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cellref: Deprecate cell_library.rst

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Most of the word/coarse level cells have an assigned group and individual page.
The gate/fine level cells are all on one page.
Fix links to `cell_library.rst`.
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Krystine Sherwin 2024-05-27 15:46:43 +12:00
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docs/source/using_yosys/synthesis/opt.rst
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@ -27,9 +27,9 @@ Constant folding and simple expression rewriting - `opt_expr`
.. todo:: unsure if this is too much detail and should be in :doc:`/yosys_internals/index`
This pass performs constant folding on the internal combinational cell types
described in :doc:`/yosys_internals/formats/cell_library`. This means a cell
with all constant inputs is replaced with the constant value this cell drives.
In some cases this pass can also optimize cells with some constant inputs.
described in :doc:`/cell_gate` and :doc:`/cell_word`. This means a cell with all
constant inputs is replaced with the constant value this cell drives. In some
cases this pass can also optimize cells with some constant inputs.
.. table:: Const folding rules for `$_AND_` cells as used in `opt_expr`.
:name: tab:opt_expr_and
@ -182,6 +182,8 @@ away by `opt_expr`.
Performing DFF optimizations - `opt_dff`
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.. todo:: ``$_DFF_`` isn't a valid cell
This pass identifies single-bit d-type flip-flops (`$_DFF_`, `$dff`, and `$adff`
cells) with a constant data input and replaces them with a constant driver. It
can also merge clock enables and synchronous reset multiplexers, removing unused