VHDL Building
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The document discusses the use of the GHDL compiler and simulator for VHDL design, highlighting its speed, cross-platform compatibility, and open-source nature. It provides instructions on how to use GHDL, including examples of commands for analyzing and simulating VHDL files, as well as creating a Makefile for build automation. Additionally, it outlines the structure of a Makefile with examples for compiling and running test benches.
VHDL Building
- 2. Common VHDL Design Flow
- 4. GHDL Compiler and Simulator
- 5. Then Why Use GHDL? ● speed (it is not an interpreter) ● runs on Windows, Linux and even on macOS ● target platform independent (Xilinx, Altera, Lattice) ● easy start with manual building ● decent documentation ● it is open-source software (see this GitHub repository)
- 6. How To Use GDHL? ● it is terminal-based program ● very similar to gcc in terms of use ● it has multiple back-ends, such as mcode, gcc and LLVM ● -a option ● analyzes/compiles one or more files ● creates object files as a result ● -e option ● elaborates an unit (must be already analyzed) ● creates an executable file (usable for test benches)
- 7. Example of Using GHDL ● we need to follow the order of GHDL commands ● simulate clk_divider module with associated clk_divider_tb 1.ghdl -a --std=93 clk_divider.vhdl 2.ghdl -a --std=93 clk_divider_tb.vhdl 3.ghdl -e --std=93 clk_divider_tb 4.ghdl -r --std=93 clk_divider_tb or ./clk_divider_tb
- 8. Makefile ● a file used for make build automation ● it can be used literally for any software to build ● it can be invoked by make command in the directory containing the makefile or Makefile file ● basically it contains a set of rules with the following form: target: dependencies system command(s) ● when used only make command, it will start from the first stated target ● to choose the entry target, use make target command
- 9. Example of a Makefile (1) clk_divider_tb: clk_divider_tb.o ghdl -e --std=93 clk_divider_tb clk_divider_tb.o: clk_divider_tb.vhdl clk_divider.o ghdl -a --std=93 clk_divider_tb.vhdl clk_divider.o: clk_divider.vhdl ghdl -a --std=93 clk_divider.vhdl
- 10. Example of a Makefile (2) .PHONY: run clean run: clk_divider_tb ghdl -r --std=93 @< clean: rm -f clk_divider_tb rm -f *.o rm -f *.cf
- 11. Questions? Dominik Salvet I do not own copyright to images.