recitation_week_11

# recitation_week_11 - module Dff1 (D, clk, Q, Qbar); input...

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In this recitation, the goal is to let the students get familiar with both sequential circuit design and Verilog. You may first help the students with their problems with the Verilog simulator. All students are supposed to be able to run the simulator, and the instructions are given in HW5. Then you may ask them to work on this problem, and help them with getting the simulation waveforms: Design a 2-bit counter counting in the order of 0,3,1,2,0,3,1,2…. You may start with the next- state table: Q1 Q0 D1 D0 0 0 1 1 0 1 1 0 1 0 0 0 1 1 0 1 Then, get D1=~Q1 and D0=~(Q1^Q0). You may then ask them to write a Verilog module of the 2-bit counter with using this basic D flip- flop module, and run the simulator to get the waveform:

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Unformatted text preview: module Dff1 (D, clk, Q, Qbar); input D, clk; output reg Q, Qbar; initial begin Q = 0; Qbar = 1; end always @(posedge clk) begin #1 Q = D; #1 Qbar = ~Q; end endmodule module counter_2_bit (clk, Q); input clk; output [1:0] Q; wire Q1, Q1bar, Q0, Q0bar, D1, D0; assign D0 =~(Q1^Q0); Dff1 C0 (D0, clk, Q0, Q0bar); assign D1 = ~Q1; Dff1 C1 (D1, clk, Q1, Q1bar); assign Q[1] = Q1; assign Q[0] = Q0; endmodule module test_bench (); wire clr, clk; reg osc; initial begin osc = 0; end always begin #10 osc = ~osc; end assign clr=1; assign clk=osc; wire [1:0] c2bitoutput; counter_2_bit counter2bit(clk, c2bitoutput); endmodule...
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## This document was uploaded on 12/04/2011.

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recitation_week_11 - module Dff1 (D, clk, Q, Qbar); input...

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