IC TESTER part-2

All other parts are still the same as the original software. The menu (10.531 Bytes) a little different, I omitted the choice for "Test chip once (slow and fast)" and replace it with "Debugging test" for testing the new created IC library and "Run test IC" for normally test. Also "Test Chip Repeatedly until Failure" was omitted, because I thought that this routine was not very useful.
How the comparing algorithm works? It works like this :



  • After an IC library file has loaded (or created), every inputs send to the IC pin socket, while the outputs are keep high. After the stable condition arised, the IC output under test will change byt itself, in accordance by the device itself (the kind of gate). And then the logic of IC pin socket read back again, and the outputs are compared to the boolean thruth table from IC library file (so the IC library must exactly meet the data book thruth table).



  • If the IC has clock, then the clocks are sending  pulse (1 high and 1 low) depends on the clock is a rising edge signal or a falling edge signal (+Clock or -Clock). and then the outputs are read back and compared to the IC librarary file. If the logic outputs are the same as the data, so the IC device passed, on the other way the device failed. That's all.




  • Original editor still have many bugs, I have improved the editor layout (10.603 Bytes) and keys, so it is convenience to use.


    HARDWARE TESTING

                Because this project needs more attention when assembly, I already made a program to test it after you have finished (hw_test.exe). Here you  must prepare a voltage tester or if it could be a logic probe. I used a self made logic probe and it seems a good one from ETI-Project (If I have time, I will write it later). After everything is okay, test the circuit by applying the voltage to it. Watch out something goes wrong. If nothing happened and the circuit seems work normally, connect it to LPT port. Run the software for testing the hardware. The menu (7.590 Bytes) are for testing the PPI-8255, logic write to pins socket, logic read from pins socket, IC pin power selectable, and overall connection (7.233 Bytes). Run from the first to the last one by one. Every step you will be prompted to check the proper pin hardware connection. If the result not the same, stop the process and examine carefully where the step stopped at. After you fixed it, run again from the beginning. Good luck!!!




    NEW IC DEVICE FILE FORMAT

                IC library file format still the same from the original, but I added some for IC compatibility type and IC description and copyright for appreciate of his works. The extension is also *.CHP. Both software still can used the file format each other. ChipTest.exe can used new format and ignore the feature parts, but if edited with it will lost the feature. IcTester.exe can still used old format but without the feature parts, if edited with it will added the feature. The complete file format are like below:
     
    *** CHIP TESTER DEVICE FILE
    #
    #
    *** PIN COUNT
    Constant_PC_1                 ;IC pin Q'ty
    Constant_PC_2                 ;Input pin Q'ty
    Constant_PC_3                 ;Output pin Q'ty
    Constant_PC_4                 ;Clock(+) pin Q'ty
    Constant_PC_5                 ;Clock(-) pin Q'ty
    Constant_PC_6                 ;Edited pin Q'ty
    *** PIN TYPES
    Constant_PT_1                 ;Pin 1
    Constant_PT_2                 ;Pin 2
        .                         ;Pin 3 through IC pin Q'ty
        .                         ;Pin types are : 1 = input, 2 = Output,
        .                         ;3 = Clock(+), 4 = Clock(-),
        .                         ;5 = Vcc, 6 = Gnd, 7 = Unused
    Constant_PT_(Constant_PC_1)   ;Last IC pin
    *** TEST DATA
    Constant_TD_0                 ;Step check (Max. 255 step)
    Constant_TD_11 Constant_TD_12 ... Constant_TD_1(Constant_PC_6)        ;Matrix for Boolean Truth Table
    Constant_TD_21 Constant_TD_22 ... Constant_TD_2(Constant_PC_6)
        .
        .
        .
    Constant_TD_(Constant_TD_0)1 Constant_TD_(Constant_TD_0)2 Constant_TD_(Constant_TD_0)(Constant_PC_6)
    *** END                       ;Compatibility for Paul Stenning IC Data File Format
    *** IC COMPATIBLE TYPES
    String_CT_1                   ;Reserved for 7 name
    String_CT_2                   ;Max. 8 characters
        .
        .
        .
    String_CT_7
    *** DESCRIPTION
    String_D                      ;Max. 60 characters
    *** COPYRIGHT
    Originated by: Paul Stenning (1993)
    Modified by: David Setya Atmaja (1999)
     
    Sample of this file format for old version type 7400 IC TTL and new version like this.
                As mention from his page, all digital type IC can be checked accept that those incorporating analog techniques, such as monostables and phase locked loops. Both TTL's or CMOS's types were accepted. All IC's that have its boolean thruth table can be implemented here. You can create your own library database (because mine was not complete yet) by inputed this boolean thruth table from data books and experiment with it. This is what we call, "Hope you having fun with electronics !!!!!".Now you can download my second version of libraries database (72.996 Bytes)


    PART LISTS

                The components for building this paralel version of IC-Tester are :
       1. Resistors :
          R1 ~ R24 = 220 Ohm ...................................................... 24 pcs
          R25 ~ R49 = 4k7 ......................................................... 25 pcs
       2. Capasitors :
          C1 ~ C3 = 100 nF (for IC decoupling, used as necessary ) ................ 3 pcs
          C4 = 470 uF/16V (for power input) ....................................... 1 pcs
       3. Semiconductors :
          IC1  = PPI-8255A-5 or equivalent type (Parallel Peripheral Interface) ... 1 pcs
          IC2 = 74LS138 (3 to 8 channel decoder) .................................. 1 pcs
          IC3 ~ IC5 = 74LS374 (Octal latch) ....................................... 3 pcs
          IC6 ~ IC9, IC14 = 74LS07 (Hex buffer) ................................... 5 pcs
          IC10 ~ IC12 = 74LS244 (Octal tri-state bus driver) ...................... 3 pcs
          IC13 = 74LS04(Hex Inverter) ............................

    2 comments:

    1. i think this content is more benefit to the visitors , please comment your Queries about this post. "Thank You"

      ReplyDelete
    2. greetings
      The diagram of the pcb has a major flaw, 5v only goes to the relays not to the main part of the board.
      A track or link has been left out.

      H J Quinn
      hjquinn@bigpond.net.au

      ReplyDelete

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