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// DESCRIPTION: Verilator: Verilog Test module
//
// This file ONLY is placed under the Creative Commons Public Domain, for
// any use, without warranty, 2017 by Wilson Snyder.
// SPDX-License-Identifier: CC0-1.0
module t (/*AUTOARG*/);
reg [5:0] addr;
parameter BANKS = 6;
parameter ROWS = 8;
reg [2:0] bank;
reg [2:0] row;
integer a;
integer used[BANKS][ROWS];
// Test loop
initial begin
for (a = 0; a < BANKS*ROWS; ++a) begin
addr[5:0] = a[5:0];
hash (addr, bank, row);
used [bank][row] ++;
if (used [bank][row] > 1) begin
$write ("Error: Hash failed addr=%x bank=%x row=%x\n", addr, bank, row);
end
end
$write("*-* All Finished *-*\n");
$finish;
end
task hash (input [5:0] addr,
output [2:0] bank,
output [2:0] row);
reg [1:0] third;
reg [1:0] fourth;
third = {addr[5], addr[4]};
fourth = {addr[3] ^ addr[1],
addr[2] ^ addr[0]};
case (third)
2'h0:
case (fourth)
2'h0: begin bank = 3'h0; row = {1'h0, addr[1:0]}; end
2'h1: begin bank = 3'h1; row = {1'h0, addr[1:0]}; end
2'h2: begin bank = 3'h2; row = {1'h0, addr[1:0]}; end
2'h3: begin bank = 3'h3; row = {1'h0, addr[1:0]}; end
endcase
2'h1:
case (fourth)
2'h0: begin bank = 3'h0; row = {1'h1, addr[1:0]}; end
2'h1: begin bank = 3'h1; row = {1'h1, addr[1:0]}; end
2'h2: begin bank = 3'h4; row = {1'h0, addr[1:0]}; end
2'h3: begin bank = 3'h5; row = {1'h0, addr[1:0]}; end
endcase
2'h2:
case (fourth)
2'h0: begin bank = 3'h2; row = {1'h1, addr[1:0]}; end
2'h1: begin bank = 3'h3; row = {1'h1, addr[1:0]}; end
2'h2: begin bank = 3'h4; row = {1'h1, addr[1:0]}; end
2'h3: begin bank = 3'h5; row = {1'h1, addr[1:0]}; end
endcase
2'h3: $stop;
endcase
endtask
endmodule
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