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It seems like you're preparing for a course on Digital Electronics & Computer Organization (BCA-204). Here's a breakdown of the units:

Unit – I: Logic Gates and Circuits

• Gates: OR, AND, NOR, NAND, XOR, XNOR
  
  

• Laws: De Morgan's Laws, Boolean Laws
  
  

• Circuit Designing Techniques:
  
  

  • SOP (Sum of Products)
    
    

  • POS (Product of Sums)
    
    

  • K-Map (Karnaugh Map)
    
    

Unit – II: Combinational Building Blocks

• Multiplexers (MUX): Selects data from multiple input lines and forwards it to a single output line.
  
  

• Decoder: Converts binary inputs into a specific output.
  
  

• Encoder: Encodes multiple inputs into fewer outputs.
  
  

• Adder/Subtractor: Arithmetic circuits to add or subtract numbers.
  
  

Unit – III: Memories

• ROMs (Read Only Memory)
  
  

• PROMs (Programmable ROM)
  
  

• EPROMs (Erasable Programmable ROM)
  
  

• RAMs (Random Access Memory)
  
  

• Hard Disk, Floppy Disk, and CD-ROM
  
  

Unit – IV: Sequential Building Blocks

• Flip-Flops: (RS, D, JK, Master-Slave, T)
  
  

• Registers & Shift Registers
  
  

• Counters
  
  

  • Synchronous and Asynchronous Design Methods
    
    

Unit – V: Memory Organization

• Basic Cell of Static & Dynamic RAM
  
  

• Building Large Memories Using Chips
  
  

• Associative Memory
  
  

• Cache Memory Organization
  
  

• Virtual Memory Organization
  
  

Referencial Books:

1. Digital Logic and Computer Design by M.M. Mano
   
   

2. Computer Architecture by M.M. Mano
   
   

3. Digital Electronics by Malvino and Leach
   
   

4. Computer Organization and Architecture by William Stallings
   
   

5. Digital Fundamentals by Floyd, L. Thomas
   
   

6. Computer Organization by Hamcher, Vranesic, and Zaky
   
   

This covers a wide range of topics, and it might be useful to go through each of these with examples, focusing on the understanding of circuit designs, logical operations, and memory structures.

If you need specific help or clarifications on any topic, feel free to ask!