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https://opencores.org/ocsvn/usbhostslave/usbhostslave/trunk
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[/] [usbhostslave/] [tags/] [rel_00_06_alpha/] [RTL/] [serialInterfaceEngine/] [siereceiver.v] - Rev 9
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////////////////////////////////////////////////////////////////////// //// //// //// SIEReceiver //// //// //// 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" module SIEReceiver (clk, connectState, rst, RxWireDataIn, RxWireDataWEn); input clk; input rst; input [1:0]RxWireDataIn; input RxWireDataWEn; output [1:0]connectState; wire clk; reg [1:0]connectState, next_connectState; wire rst; wire [1:0]RxWireDataIn; wire RxWireDataWEn; // diagram signals declarations reg [1:0]RxBits, next_RxBits; reg [3:0]RXStMachCurrState, next_RXStMachCurrState; reg [7:0]RXWaitCount, next_RXWaitCount; // BINARY ENCODED state machine: rcvr // State codes definitions: `define WAIT_FS_CONN_CHK_RX_BITS 4'b0000 `define WAIT_LS_CONN_CHK_RX_BITS 4'b0001 `define LS_CONN_CHK_RX_BITS 4'b0010 `define DISCNCT_CHK_RXBITS 4'b0011 `define WAIT_BIT 4'b0100 `define START_SRX 4'b0101 `define FS_CONN_CHK_RX_BITS1 4'b0110 `define WAIT_LS_DIS_CHK_RX_BITS 4'b0111 `define WAIT_FS_DIS_CHK_RX_BITS2 4'b1000 reg [3:0]CurrState_rcvr, NextState_rcvr; // Machine: rcvr // NextState logic (combinatorial) always @ (RXWaitCount or RxBits or RxWireDataWEn or RxWireDataIn or connectState or RXStMachCurrState or CurrState_rcvr) begin NextState_rcvr <= CurrState_rcvr; // Set default values for outputs and signals next_RXWaitCount <= RXWaitCount; next_connectState <= connectState; next_RXStMachCurrState <= RXStMachCurrState; next_RxBits <= RxBits; case (CurrState_rcvr) // synopsys parallel_case full_case `WAIT_BIT: begin if ((RxWireDataWEn == 1'b1) && (RXStMachCurrState == `WAIT_LOW_SPEED_CONN_ST)) begin NextState_rcvr <= `WAIT_LS_CONN_CHK_RX_BITS; next_RxBits <= RxWireDataIn; end else if ((RxWireDataWEn == 1'b1) && (RXStMachCurrState == `CONNECT_LOW_SPEED_ST)) begin NextState_rcvr <= `LS_CONN_CHK_RX_BITS; next_RxBits <= RxWireDataIn; end else if ((RxWireDataWEn == 1'b1) && (RXStMachCurrState == `CONNECT_FULL_SPEED_ST)) begin NextState_rcvr <= `FS_CONN_CHK_RX_BITS1; next_RxBits <= RxWireDataIn; end else if ((RxWireDataWEn == 1'b1) && (RXStMachCurrState == `WAIT_LOW_SP_DISCONNECT_ST)) begin NextState_rcvr <= `WAIT_LS_DIS_CHK_RX_BITS; next_RxBits <= RxWireDataIn; end else if ((RxWireDataWEn == 1'b1) && (RXStMachCurrState == `WAIT_FULL_SP_DISCONNECT_ST)) begin NextState_rcvr <= `WAIT_FS_DIS_CHK_RX_BITS2; next_RxBits <= RxWireDataIn; end else if ((RxWireDataWEn == 1'b1) && (RXStMachCurrState == `DISCONNECT_ST)) begin NextState_rcvr <= `DISCNCT_CHK_RXBITS; next_RxBits <= RxWireDataIn; end else if ((RxWireDataWEn == 1'b1) && (RXStMachCurrState == `WAIT_FULL_SPEED_CONN_ST)) begin NextState_rcvr <= `WAIT_FS_CONN_CHK_RX_BITS; next_RxBits <= RxWireDataIn; end end `START_SRX: begin next_RXStMachCurrState <= `DISCONNECT_ST; next_RXWaitCount <= 8'h00; next_connectState <= `DISCONNECT; next_RxBits <= 2'b00; NextState_rcvr <= `WAIT_BIT; end `DISCNCT_CHK_RXBITS: begin if (RxBits == `ZERO_ONE) begin NextState_rcvr <= `WAIT_BIT; next_RXStMachCurrState <= `WAIT_LOW_SPEED_CONN_ST; next_RXWaitCount <= 8'h00; end else if (RxBits == `ONE_ZERO) begin NextState_rcvr <= `WAIT_BIT; next_RXStMachCurrState <= `WAIT_FULL_SPEED_CONN_ST; next_RXWaitCount <= 8'h00; end else begin NextState_rcvr <= `WAIT_BIT; end end `WAIT_FS_CONN_CHK_RX_BITS: begin if (RxBits == `ONE_ZERO) begin next_RXWaitCount <= RXWaitCount + 1'b1; if (RXWaitCount == `CONNECT_WAIT_TIME) begin next_connectState <= `FULL_SPEED_CONNECT; next_RXStMachCurrState <= `CONNECT_FULL_SPEED_ST; end end else begin next_RXStMachCurrState <= `DISCONNECT_ST; end NextState_rcvr <= `WAIT_BIT; end `WAIT_LS_CONN_CHK_RX_BITS: begin if (RxBits == `ZERO_ONE) begin next_RXWaitCount <= RXWaitCount + 1'b1; if (RXWaitCount == `CONNECT_WAIT_TIME) begin next_connectState <= `LOW_SPEED_CONNECT; next_RXStMachCurrState <= `CONNECT_LOW_SPEED_ST; end end else begin next_RXStMachCurrState <= `DISCONNECT_ST; end NextState_rcvr <= `WAIT_BIT; end `LS_CONN_CHK_RX_BITS: begin NextState_rcvr <= `WAIT_BIT; if (RxBits == `SE0) begin next_RXStMachCurrState <= `WAIT_LOW_SP_DISCONNECT_ST; next_RXWaitCount <= 0; end end `FS_CONN_CHK_RX_BITS1: begin NextState_rcvr <= `WAIT_BIT; if (RxBits == `SE0) begin next_RXStMachCurrState <= `WAIT_FULL_SP_DISCONNECT_ST; next_RXWaitCount <= 0; end end `WAIT_LS_DIS_CHK_RX_BITS: begin NextState_rcvr <= `WAIT_BIT; if (RxBits == `SE0) begin next_RXWaitCount <= RXWaitCount + 1'b1; if (RXWaitCount == `DISCONNECT_WAIT_TIME) begin next_RXStMachCurrState <= `DISCONNECT_ST; next_connectState <= `DISCONNECT; end end else begin next_RXStMachCurrState <= `CONNECT_LOW_SPEED_ST; end end `WAIT_FS_DIS_CHK_RX_BITS2: begin NextState_rcvr <= `WAIT_BIT; if (RxBits == `SE0) begin next_RXWaitCount <= RXWaitCount + 1'b1; if (RXWaitCount == `DISCONNECT_WAIT_TIME) begin next_RXStMachCurrState <= `DISCONNECT_ST; next_connectState <= `DISCONNECT; end end else begin next_RXStMachCurrState <= `CONNECT_FULL_SPEED_ST; end end endcase end // Current State Logic (sequential) always @ (posedge clk) begin if (rst) CurrState_rcvr <= `START_SRX; else CurrState_rcvr <= NextState_rcvr; end // Registered outputs logic always @ (posedge clk) begin if (rst) begin connectState <= `DISCONNECT; RXWaitCount <= 8'h00; RXStMachCurrState <= `DISCONNECT_ST; RxBits <= 2'b00; end else begin connectState <= next_connectState; RXWaitCount <= next_RXWaitCount; RXStMachCurrState <= next_RXStMachCurrState; RxBits <= next_RxBits; end end endmodule
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