Lfsr hspice manual pdf

For more details on hspice input file format, please refer to the. The starhspice optimizing analog circuit simulator is a industrialgrade circuit analysis product for the simulation of electrical circuits in steadystate, transient, and frequency domains. This guide describes how to use hspice to simulate and analyze your circuit designs. In computing, a linearfeedback shift register lfsr is a shift register whose input bit is a linear function of its previous state. A hspice simulation and analysis user guide, x2005. Audience this manual is intended for design engineers who use starhspice to develop, test, analyze, and modify circuit designs. See the custom compiler simulation and analysis environment user guide. Cs 355 fall 2005 lecture 10 2 linear feedback shift register lfsr example.

Introduction spice simulation program with integrated circuit emphasis is a widelyused circuit simulation program. Linear feedback shift register taps table 1 lists the appropriate taps for maximumlength lfsr counters of up to 168 bits. Hspice simulation and analysis user guide version y2006. Introduction the objective of this tutorial is to provide an introduction to the hspice simulation environment. The most commonly used linear function of single bits is exclusiveor xor. Constantcurrent threshold voltage extraction in hspice.

For descriptions of the other manuals in the hspice documentation set, see the next section, the. Capacitance model see capacitance model in the starhspice manual. Chapter 11, using hspice with hspice rf describes how various analysis features differ in hspice rf as compared to standard hspice. Starhspice quick reference guide 35 if a capacitor model exists using the same name as a parameter for capval, the model name is taken to avoid syntactic conflicts. Stanford cnfet model hspice stanford nanoelectronics lab. Pdf fpga implementation of 8, 16 and 32 bit lfsr with maximum. It was developed as public domain software at the university of california and versions 2g6 vanilla spice and 3. One clb is used to implement the 2input xnor function, the first register of the 52 bit lfsr, all three srl16 blocks, the bit 50. You can start starhspice in either a prompting mode or a nonprompting command line mode. With over 25 years of successful design tapeouts, hspice is the industrys most trusted and comprehensive circuit simulator. Brief introduction to hspice simulation wojciech giziewicz 1 introduction this document is based on one written by ihsan djomehri, spring 1999. For detailed descriptions of all other types of models summarized in this manual, see the hspice elements and device models manual.

Ddl use ddl access hspice circuit simulation automatically looks for a. M multiplier used to simulate multiple parallel capacitors. Before running hspice, users should execute the command source usrclassee dot. Chapter 7, library encryption describes the synopsys library encryptor and how to use it to protect your intellectual property. The star hspice builtin functions are listed in star hspice builtin functions. For more specific details and examples refer to the relevant manual. Thus, an lfsr is most often a shift register whose input bit is. Building an lfsr from a primitive polynomial for kbit lfsr number the flipflops with ff1 on the right. No part of this manual may be reproduced in any form or by any means. The bit numbering starts from n1 with n being the input bit and 1 the output bit. The feedback path comes from the q output of the leftmost ff.

An lfsr generates periodic sequence must start in a nonzero state, the maximumlength of an lfsr sequence is 2n1 does not generate all 0s pattern gets stuck in that state the characteristic polynomial of an lfsr generating a maximumlength sequence is a primitive polynomial a maximumlength sequence is pseudorandom. Xilinx xapp210 linear feedback shift registers in virtex. It is assumed that the user has a working knowledge of the hspice tool. Design of reconfigurable lfsr for vlsi ic testing in asic. The x0 1 term corresponds to connecting the feedback directly to the d input of ff 1. The procedure for opening an xwindow varies depending on the type of computer you are using. Audience this manual is intended for design engineers who use starhspice to develop, test, analyze, and. Linear feedback shift register pseudorandom pattern generation linear feedback shift registers make extremely good pseudorandom pattern generators.

Originally developed at berkeley in the late 60s and early 70s, spice has evolved into one of the tools of choice for circuit simulation. Related documents the following documents pertain to. The qucs simulator and spice tool is used to perform compilation of fast multiple. For further assistance the students are encouraged to contact the lab tutors during the lab sessions or via email. A brief introduction on hspice siavash kananian sharif university of technology electronics iii 9282011 electronics iii fall 2011. Devika and others published design of reconfigurable lfsr for vlsi ic testing in asic and fpga find, read and cite all the research you need on researchgate. You could find some example source files in this tutorial latter. This manual describes how to use hspice to maintain signal integrity in your chip design. Hspice device models quick reference guide version w2005. Also the simulation problem for long bit lfsr on fpga is presented. The taps for the 118bit lfsr are 85 and 118 and are taken from table 1. Simd single instruction multiple data stream 1006100710081009, systolic arrays.

A 118bit lfsr implementation using two clbs is shown in figure 3. Spice reads in a list of circuit nodes and the elements between. Use the following procedure to start starhspice in the prompting mode. Thus, an lfsr is most often a shift register whose input bit is driven by the xor of some bits of the overall shift register value. Be sure that a complete set of parameters is entered in the correct sequence before. Although spice comes in many flavors you think thats a bad pun, keep reading, we strongly. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. Hspice simulation and analysis user guide version x2005. The synopsys hspice circuit simulator, version 2002. Table of linear feedback shift registers roy ward, tim molteno october 26, 2007 here is a table of maximumcycle linear feedback shift register lfsr taps. Hspice is the industrys gold standard for accurate circuit simulation and offers foundrycertified mos device models with stateoftheart simulation and analysis algorithms. We can characterize the lfsrs that produce pnsequences. Syntax notation the meaning of a parameter may depend on its location in the statement. Starting with, the output stream is 1001 1010 1111 000.

Fort collins, colorado, usa 80528 2globalfoundries, inc. A sequence produced by a length n lfsr which has period 2n1 is called a pnsequence or a pseudonoise sequence. Tran tiner tstop startstval where tiner is the timestep, tstop is the final time value and stval is the. We define the characteristic polynomial of an lfsr as the polynomial, f x c0 c1x c2x 2. Inside this manual this manual contains the chapters described below. Hsice simulation guide penn state school of electrical. Constantcurrent threshold voltage extraction in hspice for nanoscale cmos analog design alvin l. Hspice manual for the use of hspice syntax in the source file you could find some example source files in thisfile. Audience this manual is intended for design engineers who use star hspice to develop, test, analyze, and modify circuit designs. If you have questions, read the section on workstation basics later in this handout.