From fd3e84941de463fa1a7ebab0a69515b4bf2614cd Mon Sep 17 00:00:00 2001
From: Martin Braun <martin.braun@ettus.com>
Date: Tue, 7 Oct 2014 11:25:20 +0200
Subject: Removed copy of FPGA source files.

---
 fpga/usrp2/fifo/fifo_2clock.v | 141 ------------------------------------------
 1 file changed, 141 deletions(-)
 delete mode 100644 fpga/usrp2/fifo/fifo_2clock.v

(limited to 'fpga/usrp2/fifo/fifo_2clock.v')

diff --git a/fpga/usrp2/fifo/fifo_2clock.v b/fpga/usrp2/fifo/fifo_2clock.v
deleted file mode 100644
index 98aab18a5..000000000
--- a/fpga/usrp2/fifo/fifo_2clock.v
+++ /dev/null
@@ -1,141 +0,0 @@
-//
-// Copyright 2011-2012 Ettus Research LLC
-//
-// This program is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// This program 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 General Public License for more details.
-//
-// You should have received a copy of the GNU General Public License
-// along with this program.  If not, see <http://www.gnu.org/licenses/>.
-//
-
-
-// FIXME ignores the AWIDTH (fifo size) parameter
-
-module fifo_2clock
-  #(parameter WIDTH=36, SIZE=6)
-   (input wclk, input [WIDTH-1:0] datain, input src_rdy_i, output dst_rdy_o, output [15:0] space,
-    input rclk, output [WIDTH-1:0] dataout, output src_rdy_o, input dst_rdy_i, output [15:0] occupied,
-    input arst);
-   
-   wire [SIZE:0] level_rclk, level_wclk; // xilinx adds an extra bit if you ask for accurate levels
-   wire 	 full, empty, write, read;
-
-   assign dst_rdy_o  = ~full;
-   assign src_rdy_o  = ~empty;
-   assign write      = src_rdy_i & dst_rdy_o;
-   assign read 	     = src_rdy_o & dst_rdy_i;
-
-   generate
-      if((WIDTH <= 36) && (WIDTH > 19)) begin
-	wire [35:0] data_in_wide, data_out_wide;
-	assign data_in_wide[WIDTH-1:0] = datain;
-	assign dataout = data_out_wide[WIDTH-1:0];
-	if(SIZE==9)
-	  fifo_xlnx_512x36_2clk fifo_xlnx_512x36_2clk
-	       (.rst(arst),
-		.wr_clk(wclk),.din(data_in_wide),.full(full),.wr_en(write),.wr_data_count(level_wclk),
-		.rd_clk(rclk),.dout(data_out_wide),.empty(empty),.rd_en(read),.rd_data_count(level_rclk) );
-	else if(SIZE==11)
-	  fifo_xlnx_2Kx36_2clk fifo_xlnx_2Kx36_2clk 
-		     (.rst(arst),
-		      .wr_clk(wclk),.din(data_in_wide),.full(full),.wr_en(write),.wr_data_count(level_wclk),
-		      .rd_clk(rclk),.dout(data_out_wide),.empty(empty),.rd_en(read),.rd_data_count(level_rclk) );
-	else if(SIZE==6)
-	  fifo_xlnx_64x36_2clk fifo_xlnx_64x36_2clk 
-		     (.rst(arst),
-		      .wr_clk(wclk),.din(data_in_wide),.full(full),.wr_en(write),.wr_data_count(level_wclk),
-		      .rd_clk(rclk),.dout(data_out_wide),.empty(empty),.rd_en(read),.rd_data_count(level_rclk) );
-	else
-	  fifo_xlnx_512x36_2clk fifo_xlnx_512x36_2clk
-	       (.rst(arst),
-		.wr_clk(wclk),.din(data_in_wide),.full(full),.wr_en(write),.wr_data_count(level_wclk),
-		.rd_clk(rclk),.dout(data_out_wide),.empty(empty),.rd_en(read),.rd_data_count(level_rclk) );
-      end
-      else if((WIDTH <= 19) && (SIZE <= 4)) begin
-	wire [18:0] data_in_wide, data_out_wide;
-	assign data_in_wide[WIDTH-1:0] = datain;
-	assign dataout = data_out_wide[WIDTH-1:0];
-	fifo_xlnx_16x19_2clk fifo_xlnx_16x19_2clk
-	  (.rst(arst),
-	   .wr_clk(wclk),.din(data_in_wide),.full(full),.wr_en(write),.wr_data_count(level_wclk),
-	   .rd_clk(rclk),.dout(data_out_wide),.empty(empty),.rd_en(read),.rd_data_count(level_rclk) );
-      end
-   endgenerate
-
-   assign occupied  = {{(16-SIZE-1){1'b0}},level_rclk};
-   assign space     = ((1<<SIZE)+1)-level_wclk;
-   
-endmodule // fifo_2clock
-
-/*
-`else
-   // ISE sucks, so the following doesn't work properly
-
-   reg [AWIDTH-1:0] wr_addr, rd_addr;
-   wire [AWIDTH-1:0] wr_addr_rclk, rd_addr_wclk;
-   wire [AWIDTH-1:0] next_rd_addr;
-   wire 	    enb_read;
-   
-   // Write side management
-   wire [AWIDTH-1:0] next_wr_addr = wr_addr + 1;
-   always @(posedge wclk or posedge arst)
-     if(arst)
-       wr_addr <= 0;
-     else if(write)
-       wr_addr <= next_wr_addr;
-   assign 	    full = (next_wr_addr == rd_addr_wclk);
-
-   //  RAM for data storage.  Data out is registered, complicating the
-   //     read side logic
-   ram_2port #(.DWIDTH(DWIDTH),.AWIDTH(AWIDTH)) mac_rx_ff_ram
-     (.clka(wclk),.ena(1'b1),.wea(write),.addra(wr_addr),.dia(datain),.doa(),
-      .clkb(rclk),.enb(enb_read),.web(1'b0),.addrb(next_rd_addr),.dib(0),.dob(dataout) );
-
-   // Read side management
-   reg 		    data_valid;
-   assign 	    empty = ~data_valid;
-   assign 	    next_rd_addr = rd_addr + data_valid;
-   assign 	    enb_read = read | ~data_valid;
-
-   always @(posedge rclk or posedge arst)
-     if(arst)
-       rd_addr <= 0;
-     else if(read)
-       rd_addr <= rd_addr + 1;
-
-   always @(posedge rclk or posedge arst)
-     if(arst)
-       data_valid <= 0;
-     else
-       if(read & (next_rd_addr == wr_addr_rclk))
-	 data_valid <= 0;
-       else if(next_rd_addr != wr_addr_rclk)
-	 data_valid <= 1;
-	 
-   // Send pointers across clock domains via gray code
-   gray_send #(.WIDTH(AWIDTH)) send_wr_addr
-     (.clk_in(wclk),.addr_in(wr_addr),
-      .clk_out(rclk),.addr_out(wr_addr_rclk) );
-   
-   gray_send #(.WIDTH(AWIDTH)) send_rd_addr
-     (.clk_in(rclk),.addr_in(rd_addr),
-      .clk_out(wclk),.addr_out(rd_addr_wclk) );
-
-   // Generate fullness info, these are approximate and may be delayed 
-   // and are only for higher-level flow control.  
-   // Only full and empty are guaranteed exact.
-   always @(posedge wclk) 
-     level_wclk <= wr_addr - rd_addr_wclk;
-   always @(posedge rclk) 
-     level_rclk <= wr_addr_rclk - rd_addr;
-`endif
-endmodule // fifo_2clock
-
-*/
-- 
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