Stefan Holst 1 year ago
parent
commit
8957db48ab
  1. 12
      src/kyupy/logic.py

12
src/kyupy/logic.py

@ -13,14 +13,14 @@ Utility functions defined here follow these conventions. @@ -13,14 +13,14 @@ Utility functions defined here follow these conventions.
In general, the bits in these constants have the following meaning:
* bit0: Final/settled binary value of a signal
* bit1: Initial binary value of a signal
* bit2: Activity or transitions are present on a signal
* bit0: Final/settled binary value of a signal
* bit1: Initial binary value of a signal
* bit2: Activity or transitions are present on a signal
Except when bit0 differs from bit1, but bit2 (activity) is 0:
* bit0 = 1, bit1 = 0, bit2 = 0 means ``UNKNOWN`` in 4-valued and 8-valued logic.
* bit0 = 0, bit1 = 1, bit2 = 0 means ``UNASSIGNED`` in 4-valued and 8-valued logic.
* bit0 = 1, bit1 = 0, bit2 = 0 means ``UNKNOWN`` in 4-valued and 8-valued logic.
* bit0 = 0, bit1 = 1, bit2 = 0 means ``UNASSIGNED`` in 4-valued and 8-valued logic.
2-valued logic only considers bit0, but should store logic one as ``ONE=0b011`` for interoperability.
4-valued logic only considers bit0 and bit1.
@ -28,12 +28,14 @@ Except when bit0 differs from bit1, but bit2 (activity) is 0: @@ -28,12 +28,14 @@ Except when bit0 differs from bit1, but bit2 (activity) is 0:
Logic values are stored in numpy arrays of data type ``np.uint8``.
The axis convention is as follows:
* The **last** axis goes along patterns/vectors. I.e. ``values[...,0]`` is pattern 0, ``values[...,1]`` is pattern 1, etc.
* The **second-to-last** axis goes along the I/O and flip-flops of circuits. For a circuit ``c``, this axis is usually
``len(c.s_nodes)`` long. The values of all inputs, outputs and flip-flops are stored within the same array and the location
along the second-to-last axis is determined by the order in ``c.s_nodes``.
Two storage formats are used in KyuPy:
* ``mv...`` (for "multi-valued"): Each logic value is stored in the least significant 3 bits of ``np.uint8``.
* ``bp...`` (for "bit-parallel"): Groups of 8 logic values are stored as three ``np.uint8``. This format is used
for bit-parallel logic simulations. It is also more memory-efficient.

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