DEM-DAI1742 Datasheet, PDF (9/10 Pages) Burr-Brown (TI) – EVALUATION FIXTURE

DEMONSTRATION SOFTWARE
FOR THE PCM1742
Software is provided with the DEM-DAI1742 to allow
programming of the PCM1742’s internal registers. The
software will operate on computers running Microsoft Win-
dows 3.1/95/98. The demo software requires that the PC
printer port be connected to CN003 of the DEM-DAI1742
using a standard printer cable.
INSTALLATION
The demo software is distributed on a 3.5-inch floppy disk.
There is a single folder on the disk, named “Dem1742”. 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.
Dem1742, Pcm1742, etc). Then open the “Dem1742” folder
on the installation floppy and copy all of the files in it to the
new folder that you created on your hard disk.
Open the configuration settings file named “Dem1742” with
a text editor, such as Notepad or WordPad. 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-DAI1742.
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 “Dem1742”. A
window will appear on your screen, as shown in Figure 11.
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 PCM1742’s internal registers with the default
values. Selecting Reset will instruct the program to rewrite
the PCM1742’s internal registers with the data currently
selected in the application windows. Selecting Exit will
close the application.
The Window menu includes three selections: Attenuation,
Operational Control, and Function Control. 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 setting is toggled by clicking on this
button. When set to HOLD, the user can change the settings
in a window but they will not be written to the register(s)
until the OK button (which appears at the bottom left corner
of the window) is pressed. When set to PASS, changes made
within a window are immediately written to the correspond-
ing register(s).
The Attenuation Window
The Attenuation window is used to set the digital attenuation
registers internal to the PCM1742 and is shown in Figure 12.
There is an attenuator for both the left and right output
channels, and each attenuator has its own independent reg-
FIGURE 11. Startup Window.
DEM-DAI1742
SBAU034
FIGURE 12. Attenuation Window.
9