VLSI Design Course 2000

CAD ToolsCAD ToolsMagic/IRSIM/SPICEMagic/IRSIM/SPICE 簡介簡介

Presenter ：黃世緯 助教Rm 322

10/18/2000

VLSI Design Course 2000

OutlineOutline

• Introduction

• Magic – Layout Editor

• IRSIM – Logic-level simulator for MOS circuits

• SPICE – Transistor-level simulator for MOS circuits

VLSI Design Course 2000

IntroductionIntroduction

Design Circuits Circuit-levelSimulator

SPICE

Layout ToolsMagic

Logic-levelSimulator

IRSIM

extract

verification

A

B

C

C=A?B=A?

VLSI Design Course 2000

Magic – Layout EditorMagic – Layout Editor

VLSI Design Course 2000

What is Magic?What is Magic?

• A color painting tool?– Quite a bit about the nature of VLSI circuit

layout

• Additional operations– Built-in Design-Rule-Check (DRC)– Built-in Hierarchical circuit extractor– Some useful functions such as routing

tools

VLSI Design Course 2000

How to Get Help?How to Get Help?

• Manual– Hard copies– Electronic files

• postscript files available on http://video.ee.ntu.edu.tw/~vlsi_design/homework/cad_tools/magic.htm

• On WS: – ~d8921030/magic_tutorial (tutorial files)– ~d8921030/magic_tutcells (example files for tutorial)

• On-line help– >> :help subject

VLSI Design Course 2000

Running MagicRunning Magic

• 在 Linux 中的 magic 及 irsim, 均需要將 CAD_HOME 環境變數設到 /home/cad 目錄下 , 也就是 , 如果用的是 C Shell (csh, tcsh), 要加入下列兩行到 $HOME/.cshrc 中

setenv CAD_HOME /home/cad

set path=($path $CAD_HOME/bin) • 在 Linux 中執行

>> magic –dX11 –T tsmc0p8_spdm filename

VLSI Design Course 2000

The Box & the CursorThe Box & the Cursor

• Used to select things on the color display

Mouse left button

Mouse right button

VLSI Design Course 2000

Invoking CommandsInvoking Commands

• Invoking Commands– Type “:”(colon) or “;”(semi-colon) to invoke

command– Use macro

• E.g. ‘u’ means “:undo”

VLSI Design Course 2000

Magic Commands (1)Magic Commands (1)

• Basic Painting– :paint layers (color)– :erase layers

• “ ^D ” (erase all layers underneath the cursor)

– Use Mouse• Select or box what U would like to paint• Move to the color (layer) U would like to paint• Press middle button (or press left & right

together if U use 2-button mouse)

VLSI Design Course 2000

Magic Commands (2)Magic Commands (2)

• If I mistake to take action…– :undo

• Same as ‘u’

– :redo• Same as ‘U’

VLSI Design Course 2000

Magic Commands (3)Magic Commands (3)

• Selection– Move over the portion and type ‘s’– Select more

• Type ‘S’

– Select area ‘a’ / select more area ‘A’– Clear out the selection

• ‘C’ or “:select clear”

VLSI Design Course 2000

Magic Commands (4)Magic Commands (4)

• Operations on the Selection– :delete d– :move q(l), w(d), e(u), r(r)– :stretch Q, W, E, R– :copy c– :upsidedown (vertically flip)– :sideway (horizontally flip)– :clockwise

VLSI Design Course 2000

Magic Commands (5)Magic Commands (5)

• Label– :label– Erase a label

• Select it and delete it

– Erase all labels• :erase labels

– Labeling conventions• Vdd! GND! (important!!)

VLSI Design Course 2000

Magic Commands (6)Magic Commands (6)

• Save to files– :writeall– :save name

• Magic file format : *.mag

• Leaving Magic– :quit

VLSI Design Course 2000

Magic Commands (7)Magic Commands (7)• Utility Commands

– :grid [spacing]– :zoom z / Z (zoom in/out)

• Advanced Wiring– :array xsize ysize

• Cell Hierarchy– Expanding

• x (expand)• X (overview)

• Design Rule Checking– :drc why– :drc find

VLSI Design Course 2000

IRSIM – Logic-level simulator for IRSIM – Logic-level simulator for MOS circuitsMOS circuits

VLSI Design Course 2000

Function of IRSIMFunction of IRSIM

• Logic-level simulation (based on RC model)• Display simulation waveform• Differences from SPICE

– IRSIM is an event-driven logic-level simulator for MOS transistor circuits.

– SPICE is a circuit analysis tool for simulation of electrical circuits in steady-state, transient, and frequency domains.

VLSI Design Course 2000

IRSIM EXAMPLEIRSIM EXAMPLE

#1 Download magic file (ex or4.mag) and extract as .ext file.:load or4:extract#2 Convert .ext file to .sim file.ccsun> ext2sim or4.sim or4.ext#3 Construct command file for IRSIM.ccsun> vim or4.cmd

VLSI Design Course 2000

COMMAND FILE EXAMPLECOMMAND FILE EXAMPLE

h Vdd!l GND!vector INPUT a b c dclock Vdd! 1 1 1 1 1 1 1 1V INPUT 0000 0001 0010 0011 0100 0101 0110 0111R 1clock Vdd! 1 1 1 1 1 1 1 1V INPUT 1000 1001 1010 1011 1100 1101 1110 1111R 1ana a b c d z

此行去掉，改加在 run irsim 之後，見下頁

VLSI Design Course 2000

TRY IRSIMTRY IRSIM

#4 Try this .cmd file with IRSIMccsun> irsim tsmc08.prm or4.sim -or4.cmd#5 run analyze windowirsim> ana a b c d z#6 Analyzer window with simulation results will pop up.

VLSI Design Course 2000

ANALYZE WINDOWANALYZE WINDOW

VLSI Design Course 2000

SPICE – Transistor-level simulator SPICE – Transistor-level simulator for MOS circuitsfor MOS circuits

VLSI Design Course 2000

Magic to SpiceMagic to Spice

• Convert magic extracted files to spice net files ext2spice name.sp name.ext

VLSI Design Course 2000

SPICESPICE

*~~~~ .lib 'tsmc08.model' TT.op.option post captab.global vdd vss

VLSI Design Course 2000

SPICE CircuitSPICE Circuit

Vout

Vdd

Vss

Vin

1

0

5

211

VLSI Design Course 2000

SPICESPICE

** Circuit Description **Vin 1 0 DC +1.5VVDD vdd 0 DC +1.5VVSS vss 0 DC 0VM1 2 1 5 5 PCH L=1um W=1umM2 2 1 0 0 NCH L=1um W=1um* drain gate source substrate

VLSI Design Course 2000

SPICESPICE

** Analysis Requests **.DC Vin 0 1.5 5mV

** Output Requests **.plot DC V(2).probe.end