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Aleks-Daniel Jakimenko-Aleksejev 2016-11-19 20:51:50 +02:00
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@ -165,8 +165,8 @@ The following very basic synthesis script should work well with all designs:
techmap; opt
If ABC is enabled in the Yosys build configuration and a cell library is given
in the liberty file ``mycells.lib``, the following synthesis script will synthesize
for the given cell library:
in the liberty file ``mycells.lib``, the following synthesis script will
synthesize for the given cell library:
# the high-level stuff
hierarchy; proc; fsm; opt; memory; opt
@ -192,8 +192,9 @@ cell libraries can be found here:
- http://www.vlsitechnology.org/html/libraries.html
- http://www.vlsitechnology.org/synopsys/vsclib013.lib
The command ``synth`` provides a good default synthesis script (see ``help synth``).
If possible a synthesis script should borrow from ``synth``. For example:
The command ``synth`` provides a good default synthesis script (see
``help synth``). If possible a synthesis script should borrow from ``synth``.
For example:
# the high-level stuff
hierarchy
@ -284,8 +285,8 @@ Verilog Attributes and non-standard features
command from flattening the indicated cells and modules.
- The ``init`` attribute on wires is set by the frontend when a register is
initialized "FPGA-style" with ``reg foo = val``. It can be used during synthesis
to add the necessary reset logic.
initialized "FPGA-style" with ``reg foo = val``. It can be used during
synthesis to add the necessary reset logic.
- The ``top`` attribute on a module marks this module as the top of the
design hierarchy. The ``hierarchy`` command sets this attribute when called
@ -382,8 +383,8 @@ Non-standard or SystemVerilog features for formal verification
- The system task ``$anyseq`` evaluates to any value, possibly a different
value in each cycle.
- The SystemVerilog tasks ``$past``, ``$stable``, ``$rose`` and ``$fell`` are supported
in any clocked block.
- The SystemVerilog tasks ``$past``, ``$stable``, ``$rose`` and ``$fell`` are
supported in any clocked block.
- The syntax ``@($global_clock)`` can be used to create FFs that have no
explicit clock input ($ff cells).
@ -402,8 +403,8 @@ from SystemVerilog:
- The ``assume`` and ``restrict`` statements from SystemVerilog are also
supported. The same limitations as with the ``assert`` statement apply.
- The keywords ``always_comb``, ``always_ff`` and ``always_latch``, ``logic`` and
``bit`` are supported.
- The keywords ``always_comb``, ``always_ff`` and ``always_latch``, ``logic``
and ``bit`` are supported.
- SystemVerilog packages are supported. Once a SystemVerilog file is read
into a design with ``read_verilog``, all its packages are available to