/* 
 *	 pkt_gen.v
 *
 *	 Copyright (C) 2026 Private Island Networks Inc.
 *
 *   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.
 *
 *	function: programmable packet generator
 *
 *	see https://privateisland.tech/dev/pi-pkt-gen
 *	 
 */
 
module pkt_gen #(parameter DEPTH = 8, parameter DATAW = 16)
(
	input	rstn,
	input	pclk,
	
	// controller interface
	input  	cont_clk,
	input   cont_sel,
	input 	cont_we,
	input 	[$clog2(DEPTH)-1:0] cont_addr,
	input 	[DATAW-1:0]	cont_d_i,
	output reg [DATAW-1:0] cont_d_o,
	output cont_tgt_ready,
	
	// switch interface
	output fifo_empty_o,
	input fifo_re,
	output [8:0] fifo_d_o,
	output [10:0] byte_cnt
);

	/*** local params ***/
	
	localparam PKT_GEN_ENABLE_ADDR = 'h0;

	/*** variables ***/
	reg pkt_gen_en;

	/*** logic ***/

	// mle_enable: enable / disable the MLE
	always @(posedge cont_clk, negedge rstn)
		if (!rstn)
			pkt_gen_en <= 1'b0;
		else if (cont_we && cont_sel && cont_addr == PKT_GEN_ENABLE_ADDR)
			pkt_gen_en <= cont_d_i[0];
			
	// Controller Read Data Mux
	always @(posedge cont_clk, negedge rstn)
		if (!rstn)
			cont_d_o <= 16'hcccc;
		else
			case (cont_addr)
				PKT_GEN_ENABLE_ADDR: cont_d_o <=  pkt_gen_en;
				default: cont_d_o <= cont_d_o;
			endcase	
			
	// tie offs for now
	assign cont_tgt_ready = 1'b1;
	assign fifo_empty_o = 1'b0;
	assign fifo_d_o = 9'h1ff;
	assign byte_cnt = 'd0;
	
	
		
endmodule