Inferring sequential logic verilog11/19/2023 ![]() ![]() I've added a done signal to the module interface to make this explicit. Secondly, an elaborate state machine isn't required the module can simply produce a final result four clocks after each activation of the start signal. Rather than addressing the many problems in your source code, let me just show how I'd implement the module you describe.įirst, I wouldn't use a sub-module to build the adder synthesis tools are perfectly able to create adders from behavioral code. PS:i am new to verilog so please excuse my noobness :) Module code for ripple carry adder `include "fulladder.v" Rca_4bit adder(product,c_out,multiplicand,product, 0) //adder block State = SHIFT_STATE //else move to shift state directly State = ADD_STATE //only add if there's a 1 in the multiplicand Product = 4'h0 //load accumulator with zeros Parameter WAIT_STATE = 0, LOAD_STATE = 1, ADD_STATE = 2,SHIFT_STATE = 3 ![]() Module seq_mult_4bit(output product,input a,b,input clock,input reset,input start) ![]() Main module code which does not compile since i have included the rca4bit module inside the sequential always block `include "rca4bit.v" Please help in modifying the ripple carry adder code i have included the code for reference Now i need to trigger it from the multiplier module. I have tested the adder module and it works fine. I am having a separate module for the 4 bit ripple carry adder. I am trying to implement a sequential shift and add 4bit multiplier as shown in the image. ![]()
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