8 Bit Serial To Parallel Converter Verilog Code

I am making a parallel to serial converter using ring counter in verilog. The ring counter is working fine but the Parallel to serial converter is not working properly and I am getting x undefined result. I am providing the code kindly help me finding the problem.

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TOP module PtoSTOP; reg clk,rst; wire [3:0] myout; wire out; Ring a(clk,rst,myout); parToser x(myout,clk,rst,out); initial begin clk=1; rst=1; #1 rst=0; end always #2 clk=~clk; endmodule Parallel TO Serial Converter module parToser(myout,clk,rst,out); input clk,rst; input [3:0] myout; output reg out; reg [2:0]i; always @(posedge clk or posedge rst) begin if(rst) begin out. I think the main issue you are seeing is part of parToser. You have reg [2:0]i; which you increment and use to address input [3:0] myout; but i can hold values 0 to 7, half of which is outside the address range of [3:0] myout.

You should be seeing a simulation error about out of range addressing. Also you have included a few flip-flops with a reset condition but not added the reset to the sensitivity list in 'parToser' & 'Ring': always @(posedge clk) Should be: always @(posedge clk or posedge rst) With out this trigger your out, i and myout variables will be x, as they have not been set to a known condition. NB: parToser i = i+1; should be i.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 module piso1 (sout,sin,clk ); output sout; input [ 3: 0 ]sin; input clk; wire [ 3: 0 ]q; inv u1 (p,sl ); and1 u2 (n,sin [ 1 ],p ); and1 u3 (r,sl,q [ 0 ] ); or1 u4 (s,n,r ); and1 u5 (t,sin [ 2 ],p ); and1 u6 (u,sl,q [ 1 ] ); or1 u7 (v,u,t ); and1 u8 (w,sin [ 3 ],p ); and1 u9 (y,sl,q [ 2 ] ); or1 u10 (z,w,y ); dff1 u11 (q [ 0 ],sin [ 0 ],clk ); dff1 u12 (q [ 1 ],s,clk ); dff1 u13 (q [ 2 ],v,clk ); dff1 u14 (q [ 3 ],z,clk ); assign sout = q [ 3 ]; endmodule.

8-bit serial to parallel convertor verilog with synchronization Hi I need to write a code for rs-232 serial data to parallel convertor.I can write Serial to parallel code, but the problem is i have to write a code such that i have to ensure synchronization with the sending device.