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diff --git a/manual/manual.tex b/manual/manual.tex
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@@ -140,11 +140,11 @@ bookmarksopen=false%
\eject
\chapter*{Abstract}
-Most of todays digital design is done in HDL code (mostly Verilog or VHDL) and
+Most of today's digital design is done in HDL code (mostly Verilog or VHDL) and
with the help of HDL synthesis tools.
In special cases such as synthesis for coarse-grain cell libraries or when
-testing new synthesis algorithms it might be neccessary to write a custom HDL
+testing new synthesis algorithms it might be necessary to write a custom HDL
synthesis tool or add new features to an existing one. It this cases the
availability of a Free and Open Source (FOSS) synthesis tool that can be used
as basis for custom tools would be helpful.
@@ -158,7 +158,7 @@ by Yosys to perform advanced gate-level optimizations.
An evaluation of Yosys based on real-world designs is included. It is shown
that Yosys can be used as-is to synthesize such designs. The results produced
by Yosys in this tests where successflly verified using formal verification
-and are compareable in quality to the results produced by a commercial
+and are comparable in quality to the results produced by a commercial
synthesis tool.
\bigskip