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ASIC and FPGA Flow Synopsis

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- December 28, 2021

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Different Ways To Design ROM Verilog HDL

- November 18, 2021

ROM is an acronym for Read-Only Memory. It refers to computer memory chips containing permanent or semi-permanent data. ROM is non-volatile; even after you turn off your computer, the contents of ROM will remain. You may see In any ASIC and FPGA designs. Combinational Block module ROM_code(data, addr, Enable); parameter width=16; output reg [width-1:0] data; input[3:0] addr; input Enable; reg [width-1:0] ROM[width-1:0]; always @(Enable) begin ROM[0] =16'h2000; ROM[1] =16'h2001; ROM[2] =16'h2002; ROM[3] =16'h2003; ROM[4] =16'h2004;; ROM[5] =16'h2051; ROM[6] =16'h2301; ROM[7] =16'h2061; ROM[8] =16'h9001; ROM[9] =16'h2201; ROM[10]=16'h1001; ROM[11]=16'h2101; ROM[12]=16'h2901; ROM[13]=16'h2050; ROM[14]=16'h2301; ROM[15]=16'h2071; Data=ROM[addr]; end endmodule Sequential Logic module ROM_code(data, addr, clk); parameter width=16; output reg [width-1:0] data; input[3:0] addr; input clk; reg [width-1:0] ROM[width-1:0]; a...

stratified event queue in Verilog

- February 26, 2022

stratified event queue in Verilog 1) Active Region : Events which occur at the current simulation time and can be executed in any order. These include blocking assignments, continuous assignments, $display commands, evaluation of instance and primitive inputs followed by updates of primitive and instance outputs, and the evaluation of nonblocking RHS expressions. Ex : a=b; 2) Inactive Region: Events which are processed after the processing of active events. In this queue, #0 delay assignments have been scheduled. Ex : a= #0 b; 3) Nonblocking Region: Events evaluated during previous simulation time but are assigned at this simulation time after the processing of active and inactive events. It is in this queue where the LHS of nonblocking assignment is updated. Ex : a <=b; 4) Postpone Region: Events that are processed after all the active, inactive, and nonblocking assigned update events have been processed. This que...

Number of one's Detection in Input - Verilog Implementation

- November 21, 2021

Number of one's Detection: `timescale 1ns / 1ps ////////////////////////////////////////////////////////////////////////////////// // Company: Weekendvlsi.blogspot.com // Engineer: Weekendvlsi // Create Date: 20-11-2021 // Design Name: Number of one's Detection // Module Name: num_ones ////////////////////////////////////////////////////////////////////////////////// module num_ones( input [15:0] In, output reg [5:0] ones_detect ); integer i; always@(In) begin ones_detect= 0; for(i=0;i<16;i=i+1) begin if(In[i] == 1'b1) ones_detect = ones_detect + 1; end end endmodule TEST BENCH: module tb; reg [15:0] In; wire [5:0] ones_detect; num_ones dut ( In,ones_detect); initial begin In...

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