Verilog中的移位操作有两种:逻辑移位操作(logical)、算数移位操作(arithmetic)。逻辑移位使用“<<”、和“>>”,而算术移位使用“<<<”、和“>>>”,描述以及代码示例如下所示: //本示例使用逻辑、算术右移为例: //逻辑右移(>>), 初始值为4'b1000, 移位结果为4'b0010 module shift(); reg [3:0] v
2.case语句 Verilog语言提供的case语句直接处理多分支选择,通常用于描述译码器、数据选择器、状态机及微处理器的指令译码等,它的一般形式如下: case(表达式) 分支表达式1:语句1; 分支表达式2:语句2; ··· 分支表达式n:语句n; default: 语句n+1; //如果前面列出了表达式所有可能取值,default语句可以省略 endcase...
nonblocking assignments -> sequential blocks -> use '<=' (just think about AND gate connected with a DFF) 3. Behavioral Verilog means no specific hardware design (but should be able to envision it.) 4.Learn to use the function to calculate some value in the compiler process B. The synta...
barrel_shifter #(.WIDTH(TEMP_WIDTH + MAX_SHIFT),.SHIFT_WIDTH(SHIFT_WIDTH),.MODE(1'b1)// Right shift) u_shifter (.operand_i(value_before_shift),.shift_amount(shift_amount),.result_o(value_after_shift) );// Step 8: Extract values for roundingassign{value_before_round, rounding_bits}...
笔者今年面临找工作等诸多事项,准备从老生常谈的hdlbit入手,复习一下基本电路的设计。本系列采用systemverilog作为目标HDL,将自己的代码公布出来,与诸位交流。 愿我们都能在这一年找到满意的工作。 本篇章为Verilog language部分中module:hierarchy和Procedures章节 ...
Example: SystemVerilog code sample module uart (output logic [7:0] data, output logic data_rdy, input serial_in); enum {WAITE, LOAD, READY} State, NextState; logic [2:0] bit_cnt; logic cntr_rst, shift_en; always_ff @(posedge clock, negedge resetN) begin: shifter ...
VERILOG (Computer hardware description language)ELECTRIC power system faultsSIMULATION methods & modelsA testbench is built to verify a functionality of a shift register IC (Integrated Circuit) from stuck-at-faults, stuck-at-1 as well as stuck-at-0. The testbench is suppor...
Here is how they are used in Verilog: HARD_SYNC #( .INIT(1’b0), // Initial value .IS_CLK_INVERTED(1’b0), // configurable inverted clock .LATENCY(2) // 2-3 stage shift register ) uhardsync ( .DIN(DIN), // input Data .DOUT(DOUT), // output Data .CLK(CLK) // Clock );...
VHDL、Verilog,System verilog比较 Digital Simulation White Paper Comparison of VHDL,Verilog and SystemVerilog Stephen Bailey Technical Marketing Engineer Model Technology w w w.m o d e l.c o m
// Shift Operators assign shift_left = a << 2; // Shift left by 2 bits assign shift_right = a >> 2; // Shift right by 2 bits// Reduction Operators assign and_reduce = &a; // AND all bits of 'a' assign or_reduce = |a; // OR all bits of 'a' assign xor_reduce = ^...