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DEM-DAI1604

DEMONSTRATION SOFTWARE

Software is provided with the DEM-DAI1604 to allow

programming of the PCM1600’s internal registers. The soft-

ware will operate on computers running Microsoft Windows

3.1, 95 or 98. The demo software requires that the PC printer

port be connected to CN3 of the DEM-DAI1604 using a

standard printer cable.

Installation

The demo software is distributed on a 3.5 inch floppy disk.

On the disk, there is a single folder named “Dem1604.”

This folder contains the application and all support files.

To install the software on your computer, first create a new

folder on your hard drive with an appropriate name (e.g.,

DEM1604, PCM1604, etc.). Then open the “Dem1604”

folder on the installation floppy and copy all the files in it to

your new folder.

Open the configuration settings file named “Dem1604” with

a text editor, such as Notepad. When the file is opened, find

the following line:

PCMIFADR = &h378

The &h378 indicates the printer port address that the demo

software will use to communicate with the DEM-DAI1604.

This address must be set to &h378, &h278, or &h3BC. Most

PCs use &H378 as the default printer port address. If your

printer port is not located at &h378, edit the address to match

your computer’s port address.

Using the Demo Software

Double click on the application file named “Dem1604.”

A window will appear on your screen, as shown in Figure 5.

There are two menus near the top of the window, named

Execute and Window.

The Execute menu includes three selections: Initialize, Re-

set, and Exit. Selecting Initialize will instruct the program to

write all of the PCM1604’s internal registers with the default

values. Selecting Reset will instruct the program to rewrite

the PCM1604’s internal registers with the data currently

selected in the application windows. Selecting Exit will

close the application.

The Window menu includes four selections: Attenuation,

Operational Control, Function Control, and Register Read.

The following sections provide an explanation of each

window.

HOLD and PASS

Each window has a button near the top. It’s labeled either

HOLD or PASS. The current setting is toggled by clicking on

the button. When set to HOLD, the settings in a window can

be changed, but they will not be written to the register(s) until

the OK button (which appears at the bottom of the window)

is pressed. When set to PASS, setting changes made in a

window are immediately written to the corresponding

register(s).

Attenuation Window

The Attenuation window is used to set the digital attenuation

registers internal to the PCM1604 and is shown in Figure 6.

There is an attenuator for each of the six output channels,

and each attenuator has its own independent register to

control its attenuation level. In the Attenuation window,

there is a slider for each attenuator register. Use the slider

handle or the arrows at each end of the slider to adjust the

attenuation level. The left and right arrow keys on the

keyboard can also be used to adjust the level. To the right of

each slider is a status display showing the current register

setting (in decimal) and the corresponding attenuation level

in decibels (dB) relative to the input signal level.

FIGURE 5. Start Up Window.

FIGURE 6. Attenuation Window.