SE LDCO

SE LDCO MCQs

SE LDCO PRACTICE EXAM

UNIT-1

Digital Logic families: Digital IC Characteristics; TTL: Standard TTL characteristics, Operation of TTL NAND gate; CMOS: Standard CMOS characteristics, operation of CMOS NAND gate; Comparison of TTL & CMOS. Signed Binary number representation and Arithmetic: Sign Magnitude, 1’s complement & 2’s complement representation, unsigned Binary arithmetic (addition, subtraction, multiplication, and division), subtraction using 2’s complement; IEEE Standard 754 Floating point number representations. Codes: Binary , BCD, octal , hexadecimal , Excess-3 , Gray code & their conversions Logic minimization: Representation of logic functions: logic statement, truth table, SOP form, POS form; Simplification of logical functions using K-Maps up to 4 variables. 

UNIT-2

Design using SSI chips: Code converters, Half- Adder, Full Adder, Half Subtractor, Full Subtractor, n bit Binary adder. Introduction to MSI chips: Multiplexer (IC 74153), Demultiplexer (IC 74138), Decoder (74238) Encoder (IC 74147), Binary adder (IC 7483) Design using MSI chips: BCD adder & subtractor using IC 7483, Implementation of logic functions using IC 74153 & 74138.

UNIT-3

Introduction to sequential circuits: Difference between combinational circuits and sequential circuits; Memory element-latch & Flip-Flop. Flip- Flops: Logic diagram, truth table & excitation table of SR, JK, D, T flip flops; Conversion from one FF to another , Study of flip flops with regard to asynchronous and synchronous, Preset & Clear, Master Slave configuration ; Study of 7474, 7476 flip flop ICs. Application of flip-flops: Counters- asynchronous, synchronous and modulo n counters, study of 7490 modulus n counter ICs & their applications to implement mod counters; Registers- shift register types (SISO, SIPO, PISO &PIPO)& applications

UNIT-4

Computer organization & computer architecture, organization, functions & types of computer units- CPU(typical organization ,Functions , Types), Memory ( Types & their uses in computer ), IO( types & functions) & system bus( Address, data & control , Typical control lines, Multiple-Bus Hierarchies ); Von Neumann & Harvard architecture; Instruction cycle Processor: Single bus organization of CPU; ALU( ALU signals, functions & types); Register (types & functions of user visible, control & status registers such as general purpose, address registers, data registers, flags, PC, MAR, MBR, IR)& control unit ( control signals & typical organization of hard wired & microprogrammed CU). Micro Operations (fetch, indirect, execute, interrupt) and control signals for these micro operations. Case Study : 808

UNIT-5

Instruction : elements of machine instruction ; instruction representation (Opcode& mnemonics, Assembly language elements ) ; Instruction Format & 0-1-2-3 address formats, Types of operands Addressing modes; Instruction types based on operations ( functions & examples of each); key characteristics of RISC& CISC; Interrupt: its purpose, types , classes & interrupt handling ( ISR , multiple interrupts), exceptions; instruction pipelining( operation & speed up ) Multiprocessor systems: Taxonomy of Parallel Processor Architectures, two types of MIMD clusters & SMP (organization & benefits) & multicore processor (various Alternatives & advantages 0f multicores), typical features of multicore intel core i7

UNIT-6

Memory Systems: Characteristics of Memory Systems, Memory Hierarchy, signals to connect memory to processor, memory read & write cycle, characteristics of semiconductor memory: SRAM, DRAM &ROM, Cache Memory – Principle of Locality, Organization, Mapping functions, write policies, Replacement policies, Multilevel Caches, Cache Coherence, Input / Output Systems: I/O Module, Programmed I/O, Interrupt Driven I/O, Direct Memory Access (DMA).

study material available on 2 sept 21