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Gates4

Description

Build a combinational circuit with four inputs, in[3:0].

There are 3 outputs:

out_and: output of a 4-input AND gate.
out_or: output of a 4-input OR gate.
out_xor: output of a 4-input XOR gate.
To review the AND, OR, and XOR operators, see andgate, norgate, and xnorgate.

Bitwise vs. Logical Operators

Description

Earlier, we mentioned that there are bitwise and logical versions of the various boolean operators (e.g., norgate). When using vectors, the distinction between the two operator types becomes important. A bitwise operation between two N-bit vectors replicates the operation for each bit of the vector and produces a N-bit output, while a logical operation treats the entire vector as a boolean value (true = non-zero, false = zero) and produces a 1-bit output.
Look at the simulation waveforms at how the bitwise-OR and logical-OR differ.

HDLBits刷题

Exams/ece241 2013 q12

Introduction
In this question, you will design a circuit for an 8x1 memory, where writing to the memory is accomplished by shifting-in bits, and reading is “random access”, as in a typical RAM. You will then use the circuit to realize a 3-input logic function.

First, create an 8-bit shift register with 8 D-type flip-flops. Label the flip-flop outputs from Q[0]…Q[7]. The shift register input should be called S, which feeds the input of Q[0] (MSB is shifted in first). The enable input controls whether to shift. Then, extend the circuit to have 3 additional inputs A,B,C and an output Z. The circuit’s behaviour should be as follows: when ABC is 000, Z=Q[0], when ABC is 001, Z=Q[1], and so on. Your circuit should contain ONLY the 8-bit shift register, and multiplexers. (Aside: this circuit is called a 3-input look-up-table (LUT)).

待补充…

Vivado安装后添加芯片和插件的方法

安装过程

1. 打开vivado，选择help，点击Add Design Tools or Devices

为树莓派3B+编译OpenWrt固件

1. 源码获取

1.1 获取OpenWrt源代码

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git clone https://github.com/coolsnowwolf/lede.git

1.2 获取插件源代码

方法一：联网获取

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1. sed -i '$a src-git kenzo https://github.com/kenzok8/openwrt-packages' feeds.conf.default
2. sed -i '$a src-git small https://github.com/kenzok8/small' feeds.conf.default
3. git pull
4. ./scripts/feeds update -a && ./scripts/feeds install -a

OpenWrt系统编译

OpenWrt 可以被描述为一个嵌入式的 Linux 发行版。（主流路由器固件有 dd-wrt,tomato,openwrt,padavan四类）对比一个单一的、静态的系统，OpenWrt的包管理提供了一个完全可写的文件系统，从应用程序供应商提供的选择和配置，并允许您自定义的设备，以适应任何应用程序。

注意

1. 不要用 root 用户进行编译。
2. 国内用户编译前准备好科学上网工具，有很多资源需要从国外网站下载。
3. 默认登陆IP 192.168.1.1 密码 password。