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[/] [usbhostslave/] [trunk/] [RTL/] [hostController/] [getpacket.v] - Rev 20
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////////////////////////////////////////////////////////////////////// //// //// //// getpacket //// //// //// 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 getPacket (clk, getPacketEn, rst, RXDataIn, RXDataValid, RXFifoData, RXFifoFull, RXFifoWEn, RXPacketRdy, RxPID, RXPktStatus, RXStreamStatusIn, SIERxTimeOut, SIERxTimeOutEn); input clk; input getPacketEn; input rst; input [7:0]RXDataIn; input RXDataValid; input RXFifoFull; input [7:0]RXStreamStatusIn; input SIERxTimeOut; // Single cycle pulse output [7:0]RXFifoData; output RXFifoWEn; output RXPacketRdy; output [3:0]RxPID; output [7:0]RXPktStatus; output SIERxTimeOutEn; wire clk; wire getPacketEn; wire rst; wire [7:0]RXDataIn; wire RXDataValid; reg [7:0]RXFifoData, next_RXFifoData; wire RXFifoFull; reg RXFifoWEn, next_RXFifoWEn; reg RXPacketRdy, next_RXPacketRdy; reg [3:0]RxPID, next_RxPID; reg [7:0]RXPktStatus; wire [7:0]RXStreamStatusIn; wire SIERxTimeOut; reg SIERxTimeOutEn, next_SIERxTimeOutEn; // diagram signals declarations reg ACKRxed, next_ACKRxed; reg bitStuffError, next_bitStuffError; reg CRCError, next_CRCError; reg dataSequence, next_dataSequence; reg NAKRxed, next_NAKRxed; reg [7:0]RXByte, next_RXByte; reg [7:0]RXByteOld, next_RXByteOld; reg [7:0]RXByteOldest, next_RXByteOldest; reg RXOverflow, next_RXOverflow; reg [7:0]RXStreamStatus, next_RXStreamStatus; reg RXTimeOut, next_RXTimeOut; reg stallRxed, next_stallRxed; // BINARY ENCODED state machine: getPkt // State codes definitions: `define PROC_PKT_CHK_PID 5'b00000 `define PROC_PKT_HS 5'b00001 `define PROC_PKT_DATA_W_D1 5'b00010 `define PROC_PKT_DATA_CHK_D1 5'b00011 `define PROC_PKT_DATA_W_D2 5'b00100 `define PROC_PKT_DATA_FIN 5'b00101 `define PROC_PKT_DATA_CHK_D2 5'b00110 `define PROC_PKT_DATA_W_D3 5'b00111 `define PROC_PKT_DATA_CHK_D3 5'b01000 `define PROC_PKT_DATA_LOOP_CHK_FIFO 5'b01001 `define PROC_PKT_DATA_LOOP_FIFO_FULL 5'b01010 `define PROC_PKT_DATA_LOOP_W_D 5'b01011 `define START_GP 5'b01100 `define WAIT_PKT 5'b01101 `define CHK_PKT_START 5'b01110 `define WAIT_EN 5'b01111 `define PKT_RDY 5'b10000 `define PROC_PKT_DATA_LOOP_DELAY 5'b10001 reg [4:0]CurrState_getPkt, NextState_getPkt; // Diagram actions (continuous assignments allowed only: assign ...) always @ (CRCError or bitStuffError or RXOverflow or RXTimeOut or NAKRxed or stallRxed or ACKRxed or dataSequence) begin RXPktStatus <= { dataSequence, ACKRxed, stallRxed, NAKRxed, RXTimeOut, RXOverflow, bitStuffError, CRCError}; end // Machine: getPkt // NextState logic (combinatorial) always @ (RXByte or RXDataValid or RXDataIn or RXStreamStatusIn or RXStreamStatus or RXFifoFull or RXByteOldest or RXByteOld or SIERxTimeOut or getPacketEn or RXOverflow or NAKRxed or stallRxed or ACKRxed or CRCError or bitStuffError or dataSequence or RXFifoWEn or RXFifoData or RXPacketRdy or RXTimeOut or RxPID or SIERxTimeOutEn or CurrState_getPkt) begin NextState_getPkt <= CurrState_getPkt; // Set default values for outputs and signals next_RXOverflow <= RXOverflow; next_NAKRxed <= NAKRxed; next_stallRxed <= stallRxed; next_ACKRxed <= ACKRxed; next_RXByte <= RXByte; next_RXStreamStatus <= RXStreamStatus; next_RXByteOldest <= RXByteOldest; next_CRCError <= CRCError; next_bitStuffError <= bitStuffError; next_dataSequence <= dataSequence; next_RXByteOld <= RXByteOld; next_RXFifoWEn <= RXFifoWEn; next_RXFifoData <= RXFifoData; next_RXPacketRdy <= RXPacketRdy; next_RXTimeOut <= RXTimeOut; next_RxPID <= RxPID; next_SIERxTimeOutEn <= SIERxTimeOutEn; case (CurrState_getPkt) // synopsys parallel_case full_case `START_GP: begin NextState_getPkt <= `WAIT_EN; end `WAIT_PKT: begin next_CRCError <= 1'b0; next_bitStuffError <= 1'b0; next_RXOverflow <= 1'b0; next_RXTimeOut <= 1'b0; next_NAKRxed <= 1'b0; next_stallRxed <= 1'b0; next_ACKRxed <= 1'b0; next_dataSequence <= 1'b0; next_SIERxTimeOutEn <= 1'b1; if (SIERxTimeOut == 1'b1) begin NextState_getPkt <= `PKT_RDY; next_RXTimeOut <= 1'b1; end else if (RXDataValid == 1'b1) begin NextState_getPkt <= `CHK_PKT_START; next_RXByte <= RXDataIn; next_RXStreamStatus <= RXStreamStatusIn; end end `CHK_PKT_START: begin if (RXStreamStatus == `RX_PACKET_START) begin NextState_getPkt <= `PROC_PKT_CHK_PID; next_RxPID <= RXByte[3:0]; end else begin NextState_getPkt <= `PKT_RDY; next_RXTimeOut <= 1'b1; end end `WAIT_EN: begin next_RXPacketRdy <= 1'b0; next_SIERxTimeOutEn <= 1'b0; if (getPacketEn == 1'b1) begin NextState_getPkt <= `WAIT_PKT; end end `PKT_RDY: begin next_RXPacketRdy <= 1'b1; NextState_getPkt <= `WAIT_EN; end `PROC_PKT_CHK_PID: begin if (RXByte[1:0] == `HANDSHAKE) begin NextState_getPkt <= `PROC_PKT_HS; end else if (RXByte[1:0] == `DATA) begin NextState_getPkt <= `PROC_PKT_DATA_W_D1; end else begin NextState_getPkt <= `PKT_RDY; end end `PROC_PKT_HS: begin if (RXDataValid == 1'b1) begin NextState_getPkt <= `PKT_RDY; next_RXOverflow <= RXDataIn[`RX_OVERFLOW_BIT]; next_NAKRxed <= RXDataIn[`NAK_RXED_BIT]; next_stallRxed <= RXDataIn[`STALL_RXED_BIT]; next_ACKRxed <= RXDataIn[`ACK_RXED_BIT]; end end `PROC_PKT_DATA_W_D1: begin if (RXDataValid == 1'b1) begin NextState_getPkt <= `PROC_PKT_DATA_CHK_D1; next_RXByte <= RXDataIn; next_RXStreamStatus <= RXStreamStatusIn; end end `PROC_PKT_DATA_CHK_D1: begin if (RXStreamStatus == `RX_PACKET_STREAM) begin NextState_getPkt <= `PROC_PKT_DATA_W_D2; next_RXByteOldest <= RXByte; end else begin NextState_getPkt <= `PROC_PKT_DATA_FIN; end end `PROC_PKT_DATA_W_D2: begin if (RXDataValid == 1'b1) begin NextState_getPkt <= `PROC_PKT_DATA_CHK_D2; next_RXByte <= RXDataIn; next_RXStreamStatus <= RXStreamStatusIn; end end `PROC_PKT_DATA_FIN: begin next_CRCError <= RXByte[`CRC_ERROR_BIT]; next_bitStuffError <= RXByte[`BIT_STUFF_ERROR_BIT]; next_dataSequence <= RXByte[`DATA_SEQUENCE_BIT]; NextState_getPkt <= `PKT_RDY; end `PROC_PKT_DATA_CHK_D2: begin if (RXStreamStatus == `RX_PACKET_STREAM) begin NextState_getPkt <= `PROC_PKT_DATA_W_D3; next_RXByteOld <= RXByte; end else begin NextState_getPkt <= `PROC_PKT_DATA_FIN; end end `PROC_PKT_DATA_W_D3: begin if (RXDataValid == 1'b1) begin NextState_getPkt <= `PROC_PKT_DATA_CHK_D3; next_RXByte <= RXDataIn; next_RXStreamStatus <= RXStreamStatusIn; end end `PROC_PKT_DATA_CHK_D3: begin if (RXStreamStatus == `RX_PACKET_STREAM) begin NextState_getPkt <= `PROC_PKT_DATA_LOOP_CHK_FIFO; end else begin NextState_getPkt <= `PROC_PKT_DATA_FIN; end end `PROC_PKT_DATA_LOOP_CHK_FIFO: begin if (RXFifoFull == 1'b1) begin NextState_getPkt <= `PROC_PKT_DATA_LOOP_FIFO_FULL; next_RXOverflow <= 1'b1; end else begin NextState_getPkt <= `PROC_PKT_DATA_LOOP_W_D; next_RXFifoWEn <= 1'b1; next_RXFifoData <= RXByteOldest; next_RXByteOldest <= RXByteOld; next_RXByteOld <= RXByte; end end `PROC_PKT_DATA_LOOP_FIFO_FULL: begin NextState_getPkt <= `PROC_PKT_DATA_LOOP_W_D; end `PROC_PKT_DATA_LOOP_W_D: begin next_RXFifoWEn <= 1'b0; if ((RXDataValid == 1'b1) && (RXStreamStatusIn == `RX_PACKET_STREAM)) begin NextState_getPkt <= `PROC_PKT_DATA_LOOP_DELAY; next_RXByte <= RXDataIn; next_RXStreamStatus <= RXStreamStatusIn; end else if (RXDataValid == 1'b1) begin NextState_getPkt <= `PROC_PKT_DATA_FIN; next_RXByte <= RXDataIn; next_RXStreamStatus <= RXStreamStatusIn; end end `PROC_PKT_DATA_LOOP_DELAY: begin NextState_getPkt <= `PROC_PKT_DATA_LOOP_CHK_FIFO; end endcase end // Current State Logic (sequential) always @ (posedge clk) begin if (rst) CurrState_getPkt <= `START_GP; else CurrState_getPkt <= NextState_getPkt; end // Registered outputs logic always @ (posedge clk) begin if (rst) begin RXFifoWEn <= 1'b0; RXFifoData <= 8'h00; RXPacketRdy <= 1'b0; RxPID <= 4'h0; SIERxTimeOutEn <= 1'b0; RXOverflow <= 1'b0; NAKRxed <= 1'b0; stallRxed <= 1'b0; ACKRxed <= 1'b0; RXByte <= 8'h00; RXStreamStatus <= 8'h00; RXByteOldest <= 8'h00; CRCError <= 1'b0; bitStuffError <= 1'b0; dataSequence <= 1'b0; RXByteOld <= 8'h00; RXTimeOut <= 1'b0; end else begin RXFifoWEn <= next_RXFifoWEn; RXFifoData <= next_RXFifoData; RXPacketRdy <= next_RXPacketRdy; RxPID <= next_RxPID; SIERxTimeOutEn <= next_SIERxTimeOutEn; RXOverflow <= next_RXOverflow; NAKRxed <= next_NAKRxed; stallRxed <= next_stallRxed; ACKRxed <= next_ACKRxed; RXByte <= next_RXByte; RXStreamStatus <= next_RXStreamStatus; RXByteOldest <= next_RXByteOldest; CRCError <= next_CRCError; bitStuffError <= next_bitStuffError; dataSequence <= next_dataSequence; RXByteOld <= next_RXByteOld; RXTimeOut <= next_RXTimeOut; end end endmodule
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