Sometimes, you want to create a wide gate that operates on all of the bits of one vector, like (a[0] & a[1] & a[2] & a[3] ... ), which gets tedious if the vector is long. The reduction operators can do AND, OR, and XOR of the bits of a vector, producing one bit of...
verilog reg signed [7:0] a, b, sum; initial begin a = 120; // 01111000 in binary b = 10; // 00001010 in binary sum = a + b; // sum will be -126 (overflow, as 120 + 10 = 130 which is out of range for 8-bit signed) $display("Sum: %d", sum); // Displays -126 e...
i_bit1 = 1, i_bit2 = 0, i_carry = 0, o_sum = 1, o_carry = 0 i_bit1 = 1, i_bit2 = 0, i_carry = 1, o_sum = 0, o_carry = 1 i_bit1 = 1, i_bit2 = 1, i_carry = 0, o_sum = 0, o_carry = 1 i_bit1 = 1, i_bit2 = 1, i_carry = 1, o_sum =...
i_bit1 = 1, i_bit2 = 0, i_carry = 0, o_sum = 1, o_carry = 0 i_bit1 = 1, i_bit2 = 0, i_carry = 1, o_sum = 0, o_carry = 1 i_bit1 = 1, i_bit2 = 1, i_carry = 0, o_sum = 0, o_carry = 1 i_bit1 = 1, i_bit2 = 1, i_carry = 1, o_sum =...
题目:Create a half adder. A half adder adds two bits (with no carry-in) and produces a sum and carry-out. 大白话:构建一个半加器。 首先复习复习一下半加器的逻辑表达式,sum是和,cout是进位: sum=a^b cout=a&b 有了逻辑表达式就很好写答案了: ...
moduledimm(addr,ba,rasx,casx,csx,wex,cke,clk,dqm,data,dev_id);parameter[31:0]MEM_WIDTH=16,MEM_SIZE=8;...genvar i;case({MEM_SIZE,MEM_WIDTH}){32'd8, 32'd16}:// 8Meg x 16 bits wide begin: memory for (i=0; i<4; i=i+1) begin:word16 sms_08b216t0 p(.clk(clk), .csb...
input logic [1:0] parity, // 2-bit parity bits output logic [7:0] status // 8-bit status register output ); timeunit 1ns; timeprecision 1ns; always_ff @(posedge clk or negedge rstN) // async reset if(!rstN) // active-low reset ...
a simple method of detecting errors when transmitting data through an imperfect channel. Create a circuit that will compute a parity bit for a 8-bit byte (which will add a 9th bit to the byte). We will use "even" parity, where the parity bit is just the XOR of all 8 data bits. ...
localparam N = log2(M); // number of bits in counter reg [N-1:0] r_reg; wire [N-1:0] r_next; // body // register always@(posedge clk, negedge rst_n) if(!rst_n) r_reg <= 0; else r_reg <= r_next; // next-state logic ...
l Automatic width extension beyond 32 bits 在Verilog-1995中,在不指定基数的情况下为大于32位的变量赋高阻值,只能使其低32位为高阻值,其他高位会被设置为0,此时需要指定基数值才能将高位赋值为高阻。 Verilog-1995: parameter WIDTH = 64; reg [WIDTH-1:0] data; ...