.. _fchan_subset:

fchan_subset
============

Description
'''''''''''

| 
|  Name: Channel Subset
| % Runtime-configurable selection of which data to keep within each block
| % Typically used on the input to a waveform memory

Pinout
''''''

.. _fig:fchan_subset_block:
.. figure:: fchan_subset_block.png
    :alt: Schematic symbol

Parameters
''''''''''

.. list-table:: fchan_subset_param_table
   :header-rows: 1

   * - Name
     - Min
     - Max
     - Default
     - Description
   * - KEEP_OLD
     - ?
     - ?
     - 0
     - 
   * - a_dw
     - ?
     - ?
     - 20
     - 
   * - o_dw
     - ?
     - ?
     - 20
     - 
   * - len
     - ?
     - ?
     - 16
     - 

Ports
'''''

.. list-table:: fchan_subset_port_table
   :header-rows: 1

   * - Signal
     - Direction
     - Description
   * - clk
     - Input
     - 
   * - reset
     - Input
     - 
   * - keep[len-1:0]
     - Input
     - 
   * - a_data[a_dw-1:0]
     - Input
     - 
   * - a_gate
     - Input
     - 
   * - o_data[o_dw-1:0]
     - Output
     - 
   * - o_gate
     - Output
     - 
   * - time_err
     - Output
     - 

Implementation and use
''''''''''''''''''''''

The `portable`_ `Verilog`_
implementation can be found in :ref:`fchan_subset_source`

.. _`portable`: https://en.wikipedia.org/wiki/Software_portability
.. _`Verilog`: https://en.wikipedia.org/wiki/Verilog