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[/] [usbhostslave/] [trunk/] [RTL/] [hostController/] [directcontrol.v] - Rev 5
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////////////////////////////////////////////////////////////////////// //// //// //// directControl //// //// //// This file is part of the usbhostslave opencores effort. //// http://www.opencores.org/cores/usbhostslave/ //// //// //// //// Module Description: //// //// //// //// //// To Do: //// //// //// //// //// Author(s): //// //// - Steve Fielding, sfielding@base2designs.com //// //// //// ////////////////////////////////////////////////////////////////////// //// //// //// Copyright (C) 2004 Steve Fielding and OPENCORES.ORG //// //// //// //// This source file may be used and distributed without //// //// restriction provided that this copyright statement is not //// //// removed from the file and that any derivative work contains //// //// the original copyright notice and the associated disclaimer. //// //// //// //// This source file is free software; you can redistribute it //// //// and/or modify it under the terms of the GNU Lesser General //// //// Public License as published by the Free Software Foundation; //// //// either version 2.1 of the License, or (at your option) any //// //// later version. //// //// //// //// This source is distributed in the hope that it will be //// //// useful, but WITHOUT ANY WARRANTY; without even the implied //// //// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR //// //// PURPOSE. See the GNU Lesser General Public License for more //// //// details. //// //// //// //// You should have received a copy of the GNU Lesser General //// //// Public License along with this source; if not, download it //// //// from http://www.opencores.org/lgpl.shtml //// //// //// ////////////////////////////////////////////////////////////////////// // // $Id: directcontrol.v,v 1.2 2004-12-18 14:36:09 sfielding Exp $ // // CVS Revision History // // $Log: not supported by cvs2svn $ // `timescale 1ns / 1ps `include "usbSerialInterfaceEngine_h.v" module directControl (clk, directControlEn, directControlLineState, HCTxPortCntl, HCTxPortData, HCTxPortGnt, HCTxPortRdy, HCTxPortReq, HCTxPortWEn, rst); input clk; input directControlEn; input [1:0]directControlLineState; input HCTxPortGnt; input HCTxPortRdy; input rst; output [7:0]HCTxPortCntl; output [7:0]HCTxPortData; output HCTxPortReq; output HCTxPortWEn; wire clk; wire directControlEn; wire [1:0]directControlLineState; reg [7:0]HCTxPortCntl, next_HCTxPortCntl; reg [7:0]HCTxPortData, next_HCTxPortData; wire HCTxPortGnt; wire HCTxPortRdy; reg HCTxPortReq, next_HCTxPortReq; reg HCTxPortWEn, next_HCTxPortWEn; wire rst; // BINARY ENCODED state machine: drctCntl // State codes definitions: `define START_DC 3'b000 `define CHK_DRCT_CNTL 3'b001 `define DRCT_CNTL_WAIT_GNT 3'b010 `define DRCT_CNTL_CHK_LOOP 3'b011 `define DRCT_CNTL_WAIT_RDY 3'b100 `define IDLE_FIN 3'b101 `define IDLE_WAIT_GNT 3'b110 `define IDLE_WAIT_RDY 3'b111 reg [2:0]CurrState_drctCntl, NextState_drctCntl; // Diagram actions (continuous assignments allowed only: assign ...) // diagram ACTION // Machine: drctCntl // NextState logic (combinatorial) always @ (directControlEn or HCTxPortGnt or HCTxPortRdy or directControlLineState or HCTxPortCntl or HCTxPortData or HCTxPortWEn or HCTxPortReq or CurrState_drctCntl) begin NextState_drctCntl <= CurrState_drctCntl; // Set default values for outputs and signals next_HCTxPortCntl <= HCTxPortCntl; next_HCTxPortData <= HCTxPortData; next_HCTxPortWEn <= HCTxPortWEn; next_HCTxPortReq <= HCTxPortReq; case (CurrState_drctCntl) // synopsys parallel_case full_case `START_DC: begin NextState_drctCntl <= `CHK_DRCT_CNTL; end `CHK_DRCT_CNTL: begin if (directControlEn == 1'b1) begin NextState_drctCntl <= `DRCT_CNTL_WAIT_GNT; next_HCTxPortReq <= 1'b1; end else begin NextState_drctCntl <= `IDLE_WAIT_GNT; next_HCTxPortReq <= 1'b1; end end `DRCT_CNTL_WAIT_GNT: begin if (HCTxPortGnt == 1'b1) begin NextState_drctCntl <= `DRCT_CNTL_WAIT_RDY; end end `DRCT_CNTL_CHK_LOOP: begin next_HCTxPortWEn <= 1'b0; if (directControlEn == 1'b0) begin NextState_drctCntl <= `CHK_DRCT_CNTL; next_HCTxPortReq <= 1'b0; end else begin NextState_drctCntl <= `DRCT_CNTL_WAIT_RDY; end end `DRCT_CNTL_WAIT_RDY: begin if (HCTxPortRdy == 1'b1) begin NextState_drctCntl <= `DRCT_CNTL_CHK_LOOP; next_HCTxPortWEn <= 1'b1; next_HCTxPortData <= {6'b000000, directControlLineState}; next_HCTxPortCntl <= `TX_DIRECT_CONTROL; end end `IDLE_FIN: begin next_HCTxPortWEn <= 1'b0; next_HCTxPortReq <= 1'b0; NextState_drctCntl <= `CHK_DRCT_CNTL; end `IDLE_WAIT_GNT: begin if (HCTxPortGnt == 1'b1) begin NextState_drctCntl <= `IDLE_WAIT_RDY; end end `IDLE_WAIT_RDY: begin if (HCTxPortRdy == 1'b1) begin NextState_drctCntl <= `IDLE_FIN; next_HCTxPortWEn <= 1'b1; next_HCTxPortData <= 8'h00; next_HCTxPortCntl <= `TX_IDLE; end end endcase end // Current State Logic (sequential) always @ (posedge clk) begin if (rst) CurrState_drctCntl <= `START_DC; else CurrState_drctCntl <= NextState_drctCntl; end // Registered outputs logic always @ (posedge clk) begin if (rst) begin HCTxPortCntl <= 8'h00; HCTxPortData <= 8'h00; HCTxPortWEn <= 1'b0; HCTxPortReq <= 1'b0; end else begin HCTxPortCntl <= next_HCTxPortCntl; HCTxPortData <= next_HCTxPortData; HCTxPortWEn <= next_HCTxPortWEn; HCTxPortReq <= next_HCTxPortReq; end end endmodule
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