus Busy 24 Plus Acknowledge
25 Plus Reset 26 Plus Message
27 Plus Select 28 Plus Command / Data
29 Plus Request 30 Plus In / Out
31 Plus Data8 32 Plus Data9
33 Plus Data10 34 Plus Data11
35 Minus Data12 36 Minus Data13
37 Minus Data14 38 Minus Data15
39 Minus High Byte Parity 40 Minus Data0
41 Minus Data1 42 Minus Data2
43 Minus Data3 44 Minus Data4
45 Minus Data5 46 Minus Data6
47 Minus Data7 48 Minus Low Byte Parity
49 Ground 50 Ground
51 +5V 52 +5V
53 NC 54 Ground
55 Minus Attention 56 Ground
57 Minus Busy 58 Minus Acknowledge
59 Minus Reset 60 Minus Message
61 Minus Select 62 Minus Command / Data
63 Minus Request 64 Minus In / Out
65 Minus Data8 66 Minus Data9
67 Minus Data10 68 Minus Data11

NEX 6620A User's Guide Rev. B0 0301
Switches and Connectors 2-9
 CN13 : Floppy Disk Connector
Pin No. Description Pin No. Description
1 Ground 2 Drive Density Select 0
3 Ground 4 NC
5 Ground 6 Drive Density Select 1
7 Ground 8 Index Pulse Input
9 Ground 10 Motor On 0
11 Ground 12 Drive Select 1
13 Ground 14 Drive Select 0
15 Ground 16 Motor On 1
17 Ground 18 Step Direction
19 Ground 20 Step Pulse
21 Ground 22 Write Disk Data
23 Ground 24 Write Gate
25 Ground 26 Track 0
27 Ground 28 Write Protected
29 NC 30 Read Disk Data
31 Ground 32 Head Select
33 NC 34 Disk Change
 J1, J2 : 2.54mm Single Ramp CPU FAN Connector
Pin No. Description Pin No. Description
1 Ground 2 +12V
3 Sense
 J4 : 2.54mm 1x2 JST for Disk On Moudle Power Connector
Pin No. Description Pin No. Description
1 Ground 2 +5V
 J7 : 1x5 Pin Header for Keylock & Power LED
Pin No. Description Pin No. Description
1 Pull High 2 NC
3 Ground 4 Active Signal
5 Ground

NEX 6620A User's Guide Rev. B0 0301
Switches and Connectors 2-10
 J8 : 1x4 Pin Header for SCSI LED
Pin No. Description Pin No. Description
1 Pull-up 2 Channel A Active#
3 Pull-up 4 Channel B Active#
 J9 : 1x2 Pin Header for ACPI Function S0_LED
Pin No. Description Pin No. Description
1 Ground 2 Pull-up
 J10 : 1x2 Pin Header for IDE LED
Pin No. Description Pin No. Description
1 Pull-up 2 Active signal
 J11 : 1x2 Pin Header for Intruder SW
Pin No. Description Pin No. Description
1 Active signal 2 Ground
 J12 : 1x2 Pin Header for Reset SW
Pin No. Description Pin No. Description
1 Ground 2 Reset
 J13 : 1x2 Pin Header for Power Button
Pin No. Description Pin No. Description
1 Active signal 2 Ground
 J14 : 1x4 Pin Header for Buzzer / External Speaker ( * Pin 3-4 Short For Internal Buzzer )
Pin No. Description Pin No. Description
1 +5V 2 NC
3 Onboard BZ Active Signal 4 External Speaker Active Signal

NEX 6620A User's Guide Rev. B0 0301
Switches and Connectors 2-11
 J15 : 2x4 Pin Header for Digital I/O ( Refer to Appendix for Control Table )
Pin No. Description Pin No. Description
1 Digital input 1 2 Digital output 1
3 Digital input 2 4 Digital output 2
5 Digital input 3 6 Digital output 3
7 Digital input 4 8 Digital output 4
 J20 : 1x5 Pin Header for External IrDA
Pin No. Description Pin No. Description
1 +5V 2 NC
3 IR Receiver 4 Ground
5 IR Transceiver
 J21 : 2.54mm 1x6 JST Connector for USB3, USB4
Pin No. Description PIN No. Description
1 +5V Standby 2
USB3 Minus
3 USB3 Plus 4
USB4 Minus
5 USB4 Plus 6
EMI Ground
 J22, J23, J24 : 2.54mm 1x3 JST CASE FAN Connector
Pin No. Description Pin No. Description
1 Sense 2 +12V
3 Ground
 J25 : 1x2 Pin Header for BIOS Hardware Protection
Pin No. Description Pin No. Description
1 Ground 2 Active signal
 J26 : 1x2 Pin Header for I2C (SMBUS)
Pin No. Description Pin No. Description
1 Data 2 Clock

NEX 6620A User's Guide Rev. B0 0301
Switches and Connectors 2-12
 JP1 : 1x3 Jumper for On Board RTC ( * = Default )
Pin No. Description
*1, 2 Short Operation Mode
2, 3 Short Clear CMOS
.

NEX 6620A User's Guide Rev. B0 0301
Capability Expanding 3-1
Chapter 3 Capability Expanding
This chapter explains how you can expand capability of your CPU board in such aspects as system memory
and CPU.
3-1 System Memory
NEX 6620A series can install to 4 Double Data Memory Module (DDR) DIMM sockets and supports the
maximum memory size up to 4GB. The architecture to provide the best choice for performance vs. stability
Installing DDR DIMM
To install the DDR DIMM’s, first make sure the two handles of the DIMM socket are in the “open” position,
i.e. the handles stay outward. Slowly slide the DIMM modules along the plastic guides in the both ends of
the socket. Then press the DIMM module down right into the socket, until a click is heard. That means
the two handles automatically locked the memory modules into the right position of the DIMM socket
Remove DDR DIMMs
To take away the memory module, just push the both handles outward, the memory module will be ejected
by the mechanism in the socket.
184 pins DDR SDRAM DIMM Module.
Please check the Position before Install the Module.