shift_tb.v

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// Copyright 2007 Altera Corporation. All rights reserved.  
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//
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/////////////////////////////////////////////////////////////////////////////

module shift_tb ();

parameter WIDTH = 32;
parameter DW = 5;

reg [WIDTH-1:0] din;
reg [DW-1:0] dist;
reg fail;

wire [WIDTH-1:0] dout_r,dout_s,dout_b,dout_c;

rotate_internal r (.din(din),.dout(dout_r),.distance(dist));
	defparam r .WIDTH = WIDTH;
	defparam r .DIST_WIDTH=DW;
	defparam r .GENERIC = 1;

rotate_internal s (.din(din),.dout(dout_s),.distance(dist));
	defparam s .WIDTH = WIDTH;
	defparam s .DIST_WIDTH=DW;
	defparam s .GENERIC = 0;

barrel_shift b (.din(din),.dout(dout_b),.distance(dist));
	defparam b .RIGHT = 1;
	defparam b .WIDTH = WIDTH;
	defparam b .DIST_WIDTH=DW;
	
barrel_shift c (.din(dout_b),.dout(dout_c),.distance(dist));
	defparam c .RIGHT = 0;
	defparam c .WIDTH = WIDTH;
	defparam c .DIST_WIDTH=DW;

initial begin
	dist = 0;
	din = 0;
	fail = 0;
	#100000 if (!fail) $display ("PASS");
	$stop();
end

always begin 
	#1000 din = $random;
	dist = $random;
	#1000 if (dout_r != dout_s || dout_b != dout_s || dout_c != din) begin
		$display ("Mismatch at time %d",$time);
		fail = 1;
	end
end
endmodule