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https://opencores.org/ocsvn/usbhostslave/usbhostslave/trunk
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[/] [usbhostslave/] [tags/] [rel_00_07_alpha/] [RTL/] [hostController/] [softransmit.v] - Rev 5
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////////////////////////////////////////////////////////////////////// //// //// //// softransmit //// //// //// 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: softransmit.v,v 1.2 2004-12-18 14:36:11 sfielding Exp $ // // CVS Revision History // // $Log: not supported by cvs2svn $ // `timescale 1ns / 1ps `include "usbHostControl_h.v" module SOFTransmit (clk, rst, sendPacketArbiterGnt, sendPacketArbiterReq, sendPacketRdy, sendPacketWEn, SOFEnable, SOFSent, SOFSyncEn, SOFTimer, SOFTimerClr); input clk; input rst; input sendPacketArbiterGnt; input sendPacketRdy; input SOFEnable; // After host software asserts SOFEnable, must wait TBD time before asserting SOFSyncEn input SOFSyncEn; input [15:0]SOFTimer; output sendPacketArbiterReq; output sendPacketWEn; output SOFSent; // single cycle pulse output SOFTimerClr; // Single cycle pulse wire clk; wire rst; wire sendPacketArbiterGnt; reg sendPacketArbiterReq, next_sendPacketArbiterReq; wire sendPacketRdy; reg sendPacketWEn, next_sendPacketWEn; wire SOFEnable; reg SOFSent, next_SOFSent; wire SOFSyncEn; wire [15:0]SOFTimer; reg SOFTimerClr, next_SOFTimerClr; // BINARY ENCODED state machine: SOFTx // State codes definitions: `define START_STX 3'b000 `define WAIT_SOF_NEAR 3'b001 `define WAIT_SP_GNT 3'b010 `define WAIT_SOF_NOW 3'b011 `define SOF_FIN 3'b100 reg [2:0]CurrState_SOFTx, NextState_SOFTx; // Machine: SOFTx // NextState logic (combinatorial) always @ (SOFTimer or SOFSyncEn or SOFEnable or sendPacketArbiterGnt or sendPacketRdy or SOFSent or SOFTimerClr or sendPacketArbiterReq or sendPacketWEn or CurrState_SOFTx) begin NextState_SOFTx <= CurrState_SOFTx; // Set default values for outputs and signals next_SOFSent <= SOFSent; next_SOFTimerClr <= SOFTimerClr; next_sendPacketArbiterReq <= sendPacketArbiterReq; next_sendPacketWEn <= sendPacketWEn; case (CurrState_SOFTx) // synopsys parallel_case full_case `START_STX: begin NextState_SOFTx <= `WAIT_SOF_NEAR; end `WAIT_SOF_NEAR: begin if (SOFTimer >= `SOF_TX_TIME - `SOF_TX_MARGIN || (SOFSyncEn == 1'b1 && SOFEnable == 1'b1)) begin NextState_SOFTx <= `WAIT_SP_GNT; next_sendPacketArbiterReq <= 1'b1; end end `WAIT_SP_GNT: begin if (sendPacketArbiterGnt == 1'b1 && sendPacketRdy == 1'b1) begin NextState_SOFTx <= `WAIT_SOF_NOW; end end `WAIT_SOF_NOW: begin if (SOFTimer >= `SOF_TX_TIME) begin NextState_SOFTx <= `SOF_FIN; next_sendPacketWEn <= 1'b1; next_SOFTimerClr <= 1'b1; next_SOFSent <= 1'b1; end else if (SOFEnable == 1'b0) begin NextState_SOFTx <= `SOF_FIN; next_SOFTimerClr <= 1'b1; end end `SOF_FIN: begin next_sendPacketWEn <= 1'b0; next_SOFTimerClr <= 1'b0; next_SOFSent <= 1'b0; NextState_SOFTx <= `WAIT_SOF_NEAR; next_sendPacketArbiterReq <= 1'b0; end endcase end // Current State Logic (sequential) always @ (posedge clk) begin if (rst) CurrState_SOFTx <= `START_STX; else CurrState_SOFTx <= NextState_SOFTx; end // Registered outputs logic always @ (posedge clk) begin if (rst) begin SOFSent <= 1'b0; SOFTimerClr <= 1'b0; sendPacketArbiterReq <= 1'b0; sendPacketWEn <= 1'b0; end else begin SOFSent <= next_SOFSent; SOFTimerClr <= next_SOFTimerClr; sendPacketArbiterReq <= next_sendPacketArbiterReq; sendPacketWEn <= next_sendPacketWEn; end end endmodule
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