Compaq MSB900L user manual Timers and Counters, Programmable Timers, RTC Real Time Clock, Watchdog

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DIGITAL-LOGIC AG

MSB900/L Detailed Technical Manual V1.0

5.6.Timers and Counters

5.6.1.Programmable Timers

An 8253 compatible timer/counter device is also included in the board's ASIC device. This device is utilized in precisely the same manner as in a standard AT implementation. Each channel of the 8253 is driven by a 1.190 MHz clock, derived from a 14.318 MHz oscillator, which can be internally divided in order to provide a variety of frequencies.

Timer 2 can also be used as a general purpose timer if the speaker function is not required.

Timer Assignment

Timer

Function

0

1

2

ROM-BIOS clock tick (18.2Hz)

DRAM refresh request timing (15 µs)

Speaker tone generation time base

5.6.2.RTC (Real Time Clock)

An AT compatible date/time clock is located within the chipset. The device also contains a CMOS static RAM, compatible with that in standard ATs. System configuration data is normally stored in the clock chip's CMOS RAM in a manner consistent with the convention used in other AT compatible computers. To attach an external battery on a MSB900L board refer to section 2.11.1.

5.6.3.Watchdog

The watchdog timer detects a system crash and performs a hardware reset. After power up, the watchdog is always disabled as the BIOS does not send strobes to the watchdog. In case the user wants to take advan- tage of the watchdog, the application must produce a strobe at least every 800 ms. If no strobe occurs within the 800 ms, the watchdog resets the system.

For more information, please refer to the driver/software/BIOS manual “GEODE_LX800-LX900” on the Prod- uct CD. The watchdog feature is integrated in the INT15 function.

There are some programming examples available:

Product CD-Rom or customer download area: \tools\SM855\int15dl\…

5.6.4.ROM-BIOS Sockets

An EPROM socket with 8bit wide data access normally contains the board’s AT compatible ROM-BIOS. The socket takes a 29F020 EPROM (or equivalent) device. The board's wait-state control logic automatically in- serts four memory wait states in all CPU accesses to this socket. The ROM-BIOS sockets occupy the mem- ory area from C0000H through FFFFFh; however, the board's ASIC logic reserves the entire area from C0000h through FFFFFh for onboard devices, so that this area is already usable for ROM-DOS and BIOS expansion modules. Consult the appropriate address map for the MICROSPACE PC-Product ROM-BIOS sockets.

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Contents MSB900/L SBCAbout this Manual and How to Use It MSB900/L Detailed Technical ManualTable of Contents 10.1 Preface TrademarksDisclaimer Environmental Protection StatementRecycling Information Limited Two Year WarrantyTechnical Support Explanation of Symbols CE ConformityApplicable Documents and Standards For Your Safety RoHS CommitmentRoHS Compliant Production Process RoHS Compatible Product DesignWeee Application Swiss Quality Swiss Association for Quality and Management Sys- temsStandard Features of the MSB900/L Unique FeaturesOverview DMAMSB900 Block Diagram MSB900/MSB900L specifications Mass Storage Specification Standard AT Interfaces Specification NamePeripheral Extension Specification Power Supply SpecificationExamples of Ordering Codes Related Application NotesDimensions & Diagrams MSB900/LDIGITAL-LOGIC AG DIGITAL-LOGIC AG DIGITAL-LOGIC AG Board / Version Unit Tolerance Date / Author MSB800CON Part NrMm millimeter + / 0.1mm 25.10.2006 / BRR MSB900/L Incompatibilities to a standard PC/AT High Frequency Radiation to meet EN55022Battery-Lifetime BUS SignalsExternal battery assembling for the MSB900L Addressing PCI DevicesThis Bios history is not for the following products Version Date Status ModificationsPower Requirements Boot TimeTest environment for power consumption measurement Detailed System DescriptionCPU, Boards and RAMs InterfacesControllers Serial Ports COM1-COM2Floppy Disk Interface Interrupt ControllersTimers and Counters Programmable TimersROM-BIOS Sockets RTC Real Time ClockBios Cmos Setup Cmos RAM MapDevice MapCmos Map Cmos Map Bit = Internal IDE Controller Disable Password Eeprom saved Cmos Setup Bits = Reserved 34h Minor CPU RevisionMemory & I/O Map Eeprom Memory for SetupSystem Memory Map System I/O map Addr Function Size CommentIf KEL Memory Offset 100h0 = MSB900/L Detailed Technical Manual Map LPCMSR bit enables/disables into I/O VGA/LCD Controller of the Geode LX900 Resolution Col. Dept FrequencyGraphic Modes Description of the Connectors Connector Structure Pin RemarksVideo Input Flat cableTop view of the MSB900/L Bottom view of the MSB900/L Pin Signal Power Supply Pin Signal Shield Power supplyX14 X15 Operator Panel / Flat Panel bottom side GND LVDSYAP0 LVDSYAM0 GND LVDSYAP1 LVDSYAM1GND LVDSYAP2 LVDSYAM2 GND Lvdsclkam LvdsclkapX31 Keyboard PS/2 and Mouse Utility Connector Connector and Adapter Mini- DIN PS/2 6 PC RemarksX33 10/100 BASE-T Interface Connector Pin Signal CAT X34 10/100 BASE-T Interface Connector Pin SignalX50 USB 1 Connector Dual-USB Pin Signal Remarks X39 Serial Port COM2 Header onboard SUB connector SignalX51 USB 2 Connector Dual USB Pin Signal Remarks X60 IDE Interface Pin Signal X52 USB Udoc not assembledPin Power supply GND X101 PCI-104 BUS Interface Pin Dlag boards have them as NC not connected X110 LPC-PortX301 VGA Monitor CRT-Signals 15pins High-Density DSub Pin X230 JTAG-Port Pin SignalTCK TMS TDI TDO Reload Default Bios Settings DisabledJumper Locations on the Board Jumpers on MSB900/LDIGITAL-LOGIC AG Cable Interfaces Hard Disk Cable 44pinPin Signal LPT1 25pin D-Sub female Pin Signal COM1 9pin D-Sub maleCOM1/LPT Serial Interface Cable Pin Signal COM2 9pin D-Sub male COM2 Serial Interface CableThermal Analysis for Case Integration Thermal SpecificationsMHz Uin Assembly Views MSB900/LDIGITAL-LOGIC AG Mechanical Dimensions Combined standard Dhcp and redirection services PXE-BOOT and PXE-SETUP in the BiosSeparate standard Dhcp and redirection services DIGITAL-LOGIC AG PXE-LICENSE Order Product Currency Circle oneMPC20 USD CHFBios Cmos CmosDram EMI / EMCSQS ROM-BIOS RTCUdoc USB VGA

MSB900, MSB900L specifications

The Compaq MSB900 and MSB900L are noteworthy entries in the realm of personal computing, particularly for their cutting-edge features and innovative technologies that defined their era. Positioned as versatile desktop solutions, both models have garnered attention for their robust performance and user-friendly design.

The Compaq MSB900 is equipped with a powerful processor that enhances multitasking efficiency. Its architecture supports a range of demanding applications, making it suitable for both professional and everyday use. Users can expect a seamless experience whether working on complex spreadsheets or engaging in casual gaming.

In terms of memory, the MSB900 boasts expandable RAM options, allowing users to enhance their system's capabilities as needed. The availability of multiple RAM slots provides flexibility for upgrades, ensuring the system can keep pace with future software requirements. Storage solutions in the MSB900 include high-speed hard drives, which contribute to fast boot times and robust data retrieval.

The MSB900L variant steps up the performance with additional features tailored for power users. It incorporates advanced graphics capabilities, offering superior visual experiences for gaming and multimedia applications. The dedicated graphics card provides a substantial boost in rendering performance, making it a worthy choice for graphic designers and video editors.

One of the standout characteristics of the MSB900 and MSB900L is their commitment to connectivity. Both models come equipped with a wide array of ports, ensuring compatibility with various peripherals. This includes USB ports for modern devices, Ethernet ports for wired networking, and legacy connections for older technology, catering to a diverse user base.

Energy efficiency is another key feature of these models. Designed with power-saving technologies, the Compaq MSB900 and MSB900L aim to reduce energy consumption without compromising performance. This focus not only helps to lower operating costs but also aligns with growing consumer preferences for environmentally conscious products.

In summary, the Compaq MSB900 and MSB900L offer a compelling combination of performance, expandability, and connectivity. Their innovative features and user-friendly design make them suitable for a wide range of users, from casual consumers to professional power users. As a testament to Compaq’s legacy, these models continue to be regarded as reliable choices in the personal computing landscape.
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