bphinz / netlist-graph

Java library for parsing and manipulating graph representations of gate-level Verilog netlists

NetlistGraph

This is a Java library for parsing and returning graph representations of gate-level Verilog netlists. It's being developed primarily as a backbone for Xprova but can also be used to jump start the development of any EDA tool that involves gate-level processing of Verilog netlists.

Cookbook Examples

To load a Verilog netlist, first prepare and load a component library. This is just a Verilog file that contains skeleton module definitions with module names, ports and port directions such as:

module DFF(clk, reset, d, q);
	input clk, reset, d;
	output q;
endmodule

module AND(a, b, y);
	input a, b;
	output y;
endmodule

module NOT(a, y);
	input a;
	output y;
endmodule

The following call loads the content of the file above (call it simple.lib):

ArrayList<Netlist> libModules = VerilogParser.parseFile('./simple.lib', new GateLibrary());

Each of DFF, AND and NOT are loaded as individual Netlist objects and can now be used to prepare a GateLibrary object using:

GateLibrary simpleLib = new GateLibrary(libModules);

After initializing simpleLib you can load any gate-level Verilog netlist consisting of the libray modules such as:

module main(clk, rst, x, y);

	input clk, rst, x;

	output y;

	NOT inv1(x, y);

endmodule

which can be loaded using:

ArrayList<Netlist> netListArr = VerilogParser.parseFile('minimal.v', simpleLib);