Help me about SRAM 512k on boardDE2.

Build an user defined component using this code:

module	SRAM_16Bit_512K
(	// Host Data
	oDATA,iDATA,iADDR,
	iWE_N,iOE_N,
	iCE_N,iCLK,
	iBE_N,
	// SRAM
	SRAM_DQ,
	SRAM_ADDR,
	SRAM_UB_N,
	SRAM_LB_N,
	SRAM_WE_N,
	SRAM_CE_N,
	SRAM_OE_N
);
//	Host Side
input		iDATA;
output		oDATA;
input		iADDR;
input		iWE_N,iOE_N;
input		iCE_N,iCLK;
input		iBE_N;
//	SRAM Side
inout		SRAM_DQ;
output		SRAM_ADDR;
output		SRAM_UB_N,
		SRAM_LB_N,
		SRAM_WE_N,
		SRAM_CE_N,
		SRAM_OE_N;
assign	SRAM_DQ 		=	SRAM_WE_N ? 16'hzzzz : iDATA;
assign	oDATA		=	SRAM_DQ;
assign	SRAM_ADDR	=	iADDR;
assign	SRAM_WE_N	=	iWE_N;
assign	SRAM_OE_N	=	iOE_N;
assign	SRAM_CE_N	=	iCE_N;
assign	SRAM_UB_N	=	iBE_N;
assign	SRAM_LB_N	=	iBE_N;
endmodule