/*!
    \file    readme.txt
    \brief   description of EXMC SDRAM DeepSleep demo
    
    \version 2025-08-20, V3.3.2, demo for GD32F4xx
*/

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*/ 

  This demo is based on the GD32450Z-EVAL-V1.1 board, it shows how to use EXMC peripheral
to control SDRAM memory work with PMU(deepsleep mode).
  Firstly, write data to SDRAM, then make MCU enter into deepsleep mode and light on LED2.
Secondly, press the USER key to wakeup the MCU. After wakeup, MCU read data from SDRAM
and compare with the data we written just now. If the test pass, LED1 will be 
turned on. Otherwise,turn on the LED3.
  The timing parameters are calculated according to the 200MHz system clock.
  P2,P3,JP16,JP17,JP18 must be fitted to the SDRAM port,JP13 must be fitted
to the USART port.
