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Diffstat (limited to 'README.md')
| -rw-r--r-- | README.md | 19 |
1 files changed, 14 insertions, 5 deletions
@@ -66,25 +66,26 @@ prerequisites for building yosys: $ sudo apt-get install build-essential clang bison flex \ libreadline-dev gawk tcl-dev libffi-dev git \ - graphviz xdot pkg-config python3 + graphviz xdot pkg-config python3 libboost-system-dev \ + libboost-python-dev libboost-filesystem-dev Similarily, on Mac OS X MacPorts or Homebrew can be used to install dependencies: $ brew tap Homebrew/bundle && brew bundle $ sudo port install bison flex readline gawk libffi \ - git graphviz pkgconfig python36 + git graphviz pkgconfig python36 boost On FreeBSD use the following command to install all prerequisites: # pkg install bison flex readline gawk libffi\ - git graphviz pkgconfig python3 python36 tcl-wrapper + git graphviz pkgconfig python3 python36 tcl-wrapper boost-libs On FreeBSD system use gmake instead of make. To run tests use: % MAKE=gmake CC=cc gmake test For Cygwin use the following command to install all prerequisites, or select these additional packages: - setup-x86_64.exe -q --packages=bison,flex,gcc-core,gcc-g++,git,libffi-devel,libreadline-devel,make,pkg-config,python3,tcl-devel + setup-x86_64.exe -q --packages=bison,flex,gcc-core,gcc-g++,git,libffi-devel,libreadline-devel,make,pkg-config,python3,tcl-devel,boost-build There are also pre-compiled Yosys binary packages for Ubuntu and Win32 as well as a source distribution for Visual Studio. Visit the Yosys download page for @@ -310,12 +311,20 @@ Verilog Attributes and non-standard features that have the same ports as the real thing but do not contain information on the internal configuration. This modules are only used by the synthesis passes to identify input and output ports of cells. The Verilog backend - also does not output blackbox modules on default. + also does not output blackbox modules on default. ``read_verilog``, unless + called with ``-noblackbox`` will automatically set the blackbox attribute + on any empty module it reads. + +- The ``noblackbox`` attribute set on an empty module prevents ``read_verilog`` + from automatically setting the blackbox attribute on the module. - The ``whitebox`` attribute on modules triggers the same behavior as ``blackbox``, but is for whitebox modules, i.e. library modules that contain a behavioral model of the cell type. +- The ``lib_whitebox`` attribute overwrites ``whitebox`` when ``read_verilog`` + is run in `-lib` mode. Otherwise it's automatically removed. + - The ``dynports`` attribute is used by the Verilog front-end to mark modules that have ports with a width that depends on a parameter. |