Pushing the bulk of UHD-3.7.0 code.

Original-commit: ff1546f8137f7f92bb250f685561b0c34cc0e053

lib/xge/rtl/verilog/tx_enqueue.v

@@ -0,0 +1,179 @@
+//////////////////////////////////////////////////////////////////////
+////                                                              ////
+////  File name "tx_enqueue.v"                                    ////
+////                                                              ////
+////  This file is part of the "10GE MAC" project                 ////
+////  http://www.opencores.org/cores/xge_mac/                     ////
+////                                                              ////
+////  Author(s):                                                  ////
+////      - A. Tanguay (antanguay@opencores.org)                  ////
+////                                                              ////
+//////////////////////////////////////////////////////////////////////
+////                                                              ////
+//// Copyright (C) 2008 AUTHORS. All rights reserved.             ////
+////                                                              ////
+//// 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 "defines.v"
+ 
+module tx_enqueue(/*AUTOARG*/
+  // Outputs
+  pkt_tx_full, txdfifo_wdata, txdfifo_wstatus, txdfifo_wen,
+  status_txdfifo_ovflow_tog,
+  // Inputs
+  clk_156m25, reset_156m25_n, pkt_tx_data, pkt_tx_val, pkt_tx_sop,
+  pkt_tx_eop, pkt_tx_mod, txdfifo_wfull, txdfifo_walmost_full
+  );
+ 
+`include "CRC32_D64.v"
+`include "CRC32_D8.v"
+`include "utils.v"
+ 
+input         clk_156m25;
+input         reset_156m25_n;
+ 
+input  [63:0] pkt_tx_data;
+input         pkt_tx_val;
+input         pkt_tx_sop;
+input         pkt_tx_eop;
+input  [2:0]  pkt_tx_mod;
+ 
+input         txdfifo_wfull;
+input         txdfifo_walmost_full;
+ 
+output        pkt_tx_full;
+ 
+output [63:0] txdfifo_wdata;
+output [7:0]  txdfifo_wstatus;
+output        txdfifo_wen;
+ 
+output        status_txdfifo_ovflow_tog;
+ 
+/*AUTOREG*/
+// Beginning of automatic regs (for this module's undeclared outputs)
+reg                     status_txdfifo_ovflow_tog;
+reg [63:0]              txdfifo_wdata;
+reg                     txdfifo_wen;
+reg [7:0]               txdfifo_wstatus;
+// End of automatics
+ 
+/*AUTOWIRE*/
+ 
+ 
+reg             txd_ovflow;
+reg             next_txd_ovflow;
+ 
+ 
+ 
+// Full status if data fifo is almost full.
+// Current packet can complete transfer since data input rate
+// matches output rate. But next packet must wait for more headroom.
+ 
+assign pkt_tx_full = txdfifo_walmost_full;
+ 
+ 
+ 
+always @(posedge clk_156m25 or negedge reset_156m25_n) begin
+ 
+    if (reset_156m25_n == 1'b0) begin
+ 
+        txd_ovflow <= 1'b0;
+ 
+        status_txdfifo_ovflow_tog <= 1'b0;
+ 
+    end
+    else begin
+ 
+        txd_ovflow <= next_txd_ovflow;
+ 
+        //---
+        // FIFO errors, used to generate interrupts
+ 
+        if (next_txd_ovflow && !txd_ovflow) begin
+            status_txdfifo_ovflow_tog <= ~status_txdfifo_ovflow_tog;
+        end
+ 
+    end
+ 
+end
+ 
+always @(/*AS*/pkt_tx_data or pkt_tx_eop or pkt_tx_mod or pkt_tx_sop
+         or pkt_tx_val or txd_ovflow or txdfifo_wfull) begin
+ 
+    txdfifo_wstatus = `TXSTATUS_NONE;
+    txdfifo_wen = pkt_tx_val;
+ 
+    next_txd_ovflow = txd_ovflow;
+ 
+    `ifdef BIGENDIAN
+    txdfifo_wdata = {pkt_tx_data[7:0], pkt_tx_data[15:8], pkt_tx_data[23:16], pkt_tx_data[31:24],
+                     pkt_tx_data[39:32], pkt_tx_data[47:40], pkt_tx_data[55:48],
+                     pkt_tx_data[63:56]};
+    `else
+    txdfifo_wdata = pkt_tx_data;
+    `endif
+ 
+    // Write SOP marker to fifo.
+ 
+    if (pkt_tx_val && pkt_tx_sop) begin
+ 
+        txdfifo_wstatus[`TXSTATUS_SOP] = 1'b1;
+ 
+    end
+ 
+ 
+    // Write EOP marker to fifo.
+ 
+    if (pkt_tx_val) begin
+ 
+        if (pkt_tx_eop) begin
+            txdfifo_wstatus[2:0] = pkt_tx_mod;
+            txdfifo_wstatus[`TXSTATUS_EOP] = 1'b1;
+        end
+ 
+    end
+ 
+ 
+    // Overflow indication
+ 
+    if (pkt_tx_val) begin
+ 
+        if (txdfifo_wfull) begin
+ 
+            next_txd_ovflow = 1'b1;
+ 
+        end
+        else if (pkt_tx_sop) begin
+ 
+            next_txd_ovflow = 1'b0;
+ 
+        end
+    end
+ 
+end
+ 
+ 
+endmodule
+