This manual describes the Verilog portion of Synopsys FPGA Compiler II / FPGA Express application, part of the Synopsys suite of synthesis tools. FPGA Compiler II / FPGA Express reads an RTL Verilog HDL model of a discrete electronic system and synthesizes this description into a gate-level netlist. FPGA Compiler II / FPGA Express supports v1.6 of the Verilog language. Deviations from the definition of the Verilog language are explicitly noted. Constructs added in versions subsequent to Verilog 1.6 might not be supported. Aspects of the Verilog language that are not supported are listed in Appendix B.