Adex ISAIX16 User Manual - Page 9

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ISAIX16 User's Manual

BOARD INITIALIZATION

Bus Isolation Extender isolates power and bus signals between

the add-on board and the motherboard. Each time the toggle

switch is turned off, the power to the add-on board is lost.

Therefore, the information in the registers and memory on the

add-on board will also be lost. For the next add-on boards to be

tested again, the add-on board will need to be reinitialized, after

the powers are reconnected.

initialization routine to restore the information back to the add-on

board, before running the test. It can be done in a batch file

where the initialization routine is placed before the test routine.

The initialization routine can search for a previous saved

configuration file and use it to reinitialize the add-on board. The

test software should display the test results and messages to tell

the operator when to remove and add another board for test, and

how to restart the test.

Every time the Bus Isolation Extender is power up or down, the

on-board logic will resynchronize itself to disconnect or reconnect

properly. A reset signal will also be generated to the add-on

board under test during reconnection. In automated system, the

initialization software should allow approximately 20 ms delay

after the extender is turned on, before attempt to reinitialized the

board. In manual toggle switch operation, the user should wait

until the red LED is blinking before reinitialization. In software

control operation, the LED- signal could be sensed externally at

logic low state at least twice contiguously by the software to

confirm the bus is reconnected, before reinitialization. During

disconnect, the user should wait for the red LED to stop blinking

before removing the add-on board under test. In software control

operation, the LED- should be sensed high at least twice

contiguously before putting out messages to remove the board.

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Adex Electronics

User will need to develop an

ISAIX16 User's Manual

MOUNTING OF BUS ISOLATION EXTENDER

The Bus Isolation Extender incorporates very fast CMOS buffers

for isolation of bus signals between the add-on board and the

motherboard. These CMOS buffers are extremely sensitive to

voltage spikes and can be easily damaged by Electrostatic

Discharge (ESD) or any sparking due to intermittent contacts. It

is necessary for users in production environment to mount the

Bus Isolation Extender firmly against a common platform where

the motherboard is mounted. For in chassis testing, a fixture or a

bracket should be developed to hold the Bus Isolation Extender

to the chassis. For out of chassis environment, user should tie the

motherboard and the Bus Isolation Extender down against a

common platform.

Whatever the fixture or bracket design is

used, one should not allow the Bus Isolation Extender to be lifted

with the add-on board nor to wiggle side to side.

An inexpensive and simple bracket has been designed by Adex

Electronics for in chassis use and they can be ordered with part

number ISABK1. The bracket design, however is free to user as

reference.

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Adex Electronics