Cadence Tips & Tricks
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1 Cadence Tips & Tricks ALICIA KLINEFELTER ECE 3663, SPRING 2013
2 Outline 1. Using NXClient for Cadence 2. Cadence Setup 3. Schematic Labels 4. Exporting plots for presentations/papers/homework 5. Presenting schematics 6. Using Open Command Environment for Analysis (OCEAN) for simulation 7. Monte Carlo simulations (MCS) in FreePDK 2
3 Using NX Client from Home Schematic viewer (Virtuoso) is incredibly slow from home. Use the following NXClient settings from home to speed up your work. Under the advanced tab Select Disable DirectDraw for screen rendering Under Cache max out both dropdowns max out cache 3
4 Helpful Cadence Setup Set up Cadence in two commands Set environment variables in ~/.bashrc file to jump to Cadence run directory: export FREEPDK=/homenfs/platou/<userID>/cadence/freePDK/ Use bash script to run all setup commands Script provided on Wiki 4
5 Adding Schematic Labels Schematic labels help in many scenarios Visual complexity of design (too many wires!) Automatic names for plotted signals No /net3 voltage signals in plots Act as documentation same net 5
6 How To Add Schematic Labels 1. CREATE WIRE NAME Hotkey: L 2. ADD MULTIPLE NET NAMES (SPACE DELIMITED) Hide and then select nets to drop label names 6
7 Exporting Plots Black plot backgrounds are not ideal Plots will be difficult to see in presentations You will hemorrhage through your black ink cartridge printing out one homework Options Modify plots in Cadence Export data, plot within MATLAB/Python/Excel/etc. Screenshots are technically an option, but it s not the best practice 7
8 Modify Plots in Cadence 1. AXIS STRIPS 2. GRAPH EDIT To modify color scheme This is a visual/optional step, to get trace color correct 8
9 Modify Plots in Cadence 1. DOUBLE CLICK ON TRACES 2. FILE SAVE AS IMAGE Check box for Use white background! 9
10 Export Plot Data 1. RIGHT-CLICK ON TRACE SAVE 2. CAN EXPORT TO CSV, MATLAB FORMATS 10
11 White Background for Schematics Black schematic backgrounds are not a good idea Presentation visibility Printing many of these will be bad for ink Depending on the printer, it may not even show up Example schematic to the right is bad, but it gets worse with complicated designs From schematic viewer window: File Export Image 11
12 OCEAN for Simulations Lets you setup, simulate, and analyze circuit data Simulation programming language Good for repetitive tasks Built-in calculator Run longer analyses such as parametric analyses, Corners Analyses, and statistical analyses more effectively Run simulations from a non-graphic, remote terminal OCEAN tutorial on Wiki venividiwiki.ee.virginia.edu/mediawiki/index.php/toolscadencetutorialsbasicsimulationoceanfreepdk OCEAN documentation on server /net/plato.ee.virginia.edu/app/cadence/ic/doc/oceanref Google-ing for OCEAN help isn t helpful 12
13 Getting Example OCEAN Script Making script from scratch is annoying Use ADE to create one Within ADE: Session Save Ocean Script Exports your current simulation settings simulator( 'spectre ) design( "/net/plato.ee.virginia.edu/users/amk5vx/simulation/fo4_inverter/spectre/schematic/netlist/netlist") resultsdir( "/net/plato.ee.virginia.edu/users/amk5vx/simulation/fo4_inverter/spectre/schematic" ) modelfile( '("/net/plato.ee.virginia.edu/app/lib/freepdk45/trunk/ncsu_basekit/models/hspice/tran_models/models_nom/nmos_vtl.inc" "") '("/net/plato.ee.virginia.edu/app/lib/freepdk45/trunk/ncsu_basekit/models/hspice/tran_models/models_nom/pmos_vtl.inc" "") '("/net/plato.ee.virginia.edu/app/lib/freepdk45/trunk/ncsu_basekit/models/hspice/tran_models/models_nom/nmos_vtg.inc" "") '("/net/plato.ee.virginia.edu/app/lib/freepdk45/trunk/ncsu_basekit/models/hspice/tran_models/models_nom/pmos_vtg.inc" "") ) analysis('tran?stop "15u"?errpreset "moderate" ) desvar( "vdd" 1.2 ) save( 'v "/dut_in" "/orig_pulse" "/dut_out" "/x4_inv_out" ) save( 'i "/V0/MINUS" ) temp( 27 ) run() selectresult( 'tran ) plot(getdata("/dut_in") getdata("/orig_pulse") getdata("/dut_out") getdata("/x4_inv_out") getdata("/v0/minus") ) 13
14 Useful OCEAN Functions Looping structures foreach() while() Conditionals if() case() VDDLIST = list( ) foreach( VDD VDDLIST of = outfile("~/results/fo4_inv/output.txt" "a") desvar( "vdd" VDD ) vdd = VDD option( 'dochecklimit "no" ) ;; Length of all devices in circuit Setting variables to use in the netlist desvar( "length" 50n ) ;; Width of the n/p devices desvar( "n_width" 90n ) desvar( "p_width" 180n ) length=50n n_width=90n p_width=180n subckt INVX16TS A VDD VSS Y NMOS (Y A VSS VSS) NMOS_VTH w=16*n_width l=length PMOS (VDD A Y VDD) PMOS_VTH w=16*p_width l=length ends INVX16TS 14
15 Useful OCEAN Functions File I/O Formatting similar to C Calculator functions Same syntax Plotting of = outfile("~/results/fo4_inv/output.txt" "a") fprintf( of "VDD(V) Delay(s)\n") <RUN ANALYSIS> diff = abs((cross(v("in") vdd/2 1 "either" nil nil) - cross(v("out") vdd/2 1 "either" nil nil))) plot( diff?expr '( "diff" ) ) fprintf( of "%g %g\n", vdd, diff) close(of) 15
16 Running the Script For circuit simulations, create directory with: 1. OCEAN script 2. Stimuli file (if applicable) 3. Circuit netlist 4. Netlist footer 5. Netlist header If simulation was run in ADE, the netlist and _graphical_stimuli.scs file are located: /simulation/<design name>/spectre/schematic/netlist/ 16
17 OCEAN for Max Frequency Requires iteration, binary search Tedious to do in ADE with high granularity Pseudo-code assuming the output value is known? for {all frequencies in range} 1. Run transient simulation at frequency x 2. Check output values 3. If they are correct, circuit success! 4. Else, the circuit failed at this frequency. Fail! 5. Print to the console the last successful frequency opcode in1 in2 clk ALU out0 out1 Express this in OCEAN syntax! Start iterating lowest frequency first Check for existence before doing math: if (t1 && t2 && t3) OCEAN errors out when doing math on nil data type 17
18 OCEAN for Power Determination Many methods for computing circuit power p avg =(i avg over 1 clock period)*v Measuring current can be tricky Many transistor symbols wont let you measure current using their terminals You can put in a dummy voltage source (0V) for measurement All components found in the library analoglib Determining power across frequencies Can use Cadence calculator, but tedious for so many frequencies How can you incorporate this into your OCEAN script? measuring current 18
19 {Delay, Sensitivity} Monte Carlo Simulation Transistor properties vary from wafer to wafer Process variations (V T ) Lithography (W, L, wire width) Transistor model parameters are averages Parameters are more distributed in silicon Monte Carlo simulates circuit over range of values for device parameters {W, L, V T } 19
20 Monte Carlo Simulation ;; Now we need to define the models for the transistors ;; Here we hardcode the path to the model library ;; DEFINE THE MODEL libdir = "./freepdk.scs" ; LIBRARY PATH ;; Set parameters specific to this model library to select the right model deviceoption = "lvt" Corner = "SS" ; "TT" "FS" "FF" "SF" "SS" = THE GLOBAL CORNER CASES ;; RUN THE SIMULATION montecarlo(?numiters 10?analysisVariation 'processandmismatch?sweptparam "None"?sweptParamVals "25"?saveData t ) ;; MONTE CARLO EXPRESSION FOR MEASUREMENTS (Remember to put the monteexpr's BEFORE the monterun. ;; Or else the expression values would not get printed in the mcdata file) monteexpr( "rt" "risetime(v(\"out\"?result 'tran) 0.5n t 1.5n t 10 90)" ) monteexpr( "ft" "risetime(v(\"out\"?result 'tran) 1.5n t 2.5n t 10 90)" ) ;; START MONTE CARLO SIMULATION save( 'all ) resultsdir("mcpsf") monterun() 20
21 Provided Files and Descriptions For running Cadence using the bash script: run_cadence.sh Example OCEAN scripts: montecarlo.ocn / netlist 21
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