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+This directory contains a quick setup of the helloworld example for
+the GHDL simulator.
+Compiled by Arnim Laeuger, 17-Apr-2008.
+Removed ROC/unisim dependency 16-Jun-2008.
+Compiling the example
+Make all shell scripts executable:
+ $ chmod +x *.sh
+On Linux, convert files from DOS format:
+ $ dos2unix *.sh
+You need to import the project sources once by running
+ $ ./ghdl_import.sh
+Compilation (using GHDL's make feature) is invoked by
+ $ ./ghdl_make.sh
+Whenever the VHDL sources change, it's enough to execute ghdl_make.sh. GHDL
+will trace the dependencies and will rebuild only the modified sources.
+Simulation finally happens by running the fpga_top executable generated by the
+compilation step. Don't forget to set a stop time or the testbench might run
+ $ ./fpga_top --stop-time=2100us
+The log.txt and trace.txt files are generated as simulation progresses. They
+should be compared to the files given in the example directory.
+Waveforms can be obtained by specifying the ghw file name:
+ $ ./fpga_top --stop-time=1ms --wave=zpu.ghw
+They can be inspected with gtkwave from http://home.nc.rr.com/gtkwave/.