diff options
Diffstat (limited to 'tests/iwls2005/usb_phy/usb_rx_phy.v')
-rw-r--r-- | tests/iwls2005/usb_phy/usb_rx_phy.v | 452 |
1 files changed, 0 insertions, 452 deletions
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 - |