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[/] [openrisc/] [trunk/] [orpsocv2/] [rtl/] [verilog/] [usbhostslave/] [USBTxWireArbiter.v] - Rev 584
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// File : ../RTL/serialInterfaceEngine/usbTxWireArbiter.v // Generated : 11/10/06 05:37:24 // From : ../RTL/serialInterfaceEngine/usbTxWireArbiter.asf // By : FSM2VHDL ver. 5.0.0.9 ////////////////////////////////////////////////////////////////////// //// //// //// usbTxWireArbiter //// //// //// 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 //// //// //// ////////////////////////////////////////////////////////////////////// // `include "timescale.v" `include "usbhostslave_constants_h.v" `include "usbhostslave_serialinterfaceengine_h.v" module USBTxWireArbiter (SIETxCtrl, SIETxData, SIETxFSRate, SIETxGnt, SIETxReq, SIETxWEn, TxBits, TxCtl, TxFSRate, USBWireRdyIn, USBWireRdyOut, USBWireWEn, clk, prcTxByteCtrl, prcTxByteData, prcTxByteFSRate, prcTxByteGnt, prcTxByteReq, prcTxByteWEn, rst); input SIETxCtrl; input [1:0] SIETxData; input SIETxFSRate; input SIETxReq; input SIETxWEn; input USBWireRdyIn; input clk; input prcTxByteCtrl; input [1:0] prcTxByteData; input prcTxByteFSRate; input prcTxByteReq; input prcTxByteWEn; input rst; output SIETxGnt; output [1:0] TxBits; output TxCtl; output TxFSRate; output USBWireRdyOut; output USBWireWEn; output prcTxByteGnt; wire SIETxCtrl; wire [1:0] SIETxData; wire SIETxFSRate; reg SIETxGnt, next_SIETxGnt; wire SIETxReq; wire SIETxWEn; reg [1:0] TxBits, next_TxBits; reg TxCtl, next_TxCtl; reg TxFSRate, next_TxFSRate; wire USBWireRdyIn; reg USBWireRdyOut, next_USBWireRdyOut; reg USBWireWEn, next_USBWireWEn; wire clk; wire prcTxByteCtrl; wire [1:0] prcTxByteData; wire prcTxByteFSRate; reg prcTxByteGnt, next_prcTxByteGnt; wire prcTxByteReq; wire prcTxByteWEn; wire rst; // diagram signals declarations reg muxSIENotPTXB, next_muxSIENotPTXB; // BINARY ENCODED state machine: txWireArb // State codes definitions: `define START_TARB 2'b00 `define TARB_WAIT_REQ 2'b01 `define PTXB_ACT 2'b10 `define SIE_TX_ACT 2'b11 reg [1:0] CurrState_txWireArb; reg [1:0] NextState_txWireArb; // Diagram actions (continuous assignments allowed only: assign ...) // processTxByte/SIETransmitter mux always @(USBWireRdyIn) begin USBWireRdyOut <= USBWireRdyIn; end always @(muxSIENotPTXB or SIETxWEn or SIETxData or SIETxCtrl or prcTxByteWEn or prcTxByteData or prcTxByteCtrl or SIETxFSRate or prcTxByteFSRate) begin if (muxSIENotPTXB == 1'b1) begin USBWireWEn <= SIETxWEn; TxBits <= SIETxData; TxCtl <= SIETxCtrl; TxFSRate <= SIETxFSRate; end else begin USBWireWEn <= prcTxByteWEn; TxBits <= prcTxByteData; TxCtl <= prcTxByteCtrl; TxFSRate <= prcTxByteFSRate; end end //-------------------------------------------------------------------- // Machine: txWireArb //-------------------------------------------------------------------- //---------------------------------- // Next State Logic (combinatorial) //---------------------------------- always @ (prcTxByteReq or SIETxReq or prcTxByteGnt or muxSIENotPTXB or SIETxGnt or CurrState_txWireArb) begin : txWireArb_NextState NextState_txWireArb <= CurrState_txWireArb; // Set default values for outputs and signals next_prcTxByteGnt <= prcTxByteGnt; next_muxSIENotPTXB <= muxSIENotPTXB; next_SIETxGnt <= SIETxGnt; case (CurrState_txWireArb) `START_TARB: NextState_txWireArb <= `TARB_WAIT_REQ; `TARB_WAIT_REQ: if (prcTxByteReq == 1'b1) begin NextState_txWireArb <= `PTXB_ACT; next_prcTxByteGnt <= 1'b1; next_muxSIENotPTXB <= 1'b0; end else if (SIETxReq == 1'b1) begin NextState_txWireArb <= `SIE_TX_ACT; next_SIETxGnt <= 1'b1; next_muxSIENotPTXB <= 1'b1; end `PTXB_ACT: if (prcTxByteReq == 1'b0) begin NextState_txWireArb <= `TARB_WAIT_REQ; next_prcTxByteGnt <= 1'b0; end `SIE_TX_ACT: if (SIETxReq == 1'b0) begin NextState_txWireArb <= `TARB_WAIT_REQ; next_SIETxGnt <= 1'b0; end endcase end //---------------------------------- // Current State Logic (sequential) //---------------------------------- always @ (posedge clk) begin : txWireArb_CurrentState if (rst) CurrState_txWireArb <= `START_TARB; else CurrState_txWireArb <= NextState_txWireArb; end //---------------------------------- // Registered outputs logic //---------------------------------- always @ (posedge clk) begin : txWireArb_RegOutput if (rst) begin muxSIENotPTXB <= 1'b0; prcTxByteGnt <= 1'b0; SIETxGnt <= 1'b0; end else begin muxSIENotPTXB <= next_muxSIENotPTXB; prcTxByteGnt <= next_prcTxByteGnt; SIETxGnt <= next_SIETxGnt; end end endmodule
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