嵌入式操作系统加载模式选择电路
本发明提出了一种嵌入式操作系统加载模式选择电路。本发明通过下述技术方案予以实现:CPLD的总线读写器分别通过并行总线连接GPP;以太网链路状态寄存器连接PHY的链路建立指示管脚;外设复位控制发生器连接FLASH的复位管脚和连接PHY的复位管脚;CPU复位控制发生器连接GPP的复位管脚;总线读写器接收到GPP的访问信号后,将以太网链路状态寄存器的值输出给GPP;以太网链路状态寄存器通过PHY的链路建立指示管脚电平,判断链路是否有效,有效则将以太网链路状态寄存器改成1,无效则将以太网链路状态寄存器改成0。本发明解决了现有技术通过串口命令实现加载模式选择的方案,需要等待用户输入超时,影响加载速度的问...
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| Format | Patent |
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| Language | Chinese |
| Published |
26.05.2023
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| Subjects | |
| Online Access | Get full text |
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| Summary: | 本发明提出了一种嵌入式操作系统加载模式选择电路。本发明通过下述技术方案予以实现:CPLD的总线读写器分别通过并行总线连接GPP;以太网链路状态寄存器连接PHY的链路建立指示管脚;外设复位控制发生器连接FLASH的复位管脚和连接PHY的复位管脚;CPU复位控制发生器连接GPP的复位管脚;总线读写器接收到GPP的访问信号后,将以太网链路状态寄存器的值输出给GPP;以太网链路状态寄存器通过PHY的链路建立指示管脚电平,判断链路是否有效,有效则将以太网链路状态寄存器改成1,无效则将以太网链路状态寄存器改成0。本发明解决了现有技术通过串口命令实现加载模式选择的方案,需要等待用户输入超时,影响加载速度的问题。
The invention provides an embedded operating system loading mode selection circuit which is realized through the following technical schemes: a bus reader-writer is connected with a CPLD by parallel bus; an Ethernet link state register is connected with a link establishment indicator pin of a PHY; a peripheral reset control generator is connected with a FLASH reset pin and a reset pin of the PHY;a CPU reset control generator is connected with the reset pin of a GPP; when the bus reader-writer receives a GPP access signal, the value of the Ethernet link state register is output to the GPP; theEthernet link state register establishes an indicator PIN level through the PHY link, and determines whether the link is v |
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| Bibliography: | Application Number: CN201710834099 |