Subversion Repositories usbhostslave

 
// File        : ../RTL/hostController/softransmit.v
// Generated   : 10/06/06 19:35:27
// From        : ../RTL/hostController/softransmit.asf
// By          : FSM2VHDL ver. 5.0.0.9
 
//////////////////////////////////////////////////////////////////////
////                                                              ////
//// 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                     ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
//
`include "timescale.v"
`include "usbHostControl_h.v"
 
 
module SOFTransmit (SOFEnable, SOFSent, SOFSyncEn, SOFTimerClr, SOFTimer, clk, rst, sendPacketArbiterGnt, sendPacketArbiterReq, sendPacketRdy, sendPacketWEn);
input   SOFEnable;		// After host software asserts SOFEnable, must wait TBD time before asserting SOFSyncEn
input   SOFSyncEn;
input   [15:0] SOFTimer;
input   clk;
input   rst;
input   sendPacketArbiterGnt;
input   sendPacketRdy;
output  SOFSent;		// single cycle pulse
output  SOFTimerClr;		// Single cycle pulse
output  sendPacketArbiterReq;
output  sendPacketWEn;
 
wire    SOFEnable;
reg     SOFSent, next_SOFSent;
wire    SOFSyncEn;
reg     SOFTimerClr, next_SOFTimerClr;
wire    [15:0] SOFTimer;
wire    clk;
wire    rst;
wire    sendPacketArbiterGnt;
reg     sendPacketArbiterReq, next_sendPacketArbiterReq;
wire    sendPacketRdy;
reg     sendPacketWEn, next_sendPacketWEn;
 
// diagram signals declarations
reg  [7:0]i, next_i;
 
// 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
`define DLY_SOF_CHK1 3'b101
`define DLY_SOF_CHK2 3'b110
 
reg [2:0] CurrState_SOFTx;
reg [2:0] NextState_SOFTx;
 
 
//--------------------------------------------------------------------
// Machine: SOFTx
//--------------------------------------------------------------------
//----------------------------------
// Next State Logic (combinatorial)
//----------------------------------
always @ (i or SOFTimer or SOFSyncEn or SOFEnable or sendPacketArbiterGnt or sendPacketRdy or sendPacketArbiterReq or sendPacketWEn or SOFTimerClr or SOFSent or CurrState_SOFTx)
begin : SOFTx_NextState
	NextState_SOFTx <= CurrState_SOFTx;
	// Set default values for outputs and signals
	next_sendPacketArbiterReq <= sendPacketArbiterReq;
	next_sendPacketWEn <= sendPacketWEn;
	next_SOFTimerClr <= SOFTimerClr;
	next_SOFSent <= SOFSent;
	next_i <= i;
	case (CurrState_SOFTx)
		`START_STX:
			NextState_SOFTx <= `WAIT_SOF_NEAR;
		`WAIT_SOF_NEAR:
			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
		`WAIT_SP_GNT:
			if (sendPacketArbiterGnt == 1'b1 && sendPacketRdy == 1'b1)	
				NextState_SOFTx <= `WAIT_SOF_NOW;
		`WAIT_SOF_NOW:
			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
		`SOF_FIN:
		begin
			next_sendPacketWEn <= 1'b0;
			next_SOFTimerClr <= 1'b0;
			next_SOFSent <= 1'b0;
			if (sendPacketRdy == 1'b1)	
			begin
				NextState_SOFTx <= `DLY_SOF_CHK1;
				next_i <= 8'h00;
			end
		end
		`DLY_SOF_CHK1:
		begin
			next_i <= i + 1'b1;
			if (i==8'hff)	
			begin
				NextState_SOFTx <= `DLY_SOF_CHK2;
				next_sendPacketArbiterReq <= 1'b0;
				next_i <= 8'h00;
			end
		end
		`DLY_SOF_CHK2:
		begin
			next_i <= i + 1'b1;
			if (i==8'hff)	
				NextState_SOFTx <= `WAIT_SOF_NEAR;
		end
	endcase
end
 
//----------------------------------
// Current State Logic (sequential)
//----------------------------------
always @ (posedge clk)
begin : SOFTx_CurrentState
	if (rst)	
		CurrState_SOFTx <= `START_STX;
	else
		CurrState_SOFTx <= NextState_SOFTx;
end
 
//----------------------------------
// Registered outputs logic
//----------------------------------
always @ (posedge clk)
begin : SOFTx_RegOutput
	if (rst)	
	begin
		i <= 8'h00;
		SOFSent <= 1'b0;
		SOFTimerClr <= 1'b0;
		sendPacketArbiterReq <= 1'b0;
		sendPacketWEn <= 1'b0;
	end
	else 
	begin
		i <= next_i;
		SOFSent <= next_SOFSent;
		SOFTimerClr <= next_SOFTimerClr;
		sendPacketArbiterReq <= next_sendPacketArbiterReq;
		sendPacketWEn <= next_sendPacketWEn;
	end
end
 
endmodule