Massachusetts Institute of TechnologyDepartment of Electrical Engineering and Computer Science6.111 – Introductory Digital Systems LaboratoryPAL ProgrammingLast revised January 23, 2004IntroductionWe will not deal here with the details of the HDL (Verilog or VHDL) coding used togenerate the logic embedded in the PAL, but assume that you have properly coded what youwant the PAL to do. Compile the code using GALAXY which is accessed on the ProjectAthena Sun systems by:setup 6.111galaxy &GALAXY is also available on the lab computers.It is necessary to open a project (either ‘open’ or ‘new’ and select the HDL files you willbe incorporating into your design. Use “smart” compile. When your file compiles with noerrors, select the appropriate part (‘device’), set the appropriate top file and then compileagain. You should have two files that are pertinent here: one is the ‘.rpt’ file which willdisclose pin numbers on your PAL. The other is the ‘.jed’ of JEDEC file which you will useto program your PAL.Use the commandsadd mcopymcopy -t a: <filename>.jedto copy a jedec file to a floppy disk.The -t does the translation between DOS and UNIX line-endings.The PAL programmer is a ‘universal programmer’ made by Hi-Lo Systems and it is lo-cated on the ‘dome side’ of the lab, near the window. The program you will use to ‘burn’the jedec file into your part is called WACCESS. Unfortunately, this program only runs underWindows 95. There is an icon for it on the screen of the computer.Make sure the programmer is turned on.1. Start WACCESS by double clicking the icon.2. Select the device you are using, first by manufacturer and then by part number. Notethat there are many devices and many manufacturers. Note also that this thing canprogram many different types of devices: make sure that it is displaying lists of PLD’s(programmable logic devices).6.111 — PAL Programming 23. Load your jedec file from the floppy.4. Program: you will get a pulldown box that, by default, both programs and verifies.Leave both options on.If all is well the programmer will tell you that it was successful.The program can do other things: it can verify that what is in a device is what is intendedby a jedec file. It can erase a part. It can verify that a part is erased.If you have selected the wrong part number, the program will complain. If you havefailed to turn on the power to the programmer, the program will complain with a strangeerror message. If you have failed to insert a part to be programmed, the program will
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