--------------------------------------------------------------------
--
--	LPM_BUSTRI Parameterized Megafunction
--
--  Copyright (C) 1991-2013 Altera Corporation
--  Your use of Altera Corporation's design tools, logic functions  
--  and other software and tools, and its AMPP partner logic  
--  functions, and any output files from any of the foregoing  
--  (including device programming or simulation files), and any  
--  associated documentation or information are expressly subject  
--  to the terms and conditions of the Altera Program License  
--  Subscription Agreement, Altera MegaCore Function License  
--  Agreement, or other applicable license agreement, including,  
--  without limitation, that your use is for the sole purpose of  
--  programming logic devices manufactured by Altera and sold by  
--  Altera or its authorized distributors.  Please refer to the  
--  applicable agreement for further details. 
--  
--  Quartus II 13.1.0 Build 162 10/23/2013 
--
--	Version 2.0
--
--------------------------------------------------------------------


PARAMETERS
(
	LPM_WIDTH
);

SUBDESIGN lpm_bustri
(
	tridata[LPM_WIDTH-1..0]	: BIDIR;
	data[LPM_WIDTH-1..0]	: INPUT = VCC;
	enabletr				: INPUT = VCC;
	enabledt				: INPUT = VCC;
	result[LPM_WIDTH-1..0]	: OUTPUT;
)

VARIABLE
	% Are the enable inputs used? %
	IF (USED(enabledt)) GENERATE
		dout[LPM_WIDTH-1..0]	: TRI;
	END GENERATE;
	IF (USED(enabletr)) GENERATE
		din[LPM_WIDTH-1..0]		: TRI;
	END GENERATE;

BEGIN

	ASSERT (LPM_WIDTH > 0)
			REPORT "Value of LPM_WIDTH parameter value must be greater than 0"
			SEVERITY ERROR
			HELP_ID LPM_BUSTRI_WIDTH;

	ASSERT (USED(enabledt) & USED(data))
		REPORT "lpm_bustri function requires data[] port -- Altera recommends using the TRI primitive instead"
		SEVERITY ERROR
		HELP_ID LPM_BUSTRI_DATA;

	% Connect buffers if they are used %
	IF (USED(enabledt)) GENERATE
		dout[].oe = enabledt;
		dout[] = data[];
		tridata[] = dout[];
	END GENERATE;

	IF (USED(enabletr)) GENERATE
		din[].oe = enabletr;
		din[] = tridata[];
		result[] = din[];
	ELSE GENERATE
		result[] = tridata[];
	END GENERATE;
	IF !USED(result) GENERATE
		result[] = GND;
	END GENERATE;
END;