Can someone please help me with Q25 b.) ii.) (1 Viewer)

[hscc]

https://www.boardofstudies.nsw.edu.au/hsc_exams/hsc2006exams/pdf_doc/software_design_dev_06.pdf

Hi, can someone please help me with Q25 b.) ii.) of the 2006 SDD paper, I don't know how to draw circuits from truth tables, however I do know how to draw truth tables from circuits. Can someone please teach me the former, thanks.

 

[Nailgun]

https://www.boardofstudies.nsw.edu.au/hsc_exams/hsc2006exams/pdf_doc/software_design_dev_06.pdf

Hi, can someone please help me with Q25 b.) ii.) of the 2006 SDD paper, I don't know how to draw circuits from truth tables, however I do know how to draw truth tables from circuits. Can someone please teach me the former, thanks.

25 bii is a circuit drawing

here is a link where i learned how to do it in like 30 seconds lol
http://www.tutorialspoint.com/computer_logical_organization/logic_gates.htm

 

[KingOfActing]

What you usually want to do first is make a table of what you want to do, then use Sum of Products or Product of sums (I prefer the former). However in this case, they've explicitly mentioned what they want:



Drawing:

 

[hscc]

What you usually want to do first is make a table of what you want to do, then use Sum of Products or Product of sums (I prefer the former). However in this case, they've explicitly mentioned what they want:



Drawing:

View attachment 33084

Thanks King! But, shouldn't it be A(B+C)?

 

[KingOfActing]

Thanks King! But, shouldn't it be A(B+C)?

I took "either or" to mean either A or B, but not both. That's A XOR B. I assume that if they meant the inclusive or, they would've just said "A or B".

 

[hscc]

I took "either or" to mean either A or B, but not both. That's A XOR B. I assume that if they meant the inclusive or, they would've just said "A or B".

Ah cheers! That makes sense. I can finally draw these now. By the way, do you have any recommended resources for learning how to do algorithm questions (pseudocode) (in the planning/designing topic) and learning flip flops. I don't understand flip flops at all! Thanks

 

[KingOfActing]

Ah cheers! That makes sense. I can finally draw these now. By the way, do you have any recommended resources for learning how to do algorithm questions (pseudocode) (in the planning/designing topic) and learning flip flops. I don't understand flip flops at all! Thanks

Aha, algorithms is actually my strongest point. Try thinking up algorithms for yourself, and actually coding them in a real language (Java, for example). As for flip flops... I just bullshit them completely in the exams, just talk about registers and latches

 

[hscc]

Aha, algorithms is actually my strongest point. Try thinking up algorithms for yourself, and actually coding them in a real language (Java, for example). As for flip flops... I just bullshit them completely in the exams, just talk about registers and latches

Haha! Thanks! Algorithms are my weakest points. I just can't answer any of those questions where it gives you a situation and then asks to write an algorithm in pseudocode. And also algorithms for swaps/arrays and just everything in planning/designing. But I'm good with other topics. As for the option topic, flip-flops just don't make any sense, apart from definitions. If I get asked to draw one in an exam I'm screwed!

 

[KingOfActing]

Haha! Thanks! Algorithms are my weakest points. I just can't answer any of those questions where it gives you a situation and then asks to write an algorithm in pseudocode. And also algorithms for swaps/arrays and just everything in planning/designing. But I'm good with other topics. As for the option topic, flip-flops just don't make any sense, apart from definitions. If I get asked to draw one in an exam I'm screwed!

Let's both pray we don't get asked to then