CSE370 PAL Tutorial - Using Active-HDL to Compile to PALs
Programmable Array Logic: Specification, Compilation, and Programming
tutorial will familiarize you with the process of mapping logic to a PAL and
programming the PAL so that is ready to include on your protoboard along with
other circuitry. In the following, a Verilog file describing a counter is
used as an example. However, you'll use a Verilog file of your own to
specify the logic to implemented in the PAL. After completing this
tutorial you will know how to:
- Specify that a PAL is to be
used to implement a block in your design;
- Instruct the tool as to the
particular PAL to which the logic will be mapped;
- Run the compilation process
and read the resulting reports about how the mapping proceeded including
how to read the pin map for the part; and
- Program the PAL so that it
is ready to be used on your protoboard.
though this tutorial will show you all you need to know to create basic PALs,
you should experiment with Active-HDL on your own. You will find that there are
many tools and options that have been left out of this tutorial for the sake of
simplicity. By experimenting with these tools on your own, you will become more
proficient with Active-HDL, and you may find different methods that better suit
your style, while still achieving the same design goals.
- Open Active-HDL.
- Select the “Open
existing workspace” option and
select your workspace from the previous
lab in the window, or click the “More…” button to attach
and open it.
- Click OK.
* If you have forgotten how to use the
“More…” button refer back to Tutorial #1 for directions.
Using a PAL in a Design
<![if !supportLists]>4. <![endif]>Go
back to your Verilog design for the full-adder circuit of the Tutorial 3.
<![if !supportLists]>5. <![endif]>In
the tools menu select “Preferences”. There are a few steps to
follow to tell ActiveHDL what type of programmable array logic you are going to
- Select “Flows”
from the Category list on the left. In the “Select Flow” drop
down menu select “Multivendor Flow” then click OK.
- In the Design menu, select
- In the Flow Configuration
Settings window locate the HDL Synthesis section. Change the Tool Name
drop down to “Cypress Synthesis & Implementation”.
In the Defaults section change the Family drop down to “Cypress
SPLD.” Click OK.
- Open the design flow by
clicking on the Design Flow icon in the tool bar.
- In the Design Flow page to
the left of the “Synthesis & Implementation” icon you will
see an options button. Click the options button (Highlighted orange in
- Ensure that the Top Level
Unit drop down has your Verilog file in it. If not, change it to match the
file you want programmed in the PAL. Note: For a file to be listed in the
Top Level Unit drop down box it must already be compiled. Change the
Device drop down box to “c22v10” and the Package drop down to
“PALCE22V10L-25PC”. Click OK when finished.
- When you are ready to
generate the files to program your PAL click on the “Synthesis &
Implementation” icon (shown in figure below) on the Design Flow
page. This will cause a file of type *.jed to be generated that can be
used to program your PAL. NOTE: Only click on the synthesis &
implementation button once. You will need the log file for the next step
to determine the pin configuration. If aldec starts a second
synthesis it will clear the log files. When performing a new
synthesis, aldec clears the log files in preparation for the new synthesis
but then does NOT perform a new synthesis because the old synthesis is
up-to-date. This leaves you with a blank log file. If this happens and
your log file is blank, change something in your Verilog file, save it,
recompile it, then synthesis it. This will cause aldec to perform a new
synthesis and generate a new log since the source file changed causing the
files to be out-of-date.
- After the synthesis
completes click the reports button that is located to the left of the
Synthesis & Implementation button. (Highlighted orange in Figure
- You should look at this
report carefully and make sure you understand all its parts. Double
click on the report for your Verilog module and scroll down until you find
the diagram the displays the location of the pins. The diagram should like
the figure below. NOTE: Pin 12 is GND and Pin 24 is Vcc even though
they say not used. You might want to save this part of the log for
future reference when you use your PAL on your protoboard. Note that
the pins are assigned by the tool. In a later tutorial, we'll learn
how to specify where each input and output should be assigned.
- Goto the special PAL
programming station in the lab and logon as the appropriate user that
contains your .jed file on its network share.
- Place your 22V10 PAL chip
in the programmer. First lift the release lever so that it is pointing
straight up. The TOP of the chip (end with notch) should be away from the
lever(see diagram on right of programmer). Place the chip in the
programmer so that the chip is as close to the lever as possible. This
means that all the extra space for pins
should be left towards the top of the programmer. DO NOT force the chip
in. Make sure to properly align the pins. The bottom of the
chip should be near the bottom of the programmer which is next to the
lever. Your chip should fit in the red box shown in the diagram below.
After placing the chip in the programmer close the lever.
- From the programs menu go to
BK PRECISION and open the program BK4uw. After BK PRECISION opens and
finds the programmer, verify the programmer is working by looking on the
“programmer” box in the bottom of the window under status(red
circle in Figure 12) it should say “ready,” if it
doesn’t contact the course staff. IMPORTANT:
Verify the programmer is setup for your PAL by looking at the
“Device” window located at the bottom of the screen(red arrow
in Figure 12) and making sure the program lists “Cypress
PALCE22V10” as the Device. If the Cypress PALCE22V10 is listed
SKIP step #4 and go to step #7. If another device is listed go to step #4.
- To setup the programmer to
select your PAL go to the “Device” menu and click on
“Select Device.” In the Select Device window (shown in figure
below) type “Cypress PALCE22V10” in the Search field. There
are several Cypress PALs, make
sure you select “Cypress PALCE22V10.” Click OK when finished.
The PAL should now show up in the Device window at the bottom of the
screen should now look similar to the figure above.
- Next you will need to setup
the options you will be able to perform on this chip. Select the menu
option “Operation options,” which is located under the
“Device” menu and the “Device options” sub menu.
- In the Device Operation
Options window make sure the “Device” checkbox has a check in
it. Click OK.
- Select Load from the File
menu and navigate to your .jed file and click open.
- Click the Erase Button on
the toolbar to erase the PAL
- Click the Program button on
the toolbar to load your .jed file onto the PAL.
- A window will appear asking
for confirmation. Make sure the Device box has a check mar. If the check
mark is present click YES. If a check mark does not appear, click no and
go to step 5.
- After the device finishes
programming a window will come up and ask if you want to repeat this
action. Click on the no button
- Congratulations you have
programmed your PAL. Remember to Exit BK PRECISION, remove the PAL from
the programmer, and log out of the computer for the next person.
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