.. _sdram_example:

SDRAM example
==========================

概述
------

SDRAM示例工程展示了读写内部或外部SDRAM存储器的性能。

硬件设置
------------

无特殊设置

运行现象
------------

当工程正确运行后，串口终端会输出如下信息：

.. code-block:: console

   sdram example start @ 166666666
   Dcache Enabled
   Comparison test
   comparison test: from 0x40000000 to 0x42000000
   d-cached enabled and flushed
   **  comparison succeeded
   Testing SDRAM
   d-cached enabled
   read performance @0x40000000, 32768KB
   read throughput: 319576.71 KB/s
   write performance @0x40000000, 32768KB
   write throughput: 320431.43 KB/s
   Dcache Disabled
   Comparison test
   comparison test: from 0x40000000 to 0x42000000
   d-cached disabled
   **  comparison succeeded
   Testing SDRAM
   d-cached disabled
   read performance @0x40000000, 32768KB
   read throughput: 20502.65 KB/s
   write performance @0x40000000, 32768KB
   write throughput: 35664.65 KB/s
   sdram example end