Ampro Corporation Littleboard 550 Miscellaneous, Real Time Clock RTC, Temperature Monitoring

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Chapter 3

Hardware

Miscellaneous

Real Time Clock (RTC)

The LittleBoard 550 contains a Real Time Clock (RTC) and along with the CMOS RAM are backed up with a Lithium Battery. If the battery is not present or has failed the BIOS has a battery-free boot option to complete the boot process.

Temperature Monitoring

The MAX1617 performs the temperature monitoring function and has an inputs from the thermal diode in the VIA Eden CPUs. The SMBus is connected to a dedicated thermal alert pin in the MAX1617 and the other devices on the SMBus, including the Southbridge (VT82C686B).

NOTE

The LittleBoard 550 requires a heatsink for all VIA Eden CPUs and the

 

Twister-T Northbridge, but no fans.

 

 

Oops! Jumper (BIOS Recovery)

The Oops! jumper is provided in the event the BIOS settings you’ve selected prevent you from booting the system. By using the Oops! jumper you can prevent the current BIOS settings in the EEPROM from being loaded, forcing the use of the default settings. Connect the DTR pin to the RI pin on serial port 1 (COM 1) prior to boot up to prevent the present BIOS settings from loading. After booting with the Oops! jumper in place, remove the Oops! jumper and go into BIOS Setup. Change the desired BIOS settings, or select the default settings, and save changes before rebooting the system.

To convert the Serial A interface to an Oops! jumper, short together the DTR (7) and RI (8) pins on Serial A (J11) header for Serial Port 1. As an alternate, short the equivalent pins, 4 and 9, on the Serial Port 1 DB9 connector as shown in Figure 3-2.

Serial A Interface (J11)

19

9 7 5 3 1

1

2

3

4

5

 

Or

Standard DB9 Serial

 

 

 

 

for Serial Port 1

 

Port Connector (Female)

 

 

 

 

(or COM1 Port)

20

10 8 6 4 2

Rear View

 

 

 

 

Top View

6

7

8

9

 

 

 

 

 

Figure 3-2. Oops! Jumper Connection

LB550Oopsjumper

Serial Console

The LittleBoard 550 supports the serial console (or console redirection) feature. This I/O function is provided by an ANSI-compatible serial terminal, or the equivalent terminal emulation software running on another system. This can be very useful when setting up the BIOS on a production line for systems that are not connected to a keyboard and display.

Serial Console Setup

The serial console feature is implemented by connecting a standard null modem cable or a modified serial cable (or “Hot Cable”) between one of the serial ports, such as Serial 1 (J11A), and the serial terminal or a PC with communications software. The BIOS Setup Utility controls the serial console settings on the LittleBoard 550. Refer to Chapter 4, BIOS Setup for the settings of the serial console option, the serial terminal, or PC with communications software and the connection procedure.

Hot (Serial) Cable

To convert a standard serial cable to a Hot Cable, certain pins must be shorted together at the Serial port connector or at the DB9 connector. Short together the RTS (4) and RI (8) pins on Serial A (J11) header,

LittleBoard 550

Reference Manual

59

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Contents LittleBoard Single Board Computer Reference Manual Audience Assumptions Contents Appendix a List of Tables Table A-1 Reference Material SpecificationsPurpose of this Manual Other LittleBoard Products Related Ampro ProductsLittleBoard 550 Support Products Other Ampro Products Chapter EBX Architecture Product OverviewStacking PC/104 Modules with the LittleBoard Product DescriptionBoard Features Chapter Chapter ATA Block DiagramChip Type Mfg Model Description Function Major Integrated Circuits ICsVIA CPUJack # Signal Description Connector DefinitionsAdditional Components DIMM1Northb Default Jumper # Installed Removed/InstalledIndicator Definition Jumper DefinitionsThb Dimension SpecificationsPhysical Specifications LittleBoard 550 Dimensions Top view, #1 Mechanical Specifications115 705 415 730 200 050 350 800 600 385 345 Thermal/Cooling Requirements Power SpecificationsEnvironmental Specifications Reference Manual LittleBoard USB OverviewMemory CPU U1Sdram Memory DIMM1 Flash Memory U17Memory Map Interrupt Channel AssignmentsBase Address Function Address MapAddress hex Subsystem VGAPC/104-Plus Interface J21 Pin # Signal Input Description OutputREQ0 IDSEL0GNT1 CLK2CLK0 REQ2Intd IntaREQ1 IDSEL1GNT2 CLK3IDSEL3 IDSEL2GNT0 CLK1PC/104 Interface J1A,B,C,D Pin # Signal Description J1 Row aPin # Signal Descriptions J1 Row B DRQ3 DACK3DACK1 DRQ1Pin # Signal Descriptions J1 Row D Pin # Signal Descriptions J1 Row CIRQ14 IRQ15DACK0 DRQ0IDE Interface J12, J17 Pin # Signal DescriptionPdiow PdreqPdior PdiordySDD6 SDD8SDD9 SDD5SDA0 SDA1SDA2 SDCS1#VCC CompactFlash Adapter J23PDCE1 Pdrst PDCE2Floppy Drive Interface J14 Parallel Port Interface J15 Pin # Signal In/Out DescriptionRS485 Serial Port Implementation Serial Interfaces J11, J13DSR1 DCD1RXD1 RTS1DTR2 CTS2DCD3 DSR3DSR4 DCD4RXD4 RTS4Utility 1 Interface J16 Utility InterfacesSystem Management Bus SMBus Utility 2 Interface J24Mouse Interface Sdram Eprom USB Signals USB0 and USB1Component Address Binary Pwrbt SuscBatlow MdataUtility 3 Interface J18 USB Signals USB2 and USB3TX+ Ethernet Interfaces J7, J32Audio Interface J28 Videognd VideolVideor CDLCRT Interface Video Interfaces J3, J4, J5, J31LCD Interface Enavdd Lvds Interface Pin # Signal Description Line ChannelOops! Jumper Bios Recovery Temperature MonitoringMiscellaneous Real Time Clock RTCHot Cable Jumper Watchdog TimerPower Monitor Power Interface J10CPU Fan TAGReference Manual LittleBoard Introduction Accessing Bios Setup VGA DisplayBios Setup Menu Item/Topic Accessing Bios Setup Serial ConsoleBios Setup Opening Screen Bios MenusDrive Configurations and Boot Options Bios Configuration ScreenDate & Time Drive Assignment# of Floppy Drives Bios Settings Drive and Boot Options Boot OrderUser Interface Keyboard and Mouse ConfigurationUser Interface Options Memory Memory Control OptionsAdvanced features Power Management and Advanced User OptionsPower Management On-Board Serial Ports On-Board LPT Port On-Board Video Video, Flat Panel, and Audio OptionsOn-Board Controllers PCI, Plug n Play, and Interrupt Assignments Chapter Bios Setup Chapter Bios Setup Chapter Bios Setup Converting the Splash Screen File Splash Screen CustomizationSplash Screen Image Requirements \splashconvert convert.idf Method Contact Information Appendix a Technical SupportAppendix a Technical Support Connector Designation Pin # Mfg Part Number Appendix B Appendix C LAN Boot Option Accessing PXE Boot Agent Bios Setup PXE Boot Agent Bios SetupTCP/IP Configuration PXE Boot Agent Setup ScreenPXE Configuration RPL Configuration NetWare ConfigurationCRT CD-ROMPost Documentation and Support Software Doc & SW CD-ROMWDT Supported featuresReference Manual LittleBoard