// Copyright (C) 2020-2021  The SymbiFlow Authors.
//
// Use of this source code is governed by a ISC-style
// license that can be found in the LICENSE file or at
// https://opensource.org/licenses/ISC
//
// SPDX-License-Identifier:ISC

module sram1024x18 (
	clk_a,
	cen_a,
	wen_a,
	addr_a,
	wmsk_a,
	wdata_a,
	rdata_a,
	clk_b,
	cen_b,
	wen_b,
	addr_b,
	wmsk_b,
	wdata_b,
	rdata_b
);
	input wire clk_a;
	input wire cen_a;
	input wire wen_a;
	input wire [9:0] addr_a;
	input wire [17:0] wmsk_a;
	input wire [17:0] wdata_a;
	output reg [17:0] rdata_a;
	input wire clk_b;
	input wire cen_b;
	input wire wen_b;
	input wire [9:0] addr_b;
	input wire [17:0] wmsk_b;
	input wire [17:0] wdata_b;
	output reg [17:0] rdata_b;
	reg [17:0] ram [1023:0];
	reg [9:0] laddr_a;
	reg [9:0] laddr_b;
	reg lcen_a;
	reg lwen_a;
	reg [17:0] lwdata_a;
	reg lcen_b;
	reg lwen_b;
	reg [17:0] lwdata_b;
	reg [17:0] lwmsk_a;
	reg [17:0] lwmsk_b;
	always @(posedge clk_a) begin
		laddr_a <= addr_a;
		lwdata_a <= wdata_a;
		lwmsk_a <= wmsk_a;
		lcen_a <= cen_a;
		lwen_a <= wen_a;
	end
	always @(posedge clk_b) begin
		laddr_b <= addr_b;
		lwdata_b <= wdata_b;
		lwmsk_b <= wmsk_b;
		lcen_b <= cen_b;
		lwen_b <= wen_b;
	end
	always @(*) begin
		if ((lwen_b == 0) && (lcen_b == 0)) begin
			ram[laddr_b][0] = (lwmsk_b[0] ? ram[laddr_b][0] : lwdata_b[0]);
			ram[laddr_b][1] = (lwmsk_b[1] ? ram[laddr_b][1] : lwdata_b[1]);
			ram[laddr_b][2] = (lwmsk_b[2] ? ram[laddr_b][2] : lwdata_b[2]);
			ram[laddr_b][3] = (lwmsk_b[3] ? ram[laddr_b][3] : lwdata_b[3]);
			ram[laddr_b][4] = (lwmsk_b[4] ? ram[laddr_b][4] : lwdata_b[4]);
			ram[laddr_b][5] = (lwmsk_b[5] ? ram[laddr_b][5] : lwdata_b[5]);
			ram[laddr_b][6] = (lwmsk_b[6] ? ram[laddr_b][6] : lwdata_b[6]);
			ram[laddr_b][7] = (lwmsk_b[7] ? ram[laddr_b][7] : lwdata_b[7]);
			ram[laddr_b][8] = (lwmsk_b[8] ? ram[laddr_b][8] : lwdata_b[8]);
			ram[laddr_b][9] = (lwmsk_b[9] ? ram[laddr_b][9] : lwdata_b[9]);
			ram[laddr_b][10] = (lwmsk_b[10] ? ram[laddr_b][10] : lwdata_b[10]);
			ram[laddr_b][11] = (lwmsk_b[11] ? ram[laddr_b][11] : lwdata_b[11]);
			ram[laddr_b][12] = (lwmsk_b[12] ? ram[laddr_b][12] : lwdata_b[12]);
			ram[laddr_b][13] = (lwmsk_b[13] ? ram[laddr_b][13] : lwdata_b[13]);
			ram[laddr_b][14] = (lwmsk_b[14] ? ram[laddr_b][14] : lwdata_b[14]);
			ram[laddr_b][15] = (lwmsk_b[15] ? ram[laddr_b][15] : lwdata_b[15]);
			ram[laddr_b][16] = (lwmsk_b[16] ? ram[laddr_b][16] : lwdata_b[16]);
			ram[laddr_b][17] = (lwmsk_b[17] ? ram[laddr_b][17] : lwdata_b[17]);
			lwen_b = 1;
		end
		if (lcen_b == 0) begin
			rdata_b = ram[laddr_b];
			lcen_b = 1;
		end
		else
			rdata_b = rdata_b;
	end
	always @(*) begin
		if ((lwen_a == 0) && (lcen_a == 0)) begin
			ram[laddr_a][0] = (lwmsk_a[0] ? ram[laddr_a][0] : lwdata_a[0]);
			ram[laddr_a][1] = (lwmsk_a[1] ? ram[laddr_a][1] : lwdata_a[1]);
			ram[laddr_a][2] = (lwmsk_a[2] ? ram[laddr_a][2] : lwdata_a[2]);
			ram[laddr_a][3] = (lwmsk_a[3] ? ram[laddr_a][3] : lwdata_a[3]);
			ram[laddr_a][4] = (lwmsk_a[4] ? ram[laddr_a][4] : lwdata_a[4]);
			ram[laddr_a][5] = (lwmsk_a[5] ? ram[laddr_a][5] : lwdata_a[5]);
			ram[laddr_a][6] = (lwmsk_a[6] ? ram[laddr_a][6] : lwdata_a[6]);
			ram[laddr_a][7] = (lwmsk_a[7] ? ram[laddr_a][7] : lwdata_a[7]);
			ram[laddr_a][8] = (lwmsk_a[8] ? ram[laddr_a][8] : lwdata_a[8]);
			ram[laddr_a][9] = (lwmsk_a[9] ? ram[laddr_a][9] : lwdata_a[9]);
			ram[laddr_a][10] = (lwmsk_a[10] ? ram[laddr_a][10] : lwdata_a[10]);
			ram[laddr_a][11] = (lwmsk_a[11] ? ram[laddr_a][11] : lwdata_a[11]);
			ram[laddr_a][12] = (lwmsk_a[12] ? ram[laddr_a][12] : lwdata_a[12]);
			ram[laddr_a][13] = (lwmsk_a[13] ? ram[laddr_a][13] : lwdata_a[13]);
			ram[laddr_a][14] = (lwmsk_a[14] ? ram[laddr_a][14] : lwdata_a[14]);
			ram[laddr_a][15] = (lwmsk_a[15] ? ram[laddr_a][15] : lwdata_a[15]);
			ram[laddr_a][16] = (lwmsk_a[16] ? ram[laddr_a][16] : lwdata_a[16]);
			ram[laddr_a][17] = (lwmsk_a[17] ? ram[laddr_a][17] : lwdata_a[17]);
			lwen_a = 1;
		end
		if (lcen_a == 0) begin
			rdata_a = ram[laddr_a];
			lcen_a = 1;
		end
		else
			rdata_a = rdata_a;
	end
endmodule