/////////////////////////////////////////////////////////////////////////                                                             ////////  UTMI Line Status & Speed Negotiation block                 ////////                                                             ////////                                                             ////////  Author: Rudolf Usselmann                                   ////////          rudi@asics.ws                                      ////////                                                             ////////                                                             ////////  Downloaded from: http://www.opencores.org/cores/usb/       ////////                                                             /////////////////////////////////////////////////////////////////////////////                                                             //////// Copyright (C) 2000 Rudolf Usselmann                         ////////                    rudi@asics.ws                            ////////                                                             //////// 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 SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY     //////// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED   //////// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS   //////// FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL THE AUTHOR      //////// OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,         //////// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES    //////// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE   //////// GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR        //////// BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF  //////// LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT  //////// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT  //////// OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE         //////// POSSIBILITY OF SUCH DAMAGE.                                 ////////                                                             ///////////////////////////////////////////////////////////////////////////  CVS Log////  $Id: usbf_utmi_ls.v,v 1.2 2001/08/10 08:48:33 rudi Exp $////  $Date: 2001/08/10 08:48:33 $//  $Revision: 1.2 $//  $Author: rudi $//  $Locker:  $//  $State: Exp $//// Change History://               $Log: usbf_utmi_ls.v,v $//               Revision 1.2  2001/08/10 08:48:33  rudi////               - Changed IO names to be more clear.//               - Uniquifyed define names to be core specific.////               Revision 1.1  2001/08/03 05:30:09  rudi//////               1) Reorganized directory structure////               Revision 1.2  2001/03/31 13:00:52  rudi////               - Added Core configuration//               - Added handling of OUT packets less than MAX_PL_SZ in DMA mode//               - Modified WISHBONE interface and sync logic//               - Moved SSRAM outside the core (added interface)//               - Many small bug fixes ...////               Revision 1.1  2001/03/07 09:08:13  rudi////               Added USB control signaling (Line Status) block. Fixed some minor//               typos, added resume bit and signal.//////`include "usbf_defines.v"module usbf_utmi_ls( clk, rst,		resume_req,		// UTMI Interface		rx_active, tx_ready, drive_k,		XcvSelect, TermSel, SuspendM, LineState, OpMode,		usb_vbus,		// Misc Interfaces		mode_hs, usb_reset, usb_suspend, usb_attached		);input		clk;input		rst;input		resume_req;input		rx_active, tx_ready;output		drive_k;output		XcvSelect;output		TermSel;output		SuspendM;input	[1:0]	LineState;output	[1:0]	OpMode;input		usb_vbus;output		mode_hs;	// High Speed Modeoutput		usb_reset;	// USB Resetoutput		usb_suspend;	// USB Suspendoutput		usb_attached;	// Attached to USB/////////////////////////////////////////////////////////////////////// Parameters//parameter	[14:0]	// synopsys enum state	POR		= 15'b000_0000_0000_0001,	NORMAL		= 15'b000_0000_0000_0010,	RES_SUSP	= 15'b000_0000_0000_0100,	SUSPEND		= 15'b000_0000_0000_1000,	RESUME		= 15'b000_0000_0001_0000,	RESUME_REQ	= 15'b000_0000_0010_0000,	RESUME_WAIT	= 15'b000_0000_0100_0000,	RESUME_SIG	= 15'b000_0000_1000_0000,	ATTACH		= 15'b000_0001_0000_0000,	RESET		= 15'b000_0010_0000_0000,	SPEED_NEG	= 15'b000_0100_0000_0000,	SPEED_NEG_K	= 15'b000_1000_0000_0000,	SPEED_NEG_J	= 15'b001_0000_0000_0000,	SPEED_NEG_HS	= 15'b010_0000_0000_0000,	SPEED_NEG_FS	= 15'b100_0000_0000_0000;/////////////////////////////////////////////////////////////////////// Local Wires and Registers//reg	[14:0]	/* synopsys enum state */ state, next_state;// synopsys state_vector statereg	[1:0]	line_state_r;reg		mode_hs, mode_set_hs, mode_set_fs;reg		usb_suspend, suspend_set, suspend_clr;reg		usb_attached, attached_set, attached_clr;reg		TermSel, fs_term_on, fs_term_off;reg		XcvSelect, xcv_set_hs, xcv_set_fs;reg	[1:0]	OpMode;reg		bit_stuff_on, bit_stuff_off;reg		usb_reset, usb_reset_d;wire		ls_se0, ls_j, ls_k, ls_se1;reg		ls_k_r, ls_j_r, ls_se0_r;reg		ls_idle_r, ls_idle_r1;wire		ls_idle;reg		idle_long;wire		idle_long_set, idle_long_clr;wire		k_long, j_long, se0_long;reg		drive_k, drive_k_d;reg	[3:0]	ps_cnt;reg		ps_cnt_clr;reg		idle_cnt_clr;reg		idle_cnt1_clr;reg	[7:0]	idle_cnt1, idle_cnt1_next;reg	[5:0]	idle_cnt2;reg		T1_gt_2_5_uS, T1_gt_100_uS, T1_st_3_0_mS, T1_gt_3_0_mS;reg		T1_gt_3_125_mS, T1_gt_5_0_mS;reg	[7:0]	me_ps;reg		me_cnt_clr;reg		me_ps_2_5_us;reg	[7:0]	me_ps2;reg		me_ps2_0_5_ms;reg	[7:0]	me_cnt;reg		me_cnt_100_ms;reg		T2_gt_100_uS, T2_wakeup, T2_gt_1_0_mS, T2_gt_1_2_mS;reg	[2:0]	chirp_cnt;reg		chirp_cnt_clr, chirp_cnt_inc;reg		chirp_cnt_is_6;wire		resume_req_sr;/////////////////////////////////////////////////////////////////////// Misc Logic//always @(posedge clk)	drive_k <= #1 drive_k_d;assign SuspendM = (usb_suspend & !resume_req_sr) | (LineState == 2'b10);assign resume_req_sr = (!rst | usb_suspend) ? 0 : resume_req ? 1 : resume_req_sr;// ---------------------------------------------------------// USB State/Operation Mode JK Flopsalways @(posedge clk)	if(mode_set_fs)		mode_hs <= #1 0;	else	if(mode_set_hs)		mode_hs <= #1 1;always @(posedge clk)	if(suspend_clr)		usb_suspend <= #1 0;	else	if(suspend_set)		usb_suspend <= #1 1;always @(posedge clk)	if(attached_clr)	usb_attached <= #1 0;	else	if(attached_set)	usb_attached <= #1 1;always @(posedge clk)	if(fs_term_off)		TermSel <= #1 0;	else	if(fs_term_on)		TermSel <= #1 1;always @(posedge clk)	if(xcv_set_fs)		XcvSelect <= #1 1;	else	if(xcv_set_hs)		XcvSelect <= #1 0;always @(posedge clk)	if(bit_stuff_off)	OpMode <= #1 2'b10;	else	if(bit_stuff_on)	OpMode <= #1 2'b00;always @(posedge clk)	usb_reset <= #1 usb_reset_d;// ---------------------------------------------------------// Line State Detectoralways @(posedge clk)	line_state_r <= #1 LineState;assign ls_se0 = (line_state_r == 2'b00);assign ls_j   = (line_state_r == 2'b01);assign ls_k   = (line_state_r == 2'b10);assign ls_se1 = (line_state_r == 2'b11);assign ls_idle = mode_hs ? ls_se0 : ls_j;// Idle Detection// Idle Has to persist for at least two cycles in a roe in the// same state to recognizedalways @(posedge clk)	ls_idle_r <= #1 ls_idle;assign idle_long_set = ls_idle & ls_idle_r;assign idle_long_clr = !ls_idle & !ls_idle_r;always @(posedge clk)	if(!rst)		idle_long <= #1 0;	else	if(idle_long_clr)	idle_long <= #1 0;	else	if(idle_long_set)	idle_long <= #1 1;// Detect Signals for two cycles ina row before making a transaction ...always @(posedge clk)	ls_k_r <= #1 ls_k;always @(posedge clk)	ls_j_r <= #1 ls_j;always @(posedge clk)	ls_se0_r <= #1 ls_se0;assign k_long = ls_k & ls_k_r;assign j_long = ls_j & ls_j_r;assign se0_long = ls_se0 & ls_se0_r;/////////////////////////////////////////////////////////////////////// Counters//// ---------------------------------------------------------// idle Counter// Pre-Scaler// Generates a 0.25 uS Count Enable (ps_cnt_clr)always @(posedge clk)	if(!idle_long | idle_cnt_clr | ps_cnt_clr)	ps_cnt <= #1 0;	else						ps_cnt <= #1 ps_cnt + 1;always @(posedge clk)		// Clear the pre-scaler in 250 nS intervals	ps_cnt_clr <= #1 (ps_cnt == `USBF_T1_PS_250_NS);// Count uSalways @(posedge clk)	if(!idle_long | idle_cnt1_clr | idle_cnt_clr)	idle_cnt1 <= #1 0;	else	if(!T1_gt_3_125_mS & ps_cnt_clr)		idle_cnt1 <= #1 idle_cnt1_next;always @(posedge clk)	idle_cnt1_next <= #1 idle_cnt1 + 1;always @(posedge clk)		// Clear the uS counter every 62.5 uS	idle_cnt1_clr <= #1 idle_cnt1 == `USBF_T1_C_62_5_US;// Count mSalways @(posedge clk)	if(!idle_long | idle_cnt_clr)		idle_cnt2 <= #1 0;	else	if(!T1_gt_5_0_mS & idle_cnt1_clr)	idle_cnt2 <= #1 idle_cnt2 + 1;always @(posedge clk)	// Greater Than 2.5uS (Actual Time will be T0+2.75uS)