mirror of https://github.com/YosysHQ/icestorm.git
a5427d704a
Resolves #328 Summary: - By default emit Verilog-2001 style module declarations with direction and signal type defined in the module prototype and not in the body of the module - Add -C option to output Verilog-1995 module declarations for compatibility with older toolchains - Add some comments to the file to assist future maintainers Background: Currently, icebox_vlog outputs a mixed-style module declaration in which it puts the port direction in the module prototype and later declares the signals as ports or wires. ```verilog module chip (input pin1, output pin2); wire pin1; reg pin2 = 0; ``` The inclusion of the direction in the module prototype is a feature of newer Verilog-2001 specification. It seems probable that older versions of Icarus Verilog had some leeway in handling this mixed-style of declaration. But, it seems that at least the version included in newer Ubuntu distributions considers this to be a syntax error. In this commit, the module declaration above will be emitted as: ```verilog module chip (input wire pin1, output reg pin2 = 0); ``` Or if you sepcificy the -C option for Verilog-1995 compatibility: ```verilog module chip (pin1, pin2); input pin1; output pin2; wire pin1; reg pin2 = 0; ``` |
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| docs | ||
| examples | ||
| icebox | ||
| icebram | ||
| icecompr | ||
| icefuzz | ||
| icemulti | ||
| icepack | ||
| icepll | ||
| iceprog | ||
| icetime | ||
| .gitignore | ||
| COPYING | ||
| CodeOfConduct | ||
| Makefile | ||
| README | ||
| config.mk | ||
README
Project IceStorm aims at documenting the bitstream format of Lattice iCE40 FPGAs and providing simple tools for analyzing and creating bitstream files. See http://bygone.clairexen.net/icestorm/ for more information. Most of Project IceStorm is licensed under the ISC license: # Permission to use, copy, modify, and/or distribute this software for any # purpose with or without fee is hereby granted, provided that the above # copyright notice and this permission notice appear in all copies. # # THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR # ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES # WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN # ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF # OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.