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[/] [usbhostslave/] [tags/] [rel_00_07_alpha/] [RTL/] [hostController/] [sendpacket.v] - Rev 14
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////////////////////////////////////////////////////////////////////// //// //// //// sendPacket //// //// //// 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 //// //// //// ////////////////////////////////////////////////////////////////////// // `timescale 1ns / 1ps `include "usbSerialInterfaceEngine_h.v" `include "usbConstants_h.v" module sendPacket (clk, fifoData, fifoEmpty, fifoReadEn, frameNum, fullSpeedPolarity, HCTxPortCntl, HCTxPortData, HCTxPortGnt, HCTxPortRdy, HCTxPortReq, HCTxPortWEn, PID, rst, sendPacketRdy, sendPacketWEn, TxAddr, TxEndP); input clk; input [7:0]fifoData; input fifoEmpty; input fullSpeedPolarity; input HCTxPortGnt; input HCTxPortRdy; input [3:0]PID; input rst; input sendPacketWEn; input [6:0]TxAddr; input [3:0]TxEndP; output fifoReadEn; output [10:0]frameNum; output [7:0]HCTxPortCntl; output [7:0]HCTxPortData; output HCTxPortReq; output HCTxPortWEn; output sendPacketRdy; wire clk; wire [7:0]fifoData; wire fifoEmpty; reg fifoReadEn, next_fifoReadEn; reg [10:0]frameNum, next_frameNum; wire fullSpeedPolarity; 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 [3:0]PID; wire rst; reg sendPacketRdy, next_sendPacketRdy; wire sendPacketWEn; wire [6:0]TxAddr; wire [3:0]TxEndP; // diagram signals declarations reg [7:0]PIDNotPID; // BINARY ENCODED state machine: sndPkt // State codes definitions: `define START_SP 5'b00000 `define WAIT_ENABLE 5'b00001 `define SP_WAIT_GNT 5'b00010 `define SEND_PID_WAIT_RDY 5'b00011 `define SEND_PID_FIN 5'b00100 `define FIN_SP 5'b00101 `define OUT_IN_SETUP_WAIT_RDY1 5'b00110 `define OUT_IN_SETUP_WAIT_RDY2 5'b00111 `define OUT_IN_SETUP_FIN 5'b01000 `define SEND_SOF_FIN1 5'b01001 `define SEND_SOF_WAIT_RDY3 5'b01010 `define SEND_SOF_WAIT_RDY4 5'b01011 `define DATA0_DATA1_READ_FIFO 5'b01100 `define DATA0_DATA1_WAIT_READ_FIFO 5'b01101 `define DATA0_DATA1_FIFO_EMPTY 5'b01110 `define DATA0_DATA1_FIN 5'b01111 `define DATA0_DATA1_TERM_BYTE 5'b10000 `define OUT_IN_SETUP_CLR_WEN1 5'b10001 `define SEND_SOF_CLR_WEN1 5'b10010 `define DATA0_DATA1_CLR_WEN 5'b10011 `define DATA0_DATA1_CLR_REN 5'b10100 `define LS_EOP_WAIT_RDY 5'b10101 `define LS_EOP_FIN 5'b10110 reg [4:0]CurrState_sndPkt, NextState_sndPkt; // Diagram actions (continuous assignments allowed only: assign ...) always @(PID) begin PIDNotPID <= { (PID ^ 4'hf), PID }; end // Machine: sndPkt // NextState logic (combinatorial) always @ (sendPacketWEn or HCTxPortGnt or fullSpeedPolarity or HCTxPortRdy or PIDNotPID or PID or TxEndP or TxAddr or frameNum or fifoData or fifoEmpty or sendPacketRdy or fifoReadEn or HCTxPortData or HCTxPortCntl or HCTxPortWEn or HCTxPortReq or CurrState_sndPkt) begin NextState_sndPkt <= CurrState_sndPkt; // Set default values for outputs and signals next_sendPacketRdy <= sendPacketRdy; next_fifoReadEn <= fifoReadEn; next_HCTxPortData <= HCTxPortData; next_HCTxPortCntl <= HCTxPortCntl; next_HCTxPortWEn <= HCTxPortWEn; next_HCTxPortReq <= HCTxPortReq; next_frameNum <= frameNum; case (CurrState_sndPkt) // synopsys parallel_case full_case `START_SP: begin NextState_sndPkt <= `WAIT_ENABLE; end `WAIT_ENABLE: begin if (sendPacketWEn == 1'b1) begin NextState_sndPkt <= `SP_WAIT_GNT; next_sendPacketRdy <= 1'b0; next_HCTxPortReq <= 1'b1; end end `SP_WAIT_GNT: begin if ((HCTxPortGnt == 1'b1) && (PID == `SOF && fullSpeedPolarity == 1'b0)) begin NextState_sndPkt <= `LS_EOP_WAIT_RDY; end else if (HCTxPortGnt == 1'b1) begin NextState_sndPkt <= `SEND_PID_WAIT_RDY; end end `FIN_SP: begin NextState_sndPkt <= `WAIT_ENABLE; next_sendPacketRdy <= 1'b1; next_HCTxPortReq <= 1'b0; end `SEND_PID_WAIT_RDY: begin if (HCTxPortRdy == 1'b1) begin NextState_sndPkt <= `SEND_PID_FIN; next_HCTxPortWEn <= 1'b1; next_HCTxPortData <= PIDNotPID; next_HCTxPortCntl <= `TX_PACKET_START; end end `SEND_PID_FIN: begin next_HCTxPortWEn <= 1'b0; if (PID == `DATA0 || PID == `DATA1) begin NextState_sndPkt <= `DATA0_DATA1_FIFO_EMPTY; end else if (PID == `SOF) begin NextState_sndPkt <= `SEND_SOF_WAIT_RDY3; end else if (PID == `OUT || PID == `IN || PID == `SETUP) begin NextState_sndPkt <= `OUT_IN_SETUP_WAIT_RDY1; end else begin NextState_sndPkt <= `FIN_SP; end end `OUT_IN_SETUP_WAIT_RDY1: begin if (HCTxPortRdy == 1'b1) begin NextState_sndPkt <= `OUT_IN_SETUP_CLR_WEN1; next_HCTxPortWEn <= 1'b1; next_HCTxPortData <= {TxEndP[0], TxAddr[6:0]}; next_HCTxPortCntl <= `TX_PACKET_STREAM; end end `OUT_IN_SETUP_WAIT_RDY2: begin if (HCTxPortRdy == 1'b1) begin NextState_sndPkt <= `OUT_IN_SETUP_FIN; next_HCTxPortWEn <= 1'b1; next_HCTxPortData <= {5'b00000, TxEndP[3:1]}; next_HCTxPortCntl <= `TX_PACKET_STREAM; end end `OUT_IN_SETUP_FIN: begin next_HCTxPortWEn <= 1'b0; NextState_sndPkt <= `FIN_SP; end `OUT_IN_SETUP_CLR_WEN1: begin next_HCTxPortWEn <= 1'b0; NextState_sndPkt <= `OUT_IN_SETUP_WAIT_RDY2; end `SEND_SOF_FIN1: begin next_HCTxPortWEn <= 1'b0; next_frameNum <= frameNum + 1'b1; NextState_sndPkt <= `FIN_SP; end `SEND_SOF_WAIT_RDY3: begin if (HCTxPortRdy == 1'b1) begin NextState_sndPkt <= `SEND_SOF_CLR_WEN1; next_HCTxPortWEn <= 1'b1; next_HCTxPortData <= frameNum[7:0]; next_HCTxPortCntl <= `TX_PACKET_STREAM; end end `SEND_SOF_WAIT_RDY4: begin if (HCTxPortRdy == 1'b1) begin NextState_sndPkt <= `SEND_SOF_FIN1; next_HCTxPortWEn <= 1'b1; next_HCTxPortData <= {5'b00000, frameNum[10:8]}; next_HCTxPortCntl <= `TX_PACKET_STREAM; end end `SEND_SOF_CLR_WEN1: begin next_HCTxPortWEn <= 1'b0; NextState_sndPkt <= `SEND_SOF_WAIT_RDY4; end `DATA0_DATA1_READ_FIFO: begin next_HCTxPortWEn <= 1'b1; next_HCTxPortData <= fifoData; next_HCTxPortCntl <= `TX_PACKET_STREAM; NextState_sndPkt <= `DATA0_DATA1_CLR_WEN; end `DATA0_DATA1_WAIT_READ_FIFO: begin if (HCTxPortRdy == 1'b1) begin NextState_sndPkt <= `DATA0_DATA1_CLR_REN; next_fifoReadEn <= 1'b1; end end `DATA0_DATA1_FIFO_EMPTY: begin if (fifoEmpty == 1'b0) begin NextState_sndPkt <= `DATA0_DATA1_WAIT_READ_FIFO; end else begin NextState_sndPkt <= `DATA0_DATA1_TERM_BYTE; end end `DATA0_DATA1_FIN: begin next_HCTxPortWEn <= 1'b0; NextState_sndPkt <= `FIN_SP; end `DATA0_DATA1_TERM_BYTE: begin if (HCTxPortRdy == 1'b1) begin NextState_sndPkt <= `DATA0_DATA1_FIN; //Last byte is not valid data, //but the 'TX_PACKET_STOP' flag is required //by the SIE state machine to detect end of data packet next_HCTxPortWEn <= 1'b1; next_HCTxPortData <= 8'h00; next_HCTxPortCntl <= `TX_PACKET_STOP; end end `DATA0_DATA1_CLR_WEN: begin next_HCTxPortWEn <= 1'b0; NextState_sndPkt <= `DATA0_DATA1_FIFO_EMPTY; end `DATA0_DATA1_CLR_REN: begin next_fifoReadEn <= 1'b0; NextState_sndPkt <= `DATA0_DATA1_READ_FIFO; end `LS_EOP_WAIT_RDY: begin if (HCTxPortRdy == 1'b1) begin NextState_sndPkt <= `LS_EOP_FIN; next_HCTxPortWEn <= 1'b1; next_HCTxPortData <= 8'h00; next_HCTxPortCntl <= `TX_LS_KEEP_ALIVE; end end `LS_EOP_FIN: begin next_HCTxPortWEn <= 1'b0; NextState_sndPkt <= `FIN_SP; end endcase end // Current State Logic (sequential) always @ (posedge clk) begin if (rst) CurrState_sndPkt <= `START_SP; else CurrState_sndPkt <= NextState_sndPkt; end // Registered outputs logic always @ (posedge clk) begin if (rst) begin sendPacketRdy <= 1'b1; fifoReadEn <= 1'b0; HCTxPortData <= 8'h00; HCTxPortCntl <= 8'h00; HCTxPortWEn <= 1'b0; HCTxPortReq <= 1'b0; frameNum <= 11'h000; end else begin sendPacketRdy <= next_sendPacketRdy; fifoReadEn <= next_fifoReadEn; HCTxPortData <= next_HCTxPortData; HCTxPortCntl <= next_HCTxPortCntl; HCTxPortWEn <= next_HCTxPortWEn; HCTxPortReq <= next_HCTxPortReq; frameNum <= next_frameNum; end end endmodule
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