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MB875
®
Intel 852GM Chipset
Custom Motherboard
for 1U Rackmount
USER’S MANUAL
Version 1.0
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Acknowledgments Award is a registered trademark of Award Software International, Inc. PS/2 is a trademark of International Business Machines Corporation. Intel and Pentium M are registered trademarks of Intel Corporation. Microsoft Windows is a registered trademark of Microsoft Corporation. Winbond is a registered trademark of Winbond Electronics Corporation. All other product names or trademarks are properties of their respective owners. ii MB890 User’s Manual
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Table of Contents Introduction ....................................................... 1 Product Description ............................................................. 1 Checklist .............................................................................. 2 MB875 Specifications ......................................................... 3 Board Dimensions ............................................................... 4 Installations ...............................................
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The MB875 Motherboard The MB875 Edge Connectors iv MB890 User’s Manual
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INTRODUCTION Introduction Product Description The MB875 is a versatile motherboard with four Gigabit Ethernets that is designed for SOHO network security applications. Optimized for network performance, this scalable platform is based on the Intel(R) 852GM chipset and supports Intel(R) Pentium(R) M / Celeron(R) M processors of up to 2.0GHz speeds with front size bus of 400MHz. System memory can support up to 2GB of DDR266 DIMM modules. The MB875 uses the highly efficient Intel(R)
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INTRODUCTION Checklist Your MB875 package should include the items listed below. ® • The MB875 Pentium M Mini-ITX motherboard • This User’s Manual • 1 CD containing chipset drivers and flash memory utility • Option Cable VGA4K USB2K-4 PK1-2K PK1K PS2D 2 MB890 User’s Manual
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INTRODUCTION MB875 Specifications [ CPU Type Intel ULV Celeron M CPU or Intel Pentium M CPU CPU Voltage 0.700V ~ 1.708V 600MHz CPU Speed CPU FSB 400MHz Cache 512K Level 2 (CPU integrated) CPU Socket BGA on board or socket 479 Chipset Intel 852GM Chipset: GMCH: 852GM 732-pin mFCBGA ICH4: 82801DB 421-pin BGA, Green /APM APM1.2 BIOS Award BIOS, supports ACPI Function Memory Two DDR266/333 DIMM sockets, support up to 2GB SDRAM VGA 2x8 pins pin-header x 1 for VGA LAN
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INTRODUCTION Board Dimensions 4 MB890 User’s Manual
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INSTALLATIONS Installations This section provides information on how to use the jumpers and connectors on the MB875 in order to set up a workable system. The topics covered are: Installing the CPU ........................................................................ 6 Installing the Memory .................................................................. 7 Setting the Jumpers ...................................................................... 8 Connectors on MB875 ..............
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INSTALLATIONS Installing the CPU ® The MB875 board supports a Socket 479 processor socket for Intel ® ® Pentium M or Celeron M processors. The processor socket comes with a screw to secure the processor. As shown in the left picture below, loosen the screw first before inserting the processor. Place the processor into the socket by making sure the notch on the corner of the CPU corresponds with the notch on the inside of the socket. Once the processor has slide into the socket, fas
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INSTALLATIONS Installing the Memory The MB875 board supports one DDR memory sockets for a maximum total memory of 1GB in DDR memory type. The memory module capacities supported are 128MB, 256MB, 512MB and 1GB. The ® following table lists the supported DDR DIMM configurations. Intel 852GM supports configurations defined in the JEDEC DDR DIMM specification only. Non-JEDEC standard DIMMs such as double-sided x16 DDR SDRAM DIMMs are not supported. Installing and Removing Memory Modul
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INSTALLATIONS Setting the Jumpers Jumpers are used on MB875 to select various settings and features according to your needs and applications. Contact your supplier if you have doubts about the best configuration for your needs. The following lists the connectors on MB875 and their respective functions. Jumper Locations on MB875 .......................................................... 9 JP1: CPU Host Clock.................................................................... 10 JP2:
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INSTALLATIONS Jumper Locations on MB875 Jumpers on MB875 ........................................................................... Page JP1: Clear CMOS Contents ................................................................. 10 JP2: Watchdog Timer Settings ............................................................ 10 JP4: Compact Flash Slave/Master ....................................................... 10 JP5: Processor Operating Frequency ...................................
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INSTALLATIONS JP1: Clear CMOS Contents Use JP1 to clear the CMOS contents. Note that the ATX-power connector should be disconnected from the board before clearing CMOS. JP1 Setting Function Pin 1-2 Normal Short/Closed Pin 2-3 Clear CMOS Short/Closed JP2: Watchdog Timer Settings JP2 Setting Function Ethernet default: Eth0 & Eth1 None Bypass. Pin 1-3 & 2-4 System will bypass LANs upon the timeout Short of Watchdog timer Ethernet default: Eth0 & Eth1 Bypas
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INSTALLATIONS JP5: Processor Operating Frequency CPU Operating JP5 Frequency 133MHz Open 100MHz (default) Close JP7: Power ON Setting JP7 Setting Function Pin 1-2 Power on by system Short/Closed button Pin 2-3 Power on by power Short/Closed supply AC on MB890 User’s Manual 11
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INSTALLATIONS Connectors on MB875 The connectors on MB875 allows you to connect external devices such as keyboard, floppy disk drives, hard disk drives, printers, etc. The following table lists the connectors on MB875 and their respective functions. Connector Locations on MB875 .......................................................... 13 J1: VGA CRT Connector ..................................................................... 14 J2: COM2 Serial Port .......................
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INSTALLATIONS Connector Locations on MB875 Connectors on MB875 ...................................................................... Page J1: VGA CRT Connector .................................................................... 14 J2: COM2 Serial Port .......................................................................... 14 J4: USB Connector .............................................................................. 14 J5: SATA HDD Connector .................................
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INSTALLATIONS J1: VGA CRT Connector Signal Name Pin Pin Signal Name R 1 2 +5V G 3 4 GND B 5 6 NC NC 7 8 SPD1 GND 9 10 Hsync GND 11 12 Vsync GND 13 14 SPCLK GND 15 J2: COM2 Serial Port Pin # Signal Name (RS-232) 1 DCD, Data carrier detect 2 RXD, Receive data 3 TXD, Transmit data 4 DTR, Data terminal ready 5 Ground 6 DSR, Data set ready 7 RTS, Request to send 8 CTS, Clear to send 9 RI, Ring indicator 10 No Connect. J4: USB Connector S
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INSTALLATIONS J5: SATA HDD Connector Pin # Signal Name 1 Ground 2 TX+ 3 TX- 4 Ground 5 RX- 6 RX+ 7 Ground J6: SATA HDD Connector Pin # Signal Name 1 Ground 2 TX+ 3 TX- 4 Ground 5 RX- 6 RX+ 7 Ground J7: COM3 Serial Port Pin # Signal Name (RS-232) 1 DCD, Data carrier detect 2 RXD, Receive data 3 TXD, Transmit data 4 DTR, Data terminal ready 5 Ground 6 DSR, Data set ready 7 RTS, Request to send 8 CTS, Clear to send 9 RI, Ring indicator 10 No Connec
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INSTALLATIONS J8: COM4 Serial Port Pin # Signal Name (RS-232) 1 DCD, Data carrier detect 2 RXD, Receive data 3 TXD, Transmit data 4 DTR, Data terminal ready 5 Ground 6 DSR, Data set ready 7 RTS, Request to send 8 CTS, Clear to send 9 RI, Ring indicator 10 No Connect. J9: Case Open Detect Header Pin # Signal Name 1 Case Open Detect 2 Ground J10: ATX Power Connector 11 1 Signal Name Pin # Pin # Signal Name 3.3V 11 1 3.3V -12V 12 2 3.3V Ground 13 3
