Figure 3-2, Oops! jumper connection, Table 3-21 – ADLINK LittleBoard 735 User Manual

Page 46: Smbus pin signals (j45), Smbus interface, Oops! jumper (bios recovery), Remote access

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Chapter 3

Hardware

40

Reference Manual

LittleBoard 735

Note: The shaded table cells denote power or ground.

SMBus Interface

Compatible with most I2C devices, this interface allows the processor to communicate with SMBus slave
peripherals through the Host SMBus controller on the ICH7-M.

Table 3-21

lists the pin signals for the SMBus interface (J45), which provides a 5-pin, single-row header

with 0.49" pitch.

Note: The shaded table cells denote power or ground.

Oops! Jumper (BIOS Recovery)

The Oops! jumper is provided in the event the BIOS settings you have 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 the
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

.

Figure 3-2. Oops! Jumper Connection

Remote Access

The LittleBoard 735 supports the remote access (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.

8

GPO2

User defined

9

GPI3

User defined

10

GPO3

User defined

Table 3-21. SMBus Pin Signals (J45)

Pin #

Signal

Description

1

SCL

SMBus Clock Reset

2

GND

Ground

3

SDA

SMBus Data Reset

4

VCC

+3.3 Volts DC +/ 5%

5

ALERT

SMBus Alert

Table 3-20. User GPIO Pin Signals (J40) (Continued)

Serial A Interface (J11)

for Serial Port 1

(or COM1 Port)

1

2

3

4

5

6

7

8

9

10

20

19

Top View

Standard DB9 Serial

Port Connector (Male)

Front View

Or

LB735Oopsjumper_b

5

4

3

2

1

9

8

7

6

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