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62 lines
2.1 KiB
Markdown
62 lines
2.1 KiB
Markdown
Synthesis for RISC-V Microprocessor System-on-Chip Design
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This subdirectory contains synthesis scripts for use with Synopsys
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(snps) Design Compiler (DC). Synthesis commands are found in
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scripts/synth.tcl.
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Example Usage
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make synth DESIGN=wallypipelinedcore FREQ=500 CONFIG=rv32e
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environment variables
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DESIGN
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Design provides the name of the output log. Default is synth.
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FREQ
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Frequency in MHz. Default is 500
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CONFIG
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The Wally configuration file. The default is rv32e.
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Examples: rv32e, rv64gc, rv32gc
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TECH
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The target standard cell library. The default is sky130.
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sky90: skywater 90nm TT 25C
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sky130: skywater 130nm TT 25C
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SAIFPOWER
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Controls if power analysis is driven by switching factor or
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RTL modelsim simulation. When enabled requires a saif file
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named power.saif. The default is 0.
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0: switching factor power analysis
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1: RTL simulation driven power analysis.
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-----
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Extra Tool (PPA)
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To run ppa analysis that hones into target frequency, you can type:
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python3 ppa/ppaSynth.py from the synthDC directory. This runs a sweep
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across all modules listed at the bottom of the ppaSynth.py file.
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Two options for running the sweep. The first run runs all modules for
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all techs around a given frequency (i.e., freqs). The second option
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will run all designs for the specific module based on bestSynths.csv
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values. Since the second option is 2nd, it has priority. If the
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second set of values is commented out, it will run all widths.
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WARNING: The first option may runs lots of runs that could expend all
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the licenses available for a license. Therefore, care must be taken
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to be sure that enough licenses are available for this first option.
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##### Run specific syntheses
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widths = [8, 16, 32, 64, 128]
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modules = ['mul', 'adder', 'shifter', 'flop', 'comparator', 'binencoder', 'csa', 'mux2', 'mux4', 'mux8']
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techs = ['sky90', 'sky130', 'tsmc28', 'tsmc28psyn']
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freqs = [5000]
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synthsToRun = allCombos(widths, modules, techs, freqs)
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##### Run a sweep based on best delay found in existing syntheses
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module = 'adder'
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width = 32
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tech = 'tsmc28psyn'
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synthsToRun = freqSweep(module, width, tech) |