.. _sofa_chd_timing:

Timing Annotation
-----------------

.. _sofa_chd_timing_clb:

Configurable Logic Block
^^^^^^^^^^^^^^^^^^^^^^^^

The path delays in :numref:`fig_sofa_chd_fle_arch_timing` are listed in :numref:`table_sofa_chd_fle_arch_timing`.

.. _fig_sofa_chd_fle_arch_timing:

.. figure:: ./figures/sofa_chd_fle_arch_timing.svg
  :width: 80%
  :alt: Schematic of a logic element used in SOFA CHD FPGA

  Schematic of a logic element used in SOFA CHD FPGA

.. _table_sofa_chd_fle_arch_timing:

.. table:: Path delays of logic element in the SOFA CHD FPGA

  +-------------------------+------------------------------+
  | Path / Delay            | TT (unit: ns)                |
  +=========================+==============================+
  | in0 -> LUT3_out[0]      | 0.86                         |
  +-------------------------+------------------------------+
  | in1 -> LUT3_out[0]      | 0.58                         |
  +-------------------------+------------------------------+
  | in2 -> B                | 0.16                         |
  +-------------------------+------------------------------+
  |   B -> LUT3_out[0]      | 0.32                         |
  +-------------------------+------------------------------+
  | in0 -> LUT3_out[1]      | 0.91                         |
  +-------------------------+------------------------------+
  | in1 -> LUT3_out[1]      | 0.63                         |
  +-------------------------+------------------------------+
  |   B -> LUT3_out[1]      | 0.34                         |
  +-------------------------+------------------------------+
  | in0 -> LUT4_out         | 1.20                         |
  +-------------------------+------------------------------+
  | in1 -> LUT4_out         | 0.92                         |
  +-------------------------+------------------------------+
  | in2 -> LUT4_out         | 0.78                         |
  +-------------------------+------------------------------+
  | in3 -> LUT4_out         | 0.52                         |
  +-------------------------+------------------------------+
  | LUT3_out[0] -> A        | 0.17                         |
  +-------------------------+------------------------------+
  | LUT4_out[0] -> A        | 0.18                         |
  +-------------------------+------------------------------+
  | A -> out[0]             | 0.48                         |
  +-------------------------+------------------------------+
  | A -> FF[0]              | 0.15                         |
  +-------------------------+------------------------------+
  | FF[0] -> out[0]         | 0.48                         |
  +-------------------------+------------------------------+
  | LUT3_out[1] -> out[1]   | 0.47                         |
  +-------------------------+------------------------------+
  | LUT3_out[1] -> FF[1]    | 0.16                         |
  +-------------------------+------------------------------+
  | FF[1] -> out[1]         | 0.37                         |
  +-------------------------+------------------------------+
  | regin -> FF[0]          | 0.15                         |
  +-------------------------+------------------------------+
  | FF[0] -> FF[1]          | 0.16                         |
  +-------------------------+------------------------------+


.. _sofa_chd_timing_io:

I/O Block
^^^^^^^^^

The path delays of I/O blocks in SOFA CHD FPGA is same as the SOFA HD FPGA. See details in :ref:`sofa_hd_timing_io`. 

.. _sofa_chd_timing_routing:

Routing Architecture
^^^^^^^^^^^^^^^^^^^^

The path delays in :numref:`fig_sofa_hd_routing_arch` are listed in :numref:`table_sofa_chd_routing_arch_timing`.

.. _table_sofa_chd_routing_arch_timing:

.. table:: Path delays of routing blocks in the SOFA CHD FPGA

  +---------------------------+------------------------------+
  | Path / Delay              | TT (unit: ns)                |
  +===========================+==============================+
  | A -> B                    | 0.81                         |
  +---------------------------+------------------------------+
  | A -> C                    | 0.81                         |
  +---------------------------+------------------------------+
  | A -> D                    | 0.81                         |
  +---------------------------+------------------------------+
  | B -> E                    | 0.57                         |
  +---------------------------+------------------------------+