.. highlight:: c

.. _pragma_interface_memory_variable:

Configure Global as AXI4 Interface 
----------------------------------

**Syntax**


``#pragma LEGUP interface variable(<var_name>) type(axi_slave) concurrent_access(true|false)``

**Description**

This pragma specifies an AXI4 slave interface.
When the `concurrent_access` option is set to true (default to false), the
external logic can read/write the AXI4 slave interface while the LegUp module is
running.  The concurrent access will however reduce the LegUp module's
throughput to access the memory.
More details in :ref:`rtl_interface` section.

**Parameters**


+-----------------------+----------------+----------+----------------+-------------------------------------------------------+
|     Parameter         |   Value        | Optional |     Default    |                    Description                        |
+=======================+================+==========+================+=======================================================+
|    ``variable``       |  String        |    No    |                | Variable name                                         |
+-----------------------+----------------+----------+----------------+-------------------------------------------------------+
|      ``type``         | ``axi_slave``  |    No    |                | Interface type                                        |
+-----------------------+----------------+----------+----------------+-------------------------------------------------------+
| ``concurrent_access`` | ``true|false`` |    Yes   |   ``false``    | Enable/disable concurrent access                      |
+-----------------------+----------------+----------+----------------+-------------------------------------------------------+

**Position**

Before the global variable declaration.

**Examples**


.. code-block:: c

  #pragma LEGUP interface variable(b) type(axi_slave) concurrent_access(true)
  int b[SIZE];

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