Kontron VMOD-2D Manual do Utilizador descarregar pdf (Página 33)

VMOD-2/VMOD-2D

12/15/97

Functional Description

Page 2 - 7Man. ID 03139, Rev. Index 0200

2.2.5Interrupt Vector Setting Examples

The following examples are provided to help VMOD-2 users to quickly understand when and

how to set his VMOD-2's Interrupt Vectors as appropriate to his VMOD-2/Piggyback configu-

rations needs.

2.3 External "Local" Reset Input

A new feature of the VMOD-2 is the ability to cause a "local" reset to the on-board piggybacks

from two (previously unused) pins on the front panel connector. These pins accept external

voltages between +5V min. and +48V max, across each VMOD-2.

Set jumper B20 to 1-2 if an external reset facility is not required.

The principals of the local reset input circuit are, that an opto-coupler is monitored for an

external presence of current in through pin 26 and out to ground via pin 25 of the 50-way con-

nector. If the flow of current is interrupted at any time, e.g. by disconnection of connectors,

pressing a stop button, etc., the "local" reset is activated.

This facility may be enabled by setting the three-pin B20 jumper (linking jumper pins 1-3). Oth-

erwise the VMOD-2 is delivered with this jumper set to 1-2, which is particularly important

when using the VMOD-2 to replace an existing VMOD and not wanting to modify cables.

Table 2-5: Interrupt Vector Configuration Examples

Configuration

Vector

Modes

B1 Settings

B4...B11

Settings

1). Two "inte llige nt" pigg yback s

(bot h able to gen erate inter -

rupt vectors) are fitted to the

VMOD-2 to use their own gen-

erat ed v ectors .

Use Piggy-

back Gener-

ated V ector s

Jumper B1 is

left open.

Jumpers

B4. ..B11 are no t

decoded and can

be left in any set-

ting .

2). Two "Dumb" piggyba cks

(bot h unab le to generat e

interrupt vectors) are fitted to

the VM OD-2 an d need

VMOD-2's se t vectors.

Use VMOD-2

Jumpe r set

Vect ors

B1 is to be

set to 1- 2.

Jumpers

B4...B11 are set

for appropriate

byte co ding .

3). One "intelligent" and one

"Dum b" pigg ybac k are to be

fitted to the VMOD-2 and th e

use r want s the in tellig ent pi g-

gyback to use it's on-board

"Intelligent" vector generation

in combination with "Dumb"

jumpe r coding .

Use the

"Dumb" pig -

gybac k in

uppe r loca-

tion , and fit

the "i ntelli-

gent" on e in

lower loca-

tion .

B1 is to be

set to br idge

pins 1-3 .

Jumpers

B4...B11 are set

for d esired vect or

code to be

assigned when

piggyba ck "A"

makes an IRQ.

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