Main
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Table of Contents
Preface
Introduction
Product Reference
Page
Technical Specifications
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Preface
Introduction
Technical Support
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Chapter 1
Introduction
General Description
Features
CPU/Motherboard
VL-Bus Flat Panel/CRT Display Controller
Enhanced Embedded-PC BIOS
Serial Ports
Enhanced Parallel Port
Floppy Interface
IDE Interface
Compact Flash Disk
Ethernet LAN Interface
Byte-Wide Socket and Solid State Disk (SSD)
Modular PC/104 Expansion Bus
Enhanced Reliability
HALT Testing
Software
Little Board Development Platform
Chapter 2 22
2
Product Reference
Overview
Interface Connector Summary
Connector Function Size Key Pin
Connectors
Product Reference
Figure 21. Connector and Jumper Locations
23
Shaded connector pins indicate key pins. Default settings for jumpers are in parenthesis.)
Jumper Configuration Options
Jumper Group Function Default
System I/O Map
I/O Address Function
DC Power
Pin Connection
Little Board/486e
Figure 22. Power Connector Wiring
J10
Power Requirements
Backup Battery
Cooling Requirements
Powerfail Monitor
DRAM
System Memory Map
Memory Address Function
Expanded Memory and Extended Memory
Serial Ports (J11, J13)
RS-232C Serial Ports
RS-485 Serial Port
I/O Addresses
Port I/O Address Interrupt
Interrupt Assignments
ROM-BIOS Installation of the Serial Ports
Serial Port Connectors (J11, J13)
Ports Pin Signal Name Function In/Out DB25
Pin DB9
Configuring Serial 2 for RS-485 (J6, W5, W6)
Pin Signal Name
Figure 26. Serial 2 Interface Selection
RS-232 W5 RS-485
W4 Result
RS-485 Twisted-Pair Cabling Using RJ11 Connectors
Pin Signal Standard
J6 Pin RJ11
Wire Color
Using the RS-485 Interface
Figure 27. RS-485 Interface Wiring Interconnection Scheme Examples
One-way Broadcast
Simple Bi-Directional Communication
Multidrop Network
Serial Console
Hex Command
COM Port Table
Serial Handshake
Serial Booting and Serial Programming
Using a Serial Modem
Bi-Directional Parallel Port
Address Register Name Primary Secondary
I/O Addresses
Selection I/O Address Interrupts
ROM-BIOS Installation of Parallel Ports
Standard and General Purpose I/O Operation
Signal Type Number of Lines Function Output Drive
Parallel Port Interrupt
Parallel Port Interrupt Enable
Register Bit Signal Name or Function In/Out Active
Pin DB25F
High/Low J15
Parallel Port Connector (J15)
J15 Pin Signal Name Function In/Out DB25
Register Bit Definitions
Signal Name Full Name Description
Floppy Disk Interface
Capacity Drive Size Tracks Data Rate
Floppy Drive Considerations
Floppy Interface Configuration
Floppy Interface Connector (J14)
IDE Hard Disk Interface
IDE Connector (J12)
Page
IDE Interface Configuration
Compact Flash Solid-State Disk
Enabling the Drive
Master/Slave Setting
Solid-State Disk Preparation
Flat Panel/CRT Video Controller
Name Connector Pins/Type Description
Connecting a CRT (J5)
J5 Pin Signal Name DB-15 DB-9
Part Description Mating Connector
Connecting a Flat Panel (J3)
W10 +5V +3.3V
Figure 28. LCD Power Selector Configuration (W10)
Name Description
Part Description Mating Connector
Power Sequencing
Advanced Power Management
BIOS Support of Non-Standard Panels
LCD Bias Supply Option
J4 Pin J3 Pin Description
W1
Figure 29. Vee Polarity Selection Jumper
Selecting Vee Polarity
Selects Negative Vee Selects Positive Vee
Attaching an External Contrast Control
=-
Figure 210. External Contrast Adjustment for LCD Panels
=--
Ra Rb Ground J3-47
External Contrast Control
Example:
Ethernet Network Interface
Network Terms
Installing an Ethernet Boot PROM
Installing a Boot PROM
Installing a Boot PROM in Byte-Wide Socket S0
Twisted Pair Interface (J7)
J7 Pin Function
Twisted-Pair Installations
Using Network Operating Systems (NOS)
Network OS Drivers
Program Name Vendor Function Driver Name
Controlling the Ethernet LAN Interface Directly
Manufacturers Ethernet ID
Byte-Wide Socket (S0)
SSD Device Type Size Package
Pins Generic
Part Number
Addressing the Byte-wide Socket
Window Address
ROM-BIOS Extensions
Performance Issues
Solid State Disk (SSD) Drives
Accessing the Byte-Wide Socket
Device Size 64KB
Segments Segment Address
(Upper Nibble of BH)
Jumpering the Byte-Wide Socket
EPROM
Byte-Wide Socket Signals
W14 Pin Signal Name Description
Using EPROMs
Flash EPROM
FLASH EPROM Programming
Using SRAMs
SRAM
Non-volatile RAM
Utility Connector (J16)
Pin Signal Name Function
PC Speaker
LED Connection
Push Button Reset Connection
Keyboard Connections
J16 Pin Signal Name DIN Pin
Battery-Backed Clock
Watchdog Timer
Figure 211. Watchdog Timer Response Jumper (W4)
Jumper W4 SETUP WDT Response
Selects -IOCHK Selects RESET W4
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AT Expansion Bus
Onboard MiniModule Expansion
Figure 212. Stacking PC/104 Modules with the Little Board/486e CPU
Using Standard PC and AT Bus Cards
Bus Expansion Guidelines
For cables up to 6 inches, use a high quality standard cable, such as 3M 3365/64 (64 conductor)
For cables between 6 and 12 inches long, use a high quality ground plane cable, such as 3M part
Do not use cables over 12 inches long.
Bus Termination
Expansion Bus Connector Pinouts
266
Table 246. AT Expansion Bus Connector, A1-A32 (P1)
* PU = pull up; PD = pull down; S = resistanc e i n seri es. All v alues in ohm s.
Product Reference
267
Table 247. AT Expansion Bus Connector, B1-B32 (P1)
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Interrupt and DMA Channel Usage
Interrupt Function
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SETUP Overview
Page Menu Name Functions
SETUP Page 1Standard (CMOS/EEPROM) Setup
Figure 213. SETUP Page 1
Date and Time
Floppy Drives
Drive Parameter Setup
IDE Hard Disk Drives
Page
Video
DRAM Memory
Error Halt
System POST
SETUP Page 2Options/Peripheral Configuration
Figure 214. SETUP Page 2
Extended BIOS
Serial Port
Port Address
Parallel Port
Selection I/O Address Interrupt
Floppy Interface Enable
Selection I/O Address IRQ DMA
IDE Interface Enable
Selection I/O Address Interrupt
Hot Key Setup Enable
Video State
Blank Post Test
Byte-Wide Socket Configuration
Size Address
Serial Boot Loader Enable
Watchdog Timer Configuration
Local Bus Video Display
Flat Panel Display Type
Installing a Modified BIOS to Support a New Panel
SETUP Page 3Serial Console Configuration
Figure 215. SETUP Page 3
Page
The SETUP.COM Program
Creating Configuration Files with SETUP.COM
Switch Function
Operation with DOS
Utility Software Overview
Technical Specifications
Page
Mode Display Mode Colors Text Font Pixels Clock
(KHz) Vert
(MHz) Horiz
(Hz)
CRT Support for Standard Video Modes
34
Table 32. Supported CRT Video ModesExtended Resolution Mode Display Mode Colors VESA
(KHz) Vert
(MHz) Horiz
Mode Font Pixels Clock
Technical Specifications
35
Table 32. Supported CRT Video ModesExtended Resolution (cont.) Mode Display Mode Colors VESA
(KHz) Vert
(MHz) Horiz
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Figure 31. Mechanical Dimensions
38
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Index
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1
A
B
F
G
H
I
J
Q
R
S
T
U