70 lines
1.5 KiB
Verilog
70 lines
1.5 KiB
Verilog
// DESCRIPTION: Verilator: Verilog Test module
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//
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// This file ONLY is placed under the Creative Commons Public Domain, for
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// any use, without warranty, 2003 by Wilson Snyder.
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// SPDX-License-Identifier: CC0-1.0
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module t (/*AUTOARG*/
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// Inputs
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clk
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);
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input clk;
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integer cyc; initial cyc=1;
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// [16] is SV syntax for [0:15]
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reg [7:0] memory8_16 [16];
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reg m_we;
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reg [3:1] m_addr;
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reg [15:0] m_data;
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always @ (posedge clk) begin
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// Load instructions from cache
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memory8_16[{m_addr,1'd0}] <= 8'hfe;
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if (m_we) begin
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{memory8_16[{m_addr,1'd1}],
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memory8_16[{m_addr,1'd0}]} <= m_data;
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end
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end
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reg [7:0] memory8_16_4;
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reg [7:0] memory8_16_5;
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// Test complicated sensitivity lists
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always @ (memory8_16[4][7:1] or memory8_16[5]) begin
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memory8_16_4 = memory8_16[4];
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memory8_16_5 = memory8_16[5];
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end
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always @ (posedge clk) begin
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m_we <= 0;
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if (cyc!=0) begin
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cyc <= cyc + 1;
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if (cyc==1) begin
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m_we <= 1'b1;
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m_addr <= 3'd2;
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m_data <= 16'h55_44;
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end
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if (cyc==2) begin
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m_we <= 1'b1;
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m_addr <= 3'd3;
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m_data <= 16'h77_66;
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end
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if (cyc==3) begin
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m_we <= 0; // Check we really don't write this
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m_addr <= 3'd3;
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m_data <= 16'h0bad;
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end
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if (cyc==5) begin
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if (memory8_16_4 != 8'h44) $stop;
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if (memory8_16_5 != 8'h55) $stop;
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if (memory8_16[6] != 8'hfe) $stop;
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if (memory8_16[7] != 8'h77) $stop;
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$write("*-* All Finished *-*\n");
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$finish;
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end
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end
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end
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endmodule
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