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[/] [usbhostslave/] [trunk/] [usbDevice/] [syn/] [Actel/] [usbDeviceActelTop/] [hdl/] [EP1Mouse.v] - Rev 40
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////////////////////////////////////////////////////////////////////// //// //// //// EP1Mouse.v //// //// //// //// This file is part of the usbHostSlave opencores effort. //// <http://www.opencores.org/cores//> //// //// //// //// Module Description: //// //// Implements EP1 as a IN endpoint //// simulating a mouse (a broken one) by //// responding to IN requests with a constant (x,y) <= (1,1) //// which causes the mouse pointer to move from //// top left to bottom right of the screen //// //// //// To Do: //// //// //// //// //// Author(s): //// //// - Steve Fielding, sfielding@base2designs.com //// //// //// ////////////////////////////////////////////////////////////////////// //// //// //// Copyright (C) 2008 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> //// //// //// ////////////////////////////////////////////////////////////////////// // `include "timescale.v" `include "usbHostSlaveReg_define.v" module EP1Mouse (clk, initComplete, rst, wb_ack, wb_addr, wb_data_i, wb_data_o, wb_stb, wb_we, wbBusGnt, wbBusReq); input clk; input initComplete; input rst; input wb_ack; input [7:0]wb_data_i; input wbBusGnt; output [7:0]wb_addr; output [7:0]wb_data_o; output wb_stb; output wb_we; output wbBusReq; wire clk; wire initComplete; wire rst; wire wb_ack; reg [7:0]wb_addr, next_wb_addr; wire [7:0]wb_data_i; reg [7:0]wb_data_o, next_wb_data_o; reg wb_stb, next_wb_stb; reg wb_we, next_wb_we; wire wbBusGnt; reg wbBusReq, next_wbBusReq; // diagram signals declarations reg [7:0]cnt, next_cnt; reg dataSeq, next_dataSeq; reg localRst, next_localRst; reg transDone, next_transDone; // BINARY ENCODED state machine: EP1St // State codes definitions: `define DO_TRANS_WT_GNT 4'b0000 `define DO_TRANS_TX_EMPTY 4'b0001 `define DO_TRANS_WR_TX_FIFO1 4'b0010 `define DO_TRANS_TRANS_GO 4'b0011 `define DO_TRANS_WT_TRANS_DONE_WT_GNT 4'b0100 `define DO_TRANS_WT_TRANS_DONE_GET_RDY_STS 4'b0101 `define DO_TRANS_WT_TRANS_DONE_WT_UNGNT 4'b0110 `define DO_TRANS_WT_TRANS_DONE_CHK_DONE 4'b0111 `define START 4'b1000 `define DO_TRANS_WR_TX_FIFO2 4'b1001 `define DO_TRANS_WR_TX_FIFO3 4'b1010 `define DO_TRANS_WT_TRANS_DONE_DEL 4'b1011 reg [3:0]CurrState_EP1St, NextState_EP1St; // Diagram actions (continuous assignments allowed only: assign ...) // diagram ACTION // Machine: EP1St // NextState logic (combinatorial) always @ (wbBusGnt or wb_ack or wb_data_i or transDone or initComplete or cnt or wbBusReq or wb_addr or wb_data_o or wb_stb or wb_we or dataSeq or CurrState_EP1St) begin NextState_EP1St <= CurrState_EP1St; // Set default values for outputs and signals next_wbBusReq <= wbBusReq; next_wb_addr <= wb_addr; next_wb_data_o <= wb_data_o; next_wb_stb <= wb_stb; next_wb_we <= wb_we; next_dataSeq <= dataSeq; next_transDone <= transDone; next_cnt <= cnt; case (CurrState_EP1St) // synopsys parallel_case full_case `START: begin next_wbBusReq <= 1'b0; next_wb_addr <= 8'h00; next_wb_data_o <= 8'h00; next_wb_stb <= 1'b0; next_wb_we <= 1'b0; next_cnt <= 8'h00; next_dataSeq <= 1'b0; next_transDone <= 1'b0; if (initComplete == 1'b1) begin NextState_EP1St <= `DO_TRANS_WT_GNT; end end `DO_TRANS_WT_GNT: begin next_wbBusReq <= 1'b1; if (wbBusGnt == 1'b1) begin NextState_EP1St <= `DO_TRANS_TX_EMPTY; end end `DO_TRANS_TX_EMPTY: begin next_wb_addr <= `RA_EP1_TX_FIFO_CONTROL_REG; next_wb_data_o <= 8'h01; //force tx fifo empty next_wb_stb <= 1'b1; next_wb_we <= 1'b1; if (wb_ack == 1'b1) begin NextState_EP1St <= `DO_TRANS_WR_TX_FIFO1; next_wb_stb <= 1'b0; next_wb_addr <= `RA_EP1_TX_FIFO_DATA_REG; next_wb_we <= 1'b1; end end `DO_TRANS_WR_TX_FIFO1: begin next_wb_data_o <= 8'h00; next_wb_stb <= 1'b1; if (wb_ack == 1'b1) begin NextState_EP1St <= `DO_TRANS_WR_TX_FIFO2; next_wb_stb <= 1'b0; end end `DO_TRANS_TRANS_GO: begin next_wb_addr <= `RA_EP1_CONTROL_REG; if (dataSeq == 1'b1) next_wb_data_o <= 8'h07; else next_wb_data_o <= 8'h03; next_wb_stb <= 1'b1; next_wb_we <= 1'b1; if (wb_ack == 1'b1) begin NextState_EP1St <= `DO_TRANS_WT_TRANS_DONE_WT_GNT; next_wb_stb <= 1'b0; if (dataSeq == 1'b1) next_dataSeq <= 1'b0; else next_dataSeq <= 1'b1; next_transDone <= 1'b0; end end `DO_TRANS_WR_TX_FIFO2: begin next_wb_data_o <= 8'h01; next_wb_stb <= 1'b1; if (wb_ack == 1'b1) begin NextState_EP1St <= `DO_TRANS_WR_TX_FIFO3; next_wb_stb <= 1'b0; end end `DO_TRANS_WR_TX_FIFO3: begin next_wb_data_o <= 8'h01; next_wb_stb <= 1'b1; if (wb_ack == 1'b1) begin NextState_EP1St <= `DO_TRANS_TRANS_GO; next_wb_stb <= 1'b0; end end `DO_TRANS_WT_TRANS_DONE_WT_GNT: begin next_wbBusReq <= 1'b1; if (wbBusGnt == 1'b1) begin NextState_EP1St <= `DO_TRANS_WT_TRANS_DONE_GET_RDY_STS; end end `DO_TRANS_WT_TRANS_DONE_GET_RDY_STS: begin next_wb_addr <= `RA_EP1_CONTROL_REG; next_wb_stb <= 1'b1; next_wb_we <= 1'b0; if (wb_ack == 1'b1) begin NextState_EP1St <= `DO_TRANS_WT_TRANS_DONE_WT_UNGNT; next_wb_stb <= 1'b0; next_transDone <= ~wb_data_i[`ENDPOINT_READY_BIT]; end end `DO_TRANS_WT_TRANS_DONE_WT_UNGNT: begin next_wbBusReq <= 1'b0; if (wbBusGnt == 1'b0) begin NextState_EP1St <= `DO_TRANS_WT_TRANS_DONE_CHK_DONE; end end `DO_TRANS_WT_TRANS_DONE_CHK_DONE: begin if (transDone == 1'b1) begin NextState_EP1St <= `DO_TRANS_WT_GNT; end else begin NextState_EP1St <= `DO_TRANS_WT_TRANS_DONE_DEL; next_cnt <= 8'h00; end end `DO_TRANS_WT_TRANS_DONE_DEL: begin next_cnt <= cnt + 1'b1; if (cnt == `ONE_USEC_DEL) begin NextState_EP1St <= `DO_TRANS_WT_TRANS_DONE_WT_GNT; end end endcase end // Current State Logic (sequential) always @ (posedge clk) begin if (rst == 1'b1) CurrState_EP1St <= `START; else CurrState_EP1St <= NextState_EP1St; end // Registered outputs logic always @ (posedge clk) begin if (rst == 1'b1) begin wbBusReq <= 1'b0; wb_addr <= 8'h00; wb_data_o <= 8'h00; wb_stb <= 1'b0; wb_we <= 1'b0; dataSeq <= 1'b0; transDone <= 1'b0; cnt <= 8'h00; end else begin wbBusReq <= next_wbBusReq; wb_addr <= next_wb_addr; wb_data_o <= next_wb_data_o; wb_stb <= next_wb_stb; wb_we <= next_wb_we; dataSeq <= next_dataSeq; transDone <= next_transDone; cnt <= next_cnt; end end endmodule