BOARD-LEVEL BUILT-IN SELF-REPAIR METHOD OF RAM

This paper describes the method of built-in self-repairing of RAM on board, designs hardware circuit, and logic for the RAM's faults self-repairing system based on FPGA. The key technology is that it utilizes FPGA to test RAM according to some algorithm to find out failure memory units and replace the faulty units with FPGA. Then it can build a memory that has no fault concern to external controller, and realizes the logic binding between external controller and RAM. Micro Controller Unit (MCU) can operate external RAM correctly even if RAM has some fault address units. Conventional MCS-51 is used to simulate the operation of MCU operating external memory. Simulation shows FPGA can complete the faulty address units' mapping and MCU can normally read and write external RAM. This design realizes the RAM's built-in self-repairing on board.

基于FreeRTOS和emWin图形库的工业机械臂示教器软件设计

为了解决工业机械臂示教器软件设计成本高、界面不友好等问题,采用基于ARM Cortex-M7内核的STM32H743为主控芯片,并运用实时操作系统FreeRTOS和emWin图形库设计了一种液晶显示的工业机械臂示教器软件。该示教器软件使用emWin图形库进行软件界面的设计与搭建,采用FreeRTOS操作系统来满足软件多任务的运行,并且能够实现多任务之间的通信与同步,再通过LwIP中UDP协议实现示教器与运动控制卡之间的通信,从而实现示教功能。实验结果表明,该示教器软件显示稳定,性能可靠,界面人机交互功能友好,具有实用价值。