Microprocessor and Computer Architecture · Unit 10
Computer Architecture Paradigms and 8085 Features
Exam-focused notes for Computer Architecture Paradigms and 8085 Features (Microprocessor and Computer Architecture, BIT151): what the TU syllabus asks and how it has actually been tested, with 10 solved past questions from this unit.
What this unit covers
- RISC and CISC architecture comparison
- Flynns classification of computers
- Flags in 8085 microprocessor
- Flag types and functions
- Multiplexed address bus
- Combinational circuit design for arithmetic operations
RISC and CISC architecture comparison
Differentiate between RISC and CISC Architecture and Booth's Multiplication
- Multiply 9 × 7 using Booth's Algorithm - Multiplicand $M = 9$ - Multiplier $Q = 7$ - Both positive, need signed 2's complement representation Bit-width check: $9 = 10012$ (4 bits). To represent as signed positive, we need a leading 0, so minimum 5 bits: $...
Full solved answer →Differentiate between RISC and CISC architecture. Represent $(88_{10})$ in signed magnitude, 1's complement and 2's complement format. [5+5]
--- Feature RISC CISC --------- Instruction Set Small, simple, fixed-length Large, complex, variable-length Execution Time Mostly single clock cycle Multiple clock cycles Addressing Modes Few (3-5) Many (10-20+) Memory Access Only LOAD/STORE access memory M...
Full solved answer →Write short notes on: a) RISC b) Page Fault. [5]
RISC is a CPU design philosophy that uses a small, highly optimized set of instructions that can be executed in a single clock cycle. - Simple Instructions: Each instruction performs a simple, basic operation - Fixed Instruction Length: All instructions are...
Full solved answer →Differentiate between RISC and CISC computer. [5]
--- Feature RISC (Reduced Instruction Set Computer) CISC (Complex Instruction Set Computer) --------- Instruction Set Small, simple, and limited set of instructions Large, complex set of instructions Instruction Size Fixed size (uniform length) Variable siz...
Full solved answer →Flag types and functions
Explain all the flags in 8085 microprocessor. [5]
The 8085 microprocessor contains a special 8-bit register called the Flag Register (also called Program Status Word). It contains 5 flags that reflect the status of the result after arithmetic and logical operations. --- - Set to 1 if the result of an opera...
Full solved answer →Combinational circuit design for arithmetic operations
Design a 4-bit combinational circuit decrementer (A1 ←\gets← A1 - 1) using four full-adder circuits. Explain the circuit. [5]
A decrementer reduces the input value by 1, i.e., it computes: $$A - 1 = A + (-1)$$ In 2's complement, the value -1 is represented as 1111 (for 4 bits). Therefore, subtracting 1 from A is equivalent to adding 1111 (all 1s) to A using binary addition. --- We...
Full solved answer →Multiplexed address bus
Write short notes on: a.) Multiplexed Address Write short notes on: b.) Memory Hierarchy [2.5+2.5]
Definition: A multiplexed address is a technique where the same set of address lines (pins) is used to transmit different parts of an address at different times, rather than having separate lines for each part. Key Concept: In many memory systems (especiall...
Full solved answer →Flags in 8085 microprocessor
What is flag? What are different flags available in 8085 microprocessor? [5]
A flag is a single-bit flip-flop (register) that reflects the status (condition) of the result after the execution of an arithmetic or logical operation. Flags are part of the Program Status Word (PSW) or Flag Register in the 8085 microprocessor. The 8085 h...
Full solved answer →What is flag? What are different flags available in 8085 microprocessor? [5]
A flag is a single-bit flip-flop (register) that reflects the status or condition of the result after an arithmetic or logical operation performed by the ALU (Arithmetic and Logic Unit). Flags are stored in a special 8-bit register called the Flag Register ...
Full solved answer →Flynns classification of computers
Write short notes on(Among three only attempt two): a.) Flynn's Classification Write short notes on: b.) Memory protection Write short notes on: c.) Memory mapped I/O [2.5+2.5+2.5]
--- Flynn's Classification (1966) categorizes computer architectures based on the number of instruction streams and data streams that can be processed simultaneously. Class Full Name Description ------------------------------- SISD Single Instruction, Singl...
Full solved answer →Make Unit 10 stick
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