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???
02/11/07 20:42
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 		 #132556 - here's the code again
Responding to: ???'s previous message
Ok, several posts above. It is also below as well.


My code is as follows:

jmp main

main:
mov TCON,5h
mov dptr,0
mov IE,85h
sjmp $

In the "INT0" interrupt:

mov A,P1
movx @dptr,A
inc dptr
iret

In the "INT1" interrupt:
mov dptr,0
iret


6 bits is the total number of address bits I need.

As I have mentioned before, I want to make a ROM using logic gates, that way, it is already hardcoded, and I don't have to reprogram it.

The actual data codes are 8 bits in length. One 8051 command requires all 8 bytes fed to the data line.

So basically, I'm taking the 6 address lines (A0 to A5) as logic inputs, and each data bit represents a output.

so if I were to convert my code for the first bit that the computer generated into an algebraic expression, it would be something like this:

Bit 0: FD'C'BA + FE'D'BA + FED'C'A' + F'EDC'A' + F'ECBA


So lets take this equation. What is the easiest way to simplify this so that I use the fewest number of logic gates?

No, this is not homework. I'm doing this for myself.

List of 99 messages in thread
TopicAuthorDate
new plan. RE: 8051 SBC/PGMR            01/01/70 00:00      
   Make a front panel            01/01/70 00:00      
      clock needed.            01/01/70 00:00      
         in \"the bible\" there is a discussion of the \"once            01/01/70 00:00      
            think about this            01/01/70 00:00      
               That's how early MCU's were prototyped            01/01/70 00:00      
   FPGA software            01/01/70 00:00      
      Maybe not just yet ...            01/01/70 00:00      
         Logic minimisation            01/01/70 00:00      
      hmm...            01/01/70 00:00      
         Complicate things?            01/01/70 00:00      
            I have guts ;-)            01/01/70 00:00      
               guts?... maybe, but what about brains?            01/01/70 00:00      
         development            01/01/70 00:00      
            what i mean is...            01/01/70 00:00      
               Where's the directory? Where's the FCB, and FAT?            01/01/70 00:00      
         Reality vs perception            01/01/70 00:00      
   Back to basics, ... not BASIC!            01/01/70 00:00      
      .            01/01/70 00:00      
         comments            01/01/70 00:00      
            Erik ... you've struck a nerve ...            01/01/70 00:00      
               if you, just for once, would take the time to read            01/01/70 00:00      
                  So ... where's the help for him in that example?            01/01/70 00:00      
                     right there            01/01/70 00:00      
                        Front panel            01/01/70 00:00      
                     But...            01/01/70 00:00      
               Nerves            01/01/70 00:00      
                  You're right about that ...            01/01/70 00:00      
                     BINGO!            01/01/70 00:00      
                        So why not use a PROM?            01/01/70 00:00      
            did you visit here before?            01/01/70 00:00      
               ISP is not special!            01/01/70 00:00      
         Simple            01/01/70 00:00      
         Why not using an ISP-micro?            01/01/70 00:00      
   Why dismiss rom?            01/01/70 00:00      
      .            01/01/70 00:00      
         Yes, but, still, why dismiss ROM?            01/01/70 00:00      
   Sooooooooooooooooooooooooooooooooooooo complicated            01/01/70 00:00      
      That's an understatement ...            01/01/70 00:00      
         Aren't you doing an Erik now?            01/01/70 00:00      
            It's because I'm confused ...            01/01/70 00:00      
      no            01/01/70 00:00      
         but you said you already have a programmer            01/01/70 00:00      
   KISS, and one step at a time            01/01/70 00:00      
      KISS: alreay been said.            01/01/70 00:00      
   plan vs No_idea            01/01/70 00:00      
   Mike ... It looks as though you want ...            01/01/70 00:00      
      .            01/01/70 00:00      
         It looks as though you have some thinking to do.            01/01/70 00:00      
         Yes, a lot of thinking to do!            01/01/70 00:00      
            why do you worry about that?            01/01/70 00:00      
               Mark this on your calendar! ... Erik and I agree!            01/01/70 00:00      
   Mike - Time to fess up...            01/01/70 00:00      
      I kind of agree            01/01/70 00:00      
   not guts but folly            01/01/70 00:00      
   RE: Free Chips            01/01/70 00:00      
   I give up seeking help here            01/01/70 00:00      
      Because what you plan to do is just idiotic!            01/01/70 00:00      
      good plan!            01/01/70 00:00      
         Bootloader project gone bad            01/01/70 00:00      
            ...            01/01/70 00:00      
               Instead of the mishmash you propose, how about one            01/01/70 00:00      
                  Homework            01/01/70 00:00      
                     if it is, then whoever assigned it is crazier tha            01/01/70 00:00      
                        IT IS NOT HOMEWORK            01/01/70 00:00      
                           really?            01/01/70 00:00      
               16 bytes? Are you sure?            01/01/70 00:00      
      He who laughs last...            01/01/70 00:00      
         let me reword my question one step at a time            01/01/70 00:00      
            Guts            01/01/70 00:00      
            I don't get it Mike            01/01/70 00:00      
               here's the code again            01/01/70 00:00      
                  Mike please read good plan post            01/01/70 00:00      
                  Try to go back to reality, Mike ...            01/01/70 00:00      
                     It looks like he is trying to do minimisation            01/01/70 00:00      
      Sorry know one can help            01/01/70 00:00      
         blatant errors in syntax            01/01/70 00:00      
            Come on, Richard...            01/01/70 00:00      
      The CrazyROM            01/01/70 00:00      
         Agreed            01/01/70 00:00      
         CrazyRom(tm)            01/01/70 00:00      
            It is already taken...            01/01/70 00:00      
               Mike Stegmaier, I found the solution            01/01/70 00:00      
         Blast from the past            01/01/70 00:00      
         welcome back Michael Karas, we missed you            01/01/70 00:00      
            ade7756 interface with 89c51 urgent code needed            01/01/70 00:00      
               Why post that in THIS thread?            01/01/70 00:00      
               Not only is it entirely irrelevant to this thread            01/01/70 00:00      
         Thanks All            01/01/70 00:00      
            Warm welcome, Michael!            01/01/70 00:00      
            Cross-post            01/01/70 00:00      
            Link            01/01/70 00:00      
            Micheal Karas            01/01/70 00:00      
               that ois why there is 'stuff' around the            01/01/70 00:00      
   History lesson            01/01/70 00:00      
      ROM Reliability            01/01/70 00:00      
         high failure rate            01/01/70 00:00      
            Out of Market. Hmmm            01/01/70 00:00      
               Not SLOW, but slower ...            01/01/70 00:00      

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