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Auto Detect Function for Digital 74 series IC tester

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doremifaso

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Hi!

I am doing a fyp on fpga based digital ic tester for 74 series TTL IC chips. I am using VHDL code and Altera DE2 board (Cyclone 2) for my project.

May I know how to perform auto detect function on 74 series IC chips? or may i know what is the algorithm for the auto detect function? For example, when I put 7400 chip on the 40pin ZIF, the Cyclone 2 will detect the unknown chip as 7400 chip and perform functional test on it.

Thanks!
 

I don't think any 74 series IC's will go into a 40-pin ZIF socket. And there are so many different logic functions in the series, I don't think the algorithm will be able to tell which is being tested. I'd use a UART and terminal program to set up the testing logic.
 

Hi!

Thanks for reply.

I decide to use 16 pin ZIF socket for my 74 series IC. Thanks for remind.

May I know how you use UART and terminal program to set up? Because I am using Expansion Header from the DE2 board to perform testing logic.
 

I'd say look for a turtorial on the web if you don't know how to use a UART and terminal program. You can start at the "beyond logic" website, he has some pretty good tutorials. I am using a very simple version of a uart for my board, but it only implements a one way comm channel. You can find good UART's to use at opencore.com. Also, you can probably find one in your tools you're using ( Altera megafunction plug in manager )
 

Hi!

Thanks for reply!

If use UART, I have to use RS232 right? Since my laptop don't have RS232 port, can I use the converter RS232 to USB? If can, will the data transferring speed become very slow?
 

You can use a UBS to RS232 converter. The data transfer speed should be pleanty sufficient. Store your test vectors and do all checking in the FPGA, and just use the UART for test setup and getting text of the results.
 
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