diff options
Diffstat (limited to 'README.md')
| -rw-r--r-- | README.md | 7 |
1 files changed, 4 insertions, 3 deletions
@@ -417,9 +417,10 @@ Verilog Attributes and non-standard features port of a LUTRAM cell prevents `abc9` from interpreting any `Q` -> `D` paths as a combinatorial loop. -- The port attribute ``abc_carry_in`` and ``abc_carry_out`` attributes mark - the carry-in and carry-out ports of a box. This information is necessary for - `abc9` to preserve the integrity of carry-chains. +- The port attribute ``abc_carry`` marks the carry-in (if an input port) and + carry-out (if output port) ports of a box. This information is necessary for + `abc9` to preserve the integrity of carry-chains. Specifying this attribute + onto a bus port will affect its most significant bit. Non-standard or SystemVerilog features for formal verification |