1746-RT26
1746-RT26
1746-RT26
1 实现双处理器的一般方法
① 使用双口RAM。这种方法方便地实现了CPU之间的通信，在选择CPU接口时具有较大的灵活性；但这种方法会增加电路设计的难度和成本。
② 利用I/O口进行并行通信。这种方法既要用I/O口传送数据，又要用I/O口来进行传送的控制，因此占用较多的I/O口；而且控制过程涉及进行通信的两个CPU，软件设计比较复杂。
③ 利用串口进行通信。使用UART或I2C总线来联系CPU也是常用的方法。这种方法实现简单，只是传输速度较慢。
④共享内存。共享内存实际上又有两种不同实现。种如LON网络的Neuron节点芯片，利用不同时序实现共享内存。这种方法必须制成芯片，把CPU和RAM封装在一起，一般情况下实现困难。第二种如96系列单片机，使用HOLD线先挂起其中一单片机的总线，以使用其内存。这种方法简单而且传输速度快，在具有HOLD功能的CPU系统中经常使用这种方法实现双CPU。
备货，备货，降降降，火火火，火火火……
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