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Digital Multiplying Delay Locked Loop

DMDLL

Introduction

The DLL is used for many clock alignment applications, including on-chip clock generation, high speed serial I/O links, and clock recovery circuits in communication systems. This clock alignment function can be provided by either phase-locked loops (PLL) or delay-locked loops (DLL). Some advantages of the DLL include unconditional stability, low phase-error accumulation, low sensitivity to supply noise or substrate noise, and a fast locking time. But the traditional DLL has a major drawback in that, unlike a PLL, it is incapable of frequency multiplication.

Multiplying DLL architectures can overcome this drawback while keeping the merits of the traditional DLL. Although this digital MDLL uses more area and power than an analog MDLL, its design has better portability and scalability. We are proposing an implementation of a DLL with an operating range from 50MHz to 100MHz in 0.5 um technology.
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250Mbps Serializer/Deserializer

The use of serializer/deserializers (SERDES) allows digital data buses to be transmitted over single data lines with embedded clock information, and then recover the data and the clock for further processing. This recovery operation is performed using a delay-locked loop (DLL). For data recovery, where clocks are often sent alongside the data, frequency synthesis is not necessary, and the added complexity of a PLL does not warrant the cost. DLL’s are often much better suited for data recovery due to their inherent stability, lower area, and simpler design constraints.

As technology continues to advance, high speed serial links will become increasingly important. With this in mind, we propose to implement a SERDES which is capable of both transmitting and receiving serial data at a maximum bit rate of 250Mbps. It is also important to consider the method by which data will be transmitted over long data links. Impedance matches will be done off-chip, and differential current-mode drivers have been designed and implemented on chip in the interest of noise immunity and simplicity

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Smart Processor

16 – Bit 2 Stage Pipelined MIPS Microprocessor

implemented a simplified 16-bit, 2 stage pipelined MIPS RISC Microprocessor. We have 16 instructions and 16 general purpose registers, with register 0 always 0. Register file is 2 port read and one port write. Same pins are used for memory in/out with multiplexing done by mem_write_enable_s1. Processor is timed using 2 phase non overlapped clocking scheme. Microprocessor directly communicates only with external memory

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VHDL/VERILOG MODEL OF A research1451.2

In this projectaper, research 1451 Standards are considered. Nowadays, some vendors supply smart sensors adherent to research1451.2, the standard part that describes Smart Transducer Interface Module (STIM), Transducer Electronic DataSheet (TEDS), and Transducer Independent Interface (TII). Generally, these sensors have a microprocessor-centered architecture, where the CPU is devoted both to handle sensing element signal and to support research1451.2 structure .However, it is said that few commercial products (e.g., Telemonitor TMI931A) are currently supporting research1451.2 because of its relatively high cost; actually vendors prefer research1451.4 , a simpler and cheaper standard solution. It is suitable for analog transducers (e.g., ENDEVCO i-TEDS accelerometers), since it defines only TEDS and requires a small number of additional components. In order to obtain a fast and more compact system, the systemon-chip (SoC) approach can be pursued; C (microcontroller), conditioning electronics, and even sensors can be integrated in one chip, reducing overall cost and simplifying assembly procedures .

New sensors are required to be small, cheap, and smart. This project deals with intelligent sensors embedded in a single chip: a Verilog/VHDL model of an research1451.2 Smart Sensor is proposed to obtain a portable STIM block suitable for customizable compact solutions and allowing low-cost, large-scale production. In order to evaluate performances of the proposed model, working prototypes have been built and some tests have been carried out in a real case (chemical detection sensors). The proposed Verilog/VHDL model has been compared with traditional, software-based, microcontroller solutions showing that a timing performance improvement greater than 50% can be obtained. Finally, to exemplify effectiveness of a portable VHDL model, a single-chip sensor with USB interface and integrated research1451 structures has been realized and experimentally characterized.

Project 1, Inverter
Project 2, XNOR Gates
Project 3, Comparitor
Project 4, Incrementer, Counter
Project 5, Digital to PWM Analog Converter

VHDL Examples

HDL (Hardware Description Language) based design has established itself as the modern approach to design of digital systems, with VHDL (VHSIC Hardware Description Language) and Verilog HDL being the two dominant HDLs.

examples have been simulated by Aldec ActiveHDL Simulator and Synopsys Design Analyzer, as well as synthesized with Synopsys Design Compiler . Several sequential design examples have been successfully tested on Xilinx Foundation Software and FPGA/CPLD board.

Driver 

 Behavior Code

Behavior Simulation

 Inverter 

 Behavior Code

Behavior Simulation

gate

 Behavior Code

Behavior Simulation

 NOR gate 

 Behavior Code

Behavior Simulation

AND gate

Behavior Code

Behavior Simulation

NAND gate

Behavior Code

Behavior Simulation

 XOR gate

 Behavior Code

Behavior Simulation

 XNOR gate

 Behavior Code

Behavior Simulation

VLSI project ideas

LDPC Coder/Decoder

On-Chip Security monitors

Physical Random Function generation with Soft Errors

Register file and SRAM

Parity prediction in adders

Multi-sampling latches

On-Chip Bus design

Low-power multiplier





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  1. Guru

    few VLSI projects
    5. Design a combinational circuit that detects an error in the representation of a decimal digit in BCD. In other
    words, obtain the logic diagram whose output is equal to 1 when the inputs contain any one of the six
    unused bit combinations in the BCD code.
    6. Complete the design of the BCD-to-seven-segment decoder by performing the following steps:
    (a) Determine the truth table for the BCD-to-seven-segment decoder.
    (b) Plot the seven maps and come up with reduced SOP equations for the seven outputs.
    (c) Write a complete verilog module for the decoder, using one “assign” statement per output.
    7. Complete the design of a 4 input priority encoder by performing the following steps:
    (a) Determine the truth table where input D0 is the highest priority input. Outputs are A1, A0 and V (valid).
    (b) Plot the three maps and come up with reduced SOP equations for the three outputs.
    (c) Write a complete verilog module for the encoder, using one “assign” statement per output.

  2. raghav

    Very large-scale integration (VLSI) refers to an IC or technology with many devices on one chip. The question, of course, is how one defines “many.”
    The term originated in the 1970s along with “SSI” (small-scale integration), “LSI” (large-scale), and several others, defined by the number of transistors or gates per IC. It was all a bit silly since improving technology obviously makes numerical definitions meaningless over time. And it varies by industry — a VLSI analog part is quite different from a VLSI digital logic part or a VLSI memory part.

    Eventually, the pundits began trying terms like “ULSI” (ultra-large-scale). Engineers, meanwhile, ignored it all and spent their time building better devices instead of making up new words for them.
    what is vlsi
    The terms LSI and VLSI are now usually used as general terms, referring to a product or technology that subjectively has more devices than typical products in the category. Maxim has observed a technical trend in analog and mixed signal toward increasing complexity. Many of our parts include complex control, such as the MAXQ microcontroller core, with many times more devices than most analog parts.






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