// SPDX-FileCopyrightText: 2022 Wuhan University of Technology
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// SPDX-License-Identifier: Apache-2.0

`timescale 1 ns / 1 ps


module gen_sram #
(
	parameter DW = 32,
	parameter AW = 14
)
(

	input [DW-1:0] data_w,
	input [AW-1:0] addr_w,
	input [(DW+7)/8-1:0] data_wstrb,
	input en_w,


	output [DW-1:0] data_r,
	input [AW-1:0] addr_r,
	input en_r,

	input CLK

);

	localparam DP = 2**AW;
	localparam DW_ZM = (DW+7)/8*8;

	reg [DW_ZM-1:0] ram[0:DP-1];
	reg [DW_ZM-1:0] data_r_reg;
	wire [DW_ZM-1:0] data_w_zmask = {DW_ZM{1'b0}} | data_w;


	generate
		for ( genvar i = 0; i < (DW+7)/8; i = i + 1) begin
			always @(posedge CLK) begin
				if (en_w) begin
					if (data_wstrb[i]) begin
						ram[addr_w][i*8+:8] <= #1 data_w_zmask[i*8+:8] ;					
					end
				end

				if (en_r) begin
					data_r_reg[i*8+:8] <= #1 ram[addr_r][i*8+:8];
				end
			end


		end
	endgenerate
	
	assign data_r = data_r_reg[DW-1:0];


integer i;
initial begin
	for ( i = 0; i < DP; i = i + 1 ) begin
		ram[i] = {((DW+31)/32){$random}};
	end
	
	data_r_reg = {((DW+31)/32){$random}};
end


endmodule