Application of periodic and distributed refresh algorithm in SDRAM controller

Chun-feng WU; Zhi-qian WANG; Shao-jin LIU; Yu-sheng LIU

doi:10.3788/YJYXS20183305.0405

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Application of periodic and distributed refresh algorithm in SDRAM controller

Image Processing | 更新时间：2020-08-12

- Application of periodic and distributed refresh algorithm in SDRAM controller
- Chinese Journal of Liquid Crystals and Displays Vol. 33, Issue 5, Pages: 405-411(2018)
- 作者机构：
  
  1.中国科学院长春光学精密机械与物理研究所, 吉林长春 130033
  2.中国科学院大学, 北京 100049
- 作者简介：
- 基金信息：
- DOI：10.3788/YJYXS20183305.0405
  CLC： TP368.1
- Received：27 December 2017，
  
  Accepted：01 February 2018，
  
  Published：2018-05
- 稿件说明：
移动端阅览
Chun-feng WU, Zhi-qian WANG, Shao-jin LIU, et al. Application of periodic and distributed refresh algorithm in SDRAM controller[J]. Chinese journal of liquid crystals and displays, 2018, 33(5): 405-411.
DOI：

Chun-feng WU, Zhi-qian WANG, Shao-jin LIU, et al. Application of periodic and distributed refresh algorithm in SDRAM controller[J]. Chinese journal of liquid crystals and displays, 2018, 33(5): 405-411. DOI： 10.3788/YJYXS20183305.0405.

摘要

针对SDRAM控制器的自动刷新指令控制方法，提出了一种周期分散刷新算法。首先，使用Verilog HDL编写SDRAM控制器。在读写过程，根据SDRAM时钟频率和存储阵列行数，确定连续读/写的次数

。连续

次读/写操作后，控制器发出一次自动刷新指令。在非读写过程，根据状态机长期处于空闲状态的特点，控制器定时发出自动刷新请求，从而周期地发出自动刷新指令。然后，基于光电测量系统对算法进行验证。实验结果表明控制器周期、及时、准确地发出了自动刷新指令，读写指令执行效率提高了0.39%。该算法解决了自动刷新指令滞后的问题，提高了读写指令执行效率，具有良好的移植性。

Abstract

Aiming at the control method of Auto_Refresh instruction in SDRAM controller

a periodic and distributed refresh algorithm is proposed. First

A SDRAM controller is compiled by Verilog HDL. In reading or writing process

the continuous times of reading or writing is confirmed by SDRAM clock frequency and the row number of L-BANK. An Auto_Refresh instruction is given after

reading or

writing instructions. Because FSM is almost always in the state of IDLE in the process after reading and writing

Auto_Refresh instruction is given periodically. Then

the Photoelectric Measurement System is used for experimental verification. The experimental results show that SDRAM controller can give Auto_Refresh periodically

timely and accurately

and the execution efficiency of reading and writing instructions is improved by 0.39%. This algorithm solves the problem of Auto_Refresh instruction lagged behind

improves the execution efficiency of reading and writing instructions

and has good portability.

关键词

Keywords

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