summaryrefslogtreecommitdiff
path: root/tests/iwls2005/usb_phy
diff options
context:
space:
mode:
Diffstat (limited to 'tests/iwls2005/usb_phy')
-rw-r--r--tests/iwls2005/usb_phy/timescale.v1
-rw-r--r--tests/iwls2005/usb_phy/usb_phy.v184
-rw-r--r--tests/iwls2005/usb_phy/usb_rx_phy.v452
-rw-r--r--tests/iwls2005/usb_phy/usb_tx_phy.v465
4 files changed, 0 insertions, 1102 deletions
diff --git a/tests/iwls2005/usb_phy/timescale.v b/tests/iwls2005/usb_phy/timescale.v
deleted file mode 100644
index ff9e265a..00000000
--- a/tests/iwls2005/usb_phy/timescale.v
+++ /dev/null
@@ -1 +0,0 @@
-`timescale 1ns / 10ps
diff --git a/tests/iwls2005/usb_phy/usb_phy.v b/tests/iwls2005/usb_phy/usb_phy.v
deleted file mode 100644
index 4ee345ad..00000000
--- a/tests/iwls2005/usb_phy/usb_phy.v
+++ /dev/null
@@ -1,184 +0,0 @@
-/////////////////////////////////////////////////////////////////////
-//// ////
-//// USB 1.1 PHY ////
-//// ////
-//// ////
-//// Author: Rudolf Usselmann ////
-//// rudi@asics.ws ////
-//// ////
-//// ////
-//// Downloaded from: http://www.opencores.org/cores/usb_phy/ ////
-//// ////
-/////////////////////////////////////////////////////////////////////
-//// ////
-//// Copyright (C) 2000-2002 Rudolf Usselmann ////
-//// www.asics.ws ////
-//// 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: usb_phy.v,v 1.4 2003/10/21 05:58:40 rudi Exp $
-//
-// $Date: 2003/10/21 05:58:40 $
-// $Revision: 1.4 $
-// $Author: rudi $
-// $Locker: $
-// $State: Exp $
-//
-// Change History:
-// $Log: usb_phy.v,v $
-// Revision 1.4 2003/10/21 05:58:40 rudi
-// usb_rst is no longer or'ed with the incomming reset internally.
-// Now usb_rst is simply an output, the application can decide how
-// to utilize it.
-//
-// Revision 1.3 2003/10/19 17:40:13 rudi
-// - Made core more robust against line noise
-// - Added Error Checking and Reporting
-// (See README.txt for more info)
-//
-// Revision 1.2 2002/09/16 16:06:37 rudi
-// Changed top level name to be consistent ...
-//
-// Revision 1.1.1.1 2002/09/16 14:26:59 rudi
-// Created Directory Structure
-//
-//
-//
-//
-//
-//
-//
-//
-
-`include "timescale.v"
-
-module usb_phy(clk, rst, phy_tx_mode, usb_rst,
-
- // Transciever Interface
- txdp, txdn, txoe,
- rxd, rxdp, rxdn,
-
- // UTMI Interface
- DataOut_i, TxValid_i, TxReady_o, RxValid_o,
- RxActive_o, RxError_o, DataIn_o, LineState_o
- );
-
-input clk;
-input rst;
-input phy_tx_mode;
-output usb_rst;
-output txdp, txdn, txoe;
-input rxd, rxdp, rxdn;
-input [7:0] DataOut_i;
-input TxValid_i;
-output TxReady_o;
-output [7:0] DataIn_o;
-output RxValid_o;
-output RxActive_o;
-output RxError_o;
-output [1:0] LineState_o;
-
-///////////////////////////////////////////////////////////////////
-//
-// Local Wires and Registers
-//
-
-reg [4:0] rst_cnt;
-reg usb_rst;
-wire fs_ce;
-wire rst;
-
-///////////////////////////////////////////////////////////////////
-//
-// Misc Logic
-//
-
-///////////////////////////////////////////////////////////////////
-//
-// TX Phy
-//
-
-usb_tx_phy i_tx_phy(
- .clk( clk ),
- .rst( rst ),
- .fs_ce( fs_ce ),
- .phy_mode( phy_tx_mode ),
-
- // Transciever Interface
- .txdp( txdp ),
- .txdn( txdn ),
- .txoe( txoe ),
-
- // UTMI Interface
- .DataOut_i( DataOut_i ),
- .TxValid_i( TxValid_i ),
- .TxReady_o( TxReady_o )
- );
-
-///////////////////////////////////////////////////////////////////
-//
-// RX Phy and DPLL
-//
-
-usb_rx_phy i_rx_phy(
- .clk( clk ),
- .rst( rst ),
- .fs_ce( fs_ce ),
-
- // Transciever Interface
- .rxd( rxd ),
- .rxdp( rxdp ),
- .rxdn( rxdn ),
-
- // UTMI Interface
- .DataIn_o( DataIn_o ),
- .RxValid_o( RxValid_o ),
- .RxActive_o( RxActive_o ),
- .RxError_o( RxError_o ),
- .RxEn_i( txoe ),
- .LineState( LineState_o )
- );
-
-///////////////////////////////////////////////////////////////////
-//
-// Generate an USB Reset is we see SE0 for at least 2.5uS
-//
-
-`ifdef USB_ASYNC_REST
-always @(posedge clk or negedge rst)
-`else
-always @(posedge clk)
-`endif
- if(!rst) rst_cnt <= 5'h0;
- else
- if(LineState_o != 2'h0) rst_cnt <= 5'h0;
- else
- if(!usb_rst && fs_ce) rst_cnt <= rst_cnt + 5'h1;
-
-always @(posedge clk)
- usb_rst <= (rst_cnt == 5'h1f);
-
-endmodule
-
diff --git a/tests/iwls2005/usb_phy/usb_rx_phy.v b/tests/iwls2005/usb_phy/usb_rx_phy.v
deleted file mode 100644
index c0568fb7..00000000
--- a/tests/iwls2005/usb_phy/usb_rx_phy.v
+++ /dev/null
@@ -1,452 +0,0 @@
-/////////////////////////////////////////////////////////////////////
-//// ////
-//// USB 1.1 PHY ////
-//// RX & DPLL ////
-//// ////
-//// ////
-//// Author: Rudolf Usselmann ////
-//// rudi@asics.ws ////
-//// ////
-//// ////
-//// Downloaded from: http://www.opencores.org/cores/usb_phy/ ////
-//// ////
-/////////////////////////////////////////////////////////////////////
-//// ////
-//// Copyright (C) 2000-2002 Rudolf Usselmann ////
-//// www.asics.ws ////
-//// 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: usb_rx_phy.v,v 1.5 2004/10/19 09:29:07 rudi Exp $
-//
-// $Date: 2004/10/19 09:29:07 $
-// $Revision: 1.5 $
-// $Author: rudi $
-// $Locker: $
-// $State: Exp $
-//
-// Change History:
-// $Log: usb_rx_phy.v,v $
-// Revision 1.5 2004/10/19 09:29:07 rudi
-// Fixed DPLL alignment in the rx_phy and bit stuffing errors in the tx_phy (if last bit bit was a stuff bit in a packet it was omitted).
-//
-// Revision 1.4 2003/12/02 04:56:00 rudi
-// Fixed a bug reported by Karl C. Posch from Graz University of Technology. Thanks Karl !
-//
-// Revision 1.3 2003/10/19 18:07:45 rudi
-// - Fixed Sync Error to be only checked/generated during the sync phase
-//
-// Revision 1.2 2003/10/19 17:40:13 rudi
-// - Made core more robust against line noise
-// - Added Error Checking and Reporting
-// (See README.txt for more info)
-//
-// Revision 1.1.1.1 2002/09/16 14:27:01 rudi
-// Created Directory Structure
-//
-//
-//
-//
-//
-//
-//
-//
-
-`include "timescale.v"
-
-module usb_rx_phy( clk, rst, fs_ce,
-
- // Transciever Interface
- rxd, rxdp, rxdn,
-
- // UTMI Interface
- RxValid_o, RxActive_o, RxError_o, DataIn_o,
- RxEn_i, LineState);
-
-input clk;
-input rst;
-output fs_ce;
-input rxd, rxdp, rxdn;
-output [7:0] DataIn_o;
-output RxValid_o;
-output RxActive_o;
-output RxError_o;
-input RxEn_i;
-output [1:0] LineState;
-
-///////////////////////////////////////////////////////////////////
-//
-// Local Wires and Registers
-//
-
-reg rxd_s0, rxd_s1, rxd_s;
-reg rxdp_s0, rxdp_s1, rxdp_s, rxdp_s_r;
-reg rxdn_s0, rxdn_s1, rxdn_s, rxdn_s_r;
-reg synced_d;
-wire k, j, se0;
-reg rxd_r;
-reg rx_en;
-reg rx_active;
-reg [2:0] bit_cnt;
-reg rx_valid1, rx_valid;
-reg shift_en;
-reg sd_r;
-reg sd_nrzi;
-reg [7:0] hold_reg;
-wire drop_bit; // Indicates a stuffed bit
-reg [2:0] one_cnt;
-
-reg [1:0] dpll_state, dpll_next_state;
-reg fs_ce_d;
-reg fs_ce;
-wire change;
-wire lock_en;
-reg [2:0] fs_state, fs_next_state;
-reg rx_valid_r;
-reg sync_err_d, sync_err;
-reg bit_stuff_err;
-reg se0_r, byte_err;
-reg se0_s;
-
-///////////////////////////////////////////////////////////////////
-//
-// Misc Logic
-//
-
-assign RxActive_o = rx_active;
-assign RxValid_o = rx_valid;
-assign RxError_o = sync_err | bit_stuff_err | byte_err;
-assign DataIn_o = hold_reg;
-assign LineState = {rxdn_s1, rxdp_s1};
-
-always @(posedge clk) rx_en <= RxEn_i;
-always @(posedge clk) sync_err <= !rx_active & sync_err_d;
-
-///////////////////////////////////////////////////////////////////
-//
-// Synchronize Inputs
-//
-
-// First synchronize to the local system clock to
-// avoid metastability outside the sync block (*_s0).
-// Then make sure we see the signal for at least two
-// clock cycles stable to avoid glitches and noise
-
-always @(posedge clk) rxd_s0 <= rxd;
-always @(posedge clk) rxd_s1 <= rxd_s0;
-always @(posedge clk) // Avoid detecting Line Glitches and noise
- if(rxd_s0 && rxd_s1) rxd_s <= 1'b1;
- else
- if(!rxd_s0 && !rxd_s1) rxd_s <= 1'b0;
-
-always @(posedge clk) rxdp_s0 <= rxdp;
-always @(posedge clk) rxdp_s1 <= rxdp_s0;
-always @(posedge clk) rxdp_s_r <= rxdp_s0 & rxdp_s1;
-always @(posedge clk) rxdp_s <= (rxdp_s0 & rxdp_s1) | rxdp_s_r; // Avoid detecting Line Glitches and noise
-
-always @(posedge clk) rxdn_s0 <= rxdn;
-always @(posedge clk) rxdn_s1 <= rxdn_s0;
-always @(posedge clk) rxdn_s_r <= rxdn_s0 & rxdn_s1;
-always @(posedge clk) rxdn_s <= (rxdn_s0 & rxdn_s1) | rxdn_s_r; // Avoid detecting Line Glitches and noise
-
-assign k = !rxdp_s & rxdn_s;
-assign j = rxdp_s & !rxdn_s;
-assign se0 = !rxdp_s & !rxdn_s;
-
-always @(posedge clk) if(fs_ce) se0_s <= se0;
-
-///////////////////////////////////////////////////////////////////
-//
-// DPLL
-//
-
-// This design uses a clock enable to do 12Mhz timing and not a
-// real 12Mhz clock. Everything always runs at 48Mhz. We want to
-// make sure however, that the clock enable is always exactly in
-// the middle between two virtual 12Mhz rising edges.
-// We monitor rxdp and rxdn for any changes and do the appropiate
-// adjustments.
-// In addition to the locking done in the dpll FSM, we adjust the
-// final latch enable to compensate for various sync registers ...
-
-// Allow lockinf only when we are receiving
-assign lock_en = rx_en;
-
-always @(posedge clk) rxd_r <= rxd_s;
-
-// Edge detector
-assign change = rxd_r != rxd_s;
-
-// DPLL FSM
-`ifdef USB_ASYNC_REST
-always @(posedge clk or negedge rst)
-`else
-always @(posedge clk)
-`endif
- if(!rst) dpll_state <= 2'h1;
- else dpll_state <= dpll_next_state;
-
-always @(dpll_state or lock_en or change)
- begin
- fs_ce_d = 1'b0;
- case(dpll_state) // synopsys full_case parallel_case
- 2'h0:
- if(lock_en && change) dpll_next_state = 2'h0;
- else dpll_next_state = 2'h1;
- 2'h1:begin
- fs_ce_d = 1'b1;
- if(lock_en && change) dpll_next_state = 2'h3;
- else dpll_next_state = 2'h2;
- end
- 2'h2:
- if(lock_en && change) dpll_next_state = 2'h0;
- else dpll_next_state = 2'h3;
- 2'h3:
- if(lock_en && change) dpll_next_state = 2'h0;
- else dpll_next_state = 2'h0;
- endcase
- end
-
-// Compensate for sync registers at the input - allign full speed
-// clock enable to be in the middle between two bit changes ...
-reg fs_ce_r1, fs_ce_r2;
-
-always @(posedge clk) fs_ce_r1 <= fs_ce_d;
-always @(posedge clk) fs_ce_r2 <= fs_ce_r1;
-always @(posedge clk) fs_ce <= fs_ce_r2;
-
-
-///////////////////////////////////////////////////////////////////
-//
-// Find Sync Pattern FSM
-//
-
-parameter FS_IDLE = 3'h0,
- K1 = 3'h1,
- J1 = 3'h2,
- K2 = 3'h3,
- J2 = 3'h4,
- K3 = 3'h5,
- J3 = 3'h6,
- K4 = 3'h7;
-
-`ifdef USB_ASYNC_REST
-always @(posedge clk or negedge rst)
-`else
-always @(posedge clk)
-`endif
- if(!rst) fs_state <= FS_IDLE;
- else fs_state <= fs_next_state;
-
-always @(fs_state or fs_ce or k or j or rx_en or rx_active or se0 or se0_s)
- begin
- synced_d = 1'b0;
- sync_err_d = 1'b0;
- fs_next_state = fs_state;
- if(fs_ce && !rx_active && !se0 && !se0_s)
- case(fs_state) // synopsys full_case parallel_case
- FS_IDLE:
- begin
- if(k && rx_en) fs_next_state = K1;
- end
- K1:
- begin
- if(j && rx_en) fs_next_state = J1;
- else
- begin
- sync_err_d = 1'b1;
- fs_next_state = FS_IDLE;
- end
- end
- J1:
- begin
- if(k && rx_en) fs_next_state = K2;
- else
- begin
- sync_err_d = 1'b1;
- fs_next_state = FS_IDLE;
- end
- end
- K2:
- begin
- if(j && rx_en) fs_next_state = J2;
- else
- begin
- sync_err_d = 1'b1;
- fs_next_state = FS_IDLE;
- end
- end
- J2:
- begin
- if(k && rx_en) fs_next_state = K3;
- else
- begin
- sync_err_d = 1'b1;
- fs_next_state = FS_IDLE;
- end
- end
- K3:
- begin
- if(j && rx_en) fs_next_state = J3;
- else
- if(k && rx_en)
- begin
- fs_next_state = FS_IDLE; // Allow missing first K-J
- synced_d = 1'b1;
- end
- else
- begin
- sync_err_d = 1'b1;
- fs_next_state = FS_IDLE;
- end
- end
- J3:
- begin
- if(k && rx_en) fs_next_state = K4;
- else
- begin
- sync_err_d = 1'b1;
- fs_next_state = FS_IDLE;
- end
- end
- K4:
- begin
- if(k) synced_d = 1'b1;
- fs_next_state = FS_IDLE;
- end
- endcase
- end
-
-///////////////////////////////////////////////////////////////////
-//
-// Generate RxActive
-//
-
-`ifdef USB_ASYNC_REST
-always @(posedge clk or negedge rst)
-`else
-always @(posedge clk)
-`endif
- if(!rst) rx_active <= 1'b0;
- else
- if(synced_d && rx_en) rx_active <= 1'b1;
- else
- if(se0 && rx_valid_r) rx_active <= 1'b0;
-
-always @(posedge clk)
- if(rx_valid) rx_valid_r <= 1'b1;
- else
- if(fs_ce) rx_valid_r <= 1'b0;
-
-///////////////////////////////////////////////////////////////////
-//
-// NRZI Decoder
-//
-
-always @(posedge clk)
- if(fs_ce) sd_r <= rxd_s;
-
-`ifdef USB_ASYNC_REST
-always @(posedge clk or negedge rst)
-`else
-always @(posedge clk)
-`endif
- if(!rst) sd_nrzi <= 1'b0;
- else
- if(!rx_active) sd_nrzi <= 1'b1;
- else
- if(rx_active && fs_ce) sd_nrzi <= !(rxd_s ^ sd_r);
-
-///////////////////////////////////////////////////////////////////
-//
-// Bit Stuff Detect
-//
-
-`ifdef USB_ASYNC_REST
-always @(posedge clk or negedge rst)
-`else
-always @(posedge clk)
-`endif
- if(!rst) one_cnt <= 3'h0;
- else
- if(!shift_en) one_cnt <= 3'h0;
- else
- if(fs_ce)
- begin
- if(!sd_nrzi || drop_bit) one_cnt <= 3'h0;
- else one_cnt <= one_cnt + 3'h1;
- end
-
-assign drop_bit = (one_cnt==3'h6);
-
-always @(posedge clk) bit_stuff_err <= drop_bit & sd_nrzi & fs_ce & !se0 & rx_active; // Bit Stuff Error
-
-///////////////////////////////////////////////////////////////////
-//
-// Serial => Parallel converter
-//
-
-always @(posedge clk)
- if(fs_ce) shift_en <= synced_d | rx_active;
-
-always @(posedge clk)
- if(fs_ce && shift_en && !drop_bit)
- hold_reg <= {sd_nrzi, hold_reg[7:1]};
-
-///////////////////////////////////////////////////////////////////
-//
-// Generate RxValid
-//
-
-`ifdef USB_ASYNC_REST
-always @(posedge clk or negedge rst)
-`else
-always @(posedge clk)
-`endif
- if(!rst) bit_cnt <= 3'b0;
- else
- if(!shift_en) bit_cnt <= 3'h0;
- else
- if(fs_ce && !drop_bit) bit_cnt <= bit_cnt + 3'h1;
-
-`ifdef USB_ASYNC_REST
-always @(posedge clk or negedge rst)
-`else
-always @(posedge clk)
-`endif
- if(!rst) rx_valid1 <= 1'b0;
- else
- if(fs_ce && !drop_bit && (bit_cnt==3'h7)) rx_valid1 <= 1'b1;
- else
- if(rx_valid1 && fs_ce && !drop_bit) rx_valid1 <= 1'b0;
-
-always @(posedge clk) rx_valid <= !drop_bit & rx_valid1 & fs_ce;
-
-always @(posedge clk) se0_r <= se0;
-
-always @(posedge clk) byte_err <= se0 & !se0_r & (|bit_cnt[2:1]) & rx_active;
-
-endmodule
-
diff --git a/tests/iwls2005/usb_phy/usb_tx_phy.v b/tests/iwls2005/usb_phy/usb_tx_phy.v
deleted file mode 100644
index 7f61ffd3..00000000
--- a/tests/iwls2005/usb_phy/usb_tx_phy.v
+++ /dev/null
@@ -1,465 +0,0 @@
-/////////////////////////////////////////////////////////////////////
-//// ////
-//// USB 1.1 PHY ////
-//// TX ////
-//// ////
-//// ////
-//// Author: Rudolf Usselmann ////
-//// rudi@asics.ws ////
-//// ////
-//// ////
-//// Downloaded from: http://www.opencores.org/cores/usb_phy/ ////
-//// ////
-/////////////////////////////////////////////////////////////////////
-//// ////
-//// Copyright (C) 2000-2002 Rudolf Usselmann ////
-//// www.asics.ws ////
-//// 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: usb_tx_phy.v,v 1.4 2004/10/19 09:29:07 rudi Exp $
-//
-// $Date: 2004/10/19 09:29:07 $
-// $Revision: 1.4 $
-// $Author: rudi $
-// $Locker: $
-// $State: Exp $
-//
-// Change History:
-// $Log: usb_tx_phy.v,v $
-// Revision 1.4 2004/10/19 09:29:07 rudi
-// Fixed DPLL alignment in the rx_phy and bit stuffing errors in the tx_phy (if last bit bit was a stuff bit in a packet it was omitted).
-//
-// Revision 1.3 2003/10/21 05:58:41 rudi
-// usb_rst is no longer or'ed with the incomming reset internally.
-// Now usb_rst is simply an output, the application can decide how
-// to utilize it.
-//
-// Revision 1.2 2003/10/19 17:40:13 rudi
-// - Made core more robust against line noise
-// - Added Error Checking and Reporting
-// (See README.txt for more info)
-//
-// Revision 1.1.1.1 2002/09/16 14:27:02 rudi
-// Created Directory Structure
-//
-//
-//
-//
-//
-//
-//
-
-`include "timescale.v"
-
-module usb_tx_phy(
- clk, rst, fs_ce, phy_mode,
-
- // Transciever Interface
- txdp, txdn, txoe,
-
- // UTMI Interface
- DataOut_i, TxValid_i, TxReady_o
- );
-
-input clk;
-input rst;
-input fs_ce;
-input phy_mode;
-output txdp, txdn, txoe;
-input [7:0] DataOut_i;
-input TxValid_i;
-output TxReady_o;
-
-///////////////////////////////////////////////////////////////////
-//
-// Local Wires and Registers
-//
-
-parameter IDLE = 3'd0,
- SOP = 3'h1,
- DATA = 3'h2,
- EOP1 = 3'h3,
- EOP2 = 3'h4,
- WAIT = 3'h5;
-
-reg TxReady_o;
-reg [2:0] state, next_state;
-reg tx_ready_d;
-reg ld_sop_d;
-reg ld_data_d;
-reg ld_eop_d;
-reg tx_ip;
-reg tx_ip_sync;
-reg [2:0] bit_cnt;
-reg [7:0] hold_reg;
-reg [7:0] hold_reg_d;
-
-reg sd_raw_o;
-wire hold;
-reg data_done;
-reg sft_done;
-reg sft_done_r;
-wire sft_done_e;
-reg ld_data;
-wire eop_done;
-reg [2:0] one_cnt;
-wire stuff;
-reg sd_bs_o;
-reg sd_nrzi_o;
-reg append_eop;
-reg append_eop_sync1;
-reg append_eop_sync2;
-reg append_eop_sync3;
-reg append_eop_sync4;
-reg txdp, txdn;
-reg txoe_r1, txoe_r2;
-reg txoe;
-
-///////////////////////////////////////////////////////////////////
-//
-// Misc Logic
-//
-
-`ifdef USB_ASYNC_REST
-always @(posedge clk or negedge rst)
-`else
-always @(posedge clk)
-`endif
- if(!rst) TxReady_o <= 1'b0;
- else TxReady_o <= tx_ready_d & TxValid_i;
-
-always @(posedge clk) ld_data <= ld_data_d;
-
-///////////////////////////////////////////////////////////////////
-//
-// Transmit in progress indicator
-//
-
-`ifdef USB_ASYNC_REST
-always @(posedge clk or negedge rst)
-`else
-always @(posedge clk)
-`endif
- if(!rst) tx_ip <= 1'b0;
- else
- if(ld_sop_d) tx_ip <= 1'b1;
- else
- if(eop_done) tx_ip <= 1'b0;
-
-`ifdef USB_ASYNC_REST
-always @(posedge clk or negedge rst)
-`else
-always @(posedge clk)
-`endif
- if(!rst) tx_ip_sync <= 1'b0;
- else
- if(fs_ce) tx_ip_sync <= tx_ip;
-
-// data_done helps us to catch cases where TxValid drops due to
-// packet end and then gets re-asserted as a new packet starts.
-// We might not see this because we are still transmitting.
-// data_done should solve those cases ...
-`ifdef USB_ASYNC_REST
-always @(posedge clk or negedge rst)
-`else
-always @(posedge clk)
-`endif
- if(!rst) data_done <= 1'b0;
- else
- if(TxValid_i && ! tx_ip) data_done <= 1'b1;
- else
- if(!TxValid_i) data_done <= 1'b0;
-
-///////////////////////////////////////////////////////////////////
-//
-// Shift Register
-//
-
-`ifdef USB_ASYNC_REST
-always @(posedge clk or negedge rst)
-`else
-always @(posedge clk)
-`endif
- if(!rst) bit_cnt <= 3'h0;
- else
- if(!tx_ip_sync) bit_cnt <= 3'h0;
- else
- if(fs_ce && !hold) bit_cnt <= bit_cnt + 3'h1;
-
-assign hold = stuff;
-
-always @(posedge clk)
- if(!tx_ip_sync) sd_raw_o <= 1'b0;
- else
- case(bit_cnt) // synopsys full_case parallel_case
- 3'h0: sd_raw_o <= hold_reg_d[0];
- 3'h1: sd_raw_o <= hold_reg_d[1];
- 3'h2: sd_raw_o <= hold_reg_d[2];
- 3'h3: sd_raw_o <= hold_reg_d[3];
- 3'h4: sd_raw_o <= hold_reg_d[4];
- 3'h5: sd_raw_o <= hold_reg_d[5];
- 3'h6: sd_raw_o <= hold_reg_d[6];
- 3'h7: sd_raw_o <= hold_reg_d[7];
- endcase
-
-always @(posedge clk)
- sft_done <= !hold & (bit_cnt == 3'h7);
-
-always @(posedge clk)
- sft_done_r <= sft_done;
-
-assign sft_done_e = sft_done & !sft_done_r;
-
-// Out Data Hold Register
-always @(posedge clk)
- if(ld_sop_d) hold_reg <= 8'h80;
- else
- if(ld_data) hold_reg <= DataOut_i;
-
-always @(posedge clk) hold_reg_d <= hold_reg;
-
-///////////////////////////////////////////////////////////////////
-//
-// Bit Stuffer
-//
-
-`ifdef USB_ASYNC_REST
-always @(posedge clk or negedge rst)
-`else
-always @(posedge clk)
-`endif
- if(!rst) one_cnt <= 3'h0;
- else
- if(!tx_ip_sync) one_cnt <= 3'h0;
- else
- if(fs_ce)
- begin
- if(!sd_raw_o || stuff) one_cnt <= 3'h0;
- else one_cnt <= one_cnt + 3'h1;
- end
-
-assign stuff = (one_cnt==3'h6);
-
-`ifdef USB_ASYNC_REST
-always @(posedge clk or negedge rst)
-`else
-always @(posedge clk)
-`endif
- if(!rst) sd_bs_o <= 1'h0;
- else
- if(fs_ce) sd_bs_o <= !tx_ip_sync ? 1'b0 : (stuff ? 1'b0 : sd_raw_o);
-
-///////////////////////////////////////////////////////////////////
-//
-// NRZI Encoder
-//
-
-`ifdef USB_ASYNC_REST
-always @(posedge clk or negedge rst)
-`else
-always @(posedge clk)
-`endif
- if(!rst) sd_nrzi_o <= 1'b1;
- else
- if(!tx_ip_sync || !txoe_r1) sd_nrzi_o <= 1'b1;
- else
- if(fs_ce) sd_nrzi_o <= sd_bs_o ? sd_nrzi_o : ~sd_nrzi_o;
-
-///////////////////////////////////////////////////////////////////
-//
-// EOP append logic
-//
-
-`ifdef USB_ASYNC_REST
-always @(posedge clk or negedge rst)
-`else
-always @(posedge clk)
-`endif
- if(!rst) append_eop <= 1'b0;
- else
- if(ld_eop_d) append_eop <= 1'b1;
- else
- if(append_eop_sync2) append_eop <= 1'b0;
-
-`ifdef USB_ASYNC_REST
-always @(posedge clk or negedge rst)
-`else
-always @(posedge clk)
-`endif
- if(!rst) append_eop_sync1 <= 1'b0;
- else
- if(fs_ce) append_eop_sync1 <= append_eop;
-
-`ifdef USB_ASYNC_REST
-always @(posedge clk or negedge rst)
-`else
-always @(posedge clk)
-`endif
- if(!rst) append_eop_sync2 <= 1'b0;
- else
- if(fs_ce) append_eop_sync2 <= append_eop_sync1;
-
-`ifdef USB_ASYNC_REST
-always @(posedge clk or negedge rst)
-`else
-always @(posedge clk)
-`endif
- if(!rst) append_eop_sync3 <= 1'b0;
- else
- if(fs_ce) append_eop_sync3 <= append_eop_sync2 |
- (append_eop_sync3 & !append_eop_sync4); // Make sure always 2 bit wide
-
-`ifdef USB_ASYNC_REST
-always @(posedge clk or negedge rst)
-`else
-always @(posedge clk)
-`endif
- if(!rst) append_eop_sync4 <= 1'b0;
- else
- if(fs_ce) append_eop_sync4 <= append_eop_sync3;
-
-assign eop_done = append_eop_sync3;
-
-///////////////////////////////////////////////////////////////////
-//
-// Output Enable Logic
-//
-
-`ifdef USB_ASYNC_REST
-always @(posedge clk or negedge rst)
-`else
-always @(posedge clk)
-`endif
- if(!rst) txoe_r1 <= 1'b0;
- else
- if(fs_ce) txoe_r1 <= tx_ip_sync;
-
-`ifdef USB_ASYNC_REST
-always @(posedge clk or negedge rst)
-`else
-always @(posedge clk)
-`endif
- if(!rst) txoe_r2 <= 1'b0;
- else
- if(fs_ce) txoe_r2 <= txoe_r1;
-
-`ifdef USB_ASYNC_REST
-always @(posedge clk or negedge rst)
-`else
-always @(posedge clk)
-`endif
- if(!rst) txoe <= 1'b1;
- else
- if(fs_ce) txoe <= !(txoe_r1 | txoe_r2);
-
-///////////////////////////////////////////////////////////////////
-//
-// Output Registers
-//
-
-`ifdef USB_ASYNC_REST
-always @(posedge clk or negedge rst)
-`else
-always @(posedge clk)
-`endif
- if(!rst) txdp <= 1'b1;
- else
- if(fs_ce) txdp <= phy_mode ?
- (!append_eop_sync3 & sd_nrzi_o) :
- sd_nrzi_o;
-
-`ifdef USB_ASYNC_REST
-always @(posedge clk or negedge rst)
-`else
-always @(posedge clk)
-`endif
- if(!rst) txdn <= 1'b0;
- else
- if(fs_ce) txdn <= phy_mode ?
- (!append_eop_sync3 & ~sd_nrzi_o) :
- append_eop_sync3;
-
-///////////////////////////////////////////////////////////////////
-//
-// Tx Statemashine
-//
-
-`ifdef USB_ASYNC_REST
-always @(posedge clk or negedge rst)
-`else
-always @(posedge clk)
-`endif
- if(!rst) state <= IDLE;
- else state <= next_state;
-
-always @(state or TxValid_i or data_done or sft_done_e or eop_done or fs_ce)
- begin
- next_state = state;
- tx_ready_d = 1'b0;
-
- ld_sop_d = 1'b0;
- ld_data_d = 1'b0;
- ld_eop_d = 1'b0;
-
- case(state) // synopsys full_case parallel_case
- IDLE:
- if(TxValid_i)
- begin
- ld_sop_d = 1'b1;
- next_state = SOP;
- end
- SOP:
- if(sft_done_e)
- begin
- tx_ready_d = 1'b1;
- ld_data_d = 1'b1;
- next_state = DATA;
- end
- DATA:
- begin
- if(!data_done && sft_done_e)
- begin
- ld_eop_d = 1'b1;
- next_state = EOP1;
- end
-
- if(data_done && sft_done_e)
- begin
- tx_ready_d = 1'b1;
- ld_data_d = 1'b1;
- end
- end
- EOP1:
- if(eop_done) next_state = EOP2;
- EOP2:
- if(!eop_done && fs_ce) next_state = WAIT;
- WAIT:
- if(fs_ce) next_state = IDLE;
- endcase
- end
-
-endmodule
-
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-30 23:40:20 +0000