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How to Use Synopsys Design Compiler 185 for RTL Synthesis
Synopsys Design Compiler 185 is a powerful tool for synthesizing register-transfer level (RTL) designs into gate-level netlists. It is part of Synopsys' comprehensive RTL synthesis solution, which also includes Power Compiler, DesignWare, PrimeTime, and DFTMAX. In this article, we will show you how to use Synopsys Design Compiler 185 for RTL synthesis with some basic steps and tips.
Step 1: Set Up the Environment
Before you start using Synopsys Design Compiler 185, you need to set up the environment variables and source files. You can use the following commands in a terminal:
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setenv SYNOPSYS /path/to/synopsys/installation
setenv DC_HOME $SYNOPSYS/dc
setenv PATH $DC_HOME/bin:$PATH
setenv LM_LICENSE_FILE $SYNOPSYS/license.dat
source $DC_HOME/setup.csh
You also need to create a working directory and copy your RTL files and library files into it. For example:
mkdir work
cd work
cp /path/to/rtl/files/*.v .
cp /path/to/library/files/*.db .
Step 2: Launch Synopsys Design Compiler 185
You can launch Synopsys Design Compiler 185 in two modes: graphical user interface (GUI) mode or command-line interface (CLI) mode. To launch it in GUI mode, you can use the command:
dc_shell -gui
To launch it in CLI mode, you can use the command:
dc_shell
In both modes, you will see a prompt like this:
dc_shell>
You can type commands or scripts at the prompt to perform various tasks.
Step 3: Read the RTL Files
The first task you need to do is to read your RTL files into Synopsys Design Compiler 185. You can use the analyze command to read Verilog files, or the read_hdl command to read VHDL files. For example:
analyze -format verilog *.v
read_hdl -vhdl93 *.vhd
You can also use the -library option to specify which library to use for each file. For example:
analyze -format verilog -library work *.v
read_hdl -vhdl93 -library work *.vhd
You can use the link command to link all the files together into a single design. For example:
link
You can use the current_design command to set or check the current design name. For example:
current_design top
current_design
Step 4: Set Up the Constraints
The next task you need to do is to set up the constraints for your design. Constraints are specifications that define the performance, area, power, and timing requirements of your design. You can use the set_max_delay, set_min_delay, set_max_area, set_max_power, and set_max_fanout commands to set various constraints. For example:
set_max_delay -from [all_inputs] -to [all_outputs] 10
set_min_delay -from [all_inputs] -to [all_outputs] 1
set_max_area 100000
set_max_power 50
set_max_fanout 10
You can also use the create_clock, create_generated_clock, and set_clock_uncertainty commands to define clock sources, clock domains, 29c81ba772
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