* Rewritten from scratch, uses the same hardware architecture as the Ed25519HEADmaster

   core for better timing performance

 * Removed custom modular inversion sub-module, now uses micro-coded modular
   inversion routine based on Fermat's little theorem (~10% faster)

 * Uses math primitives from core/lib

 * Added randomized test vector
  (see user/shatov/ecdsa_fpga_model/test_vectors/)

8 files changed, 0 insertions, 546 deletions

diff --git a/rtl/curve/rom/brom_p256_delta.v b/rtl/curve/rom/brom_p256_delta.v
deleted file mode 100644
index 4637575..0000000
--- a/rtl/curve/rom/brom_p256_delta.v
+++ /dev/null
@@ -1,68 +0,0 @@
-//======================================================================
-//
-// Copyright (c) 2016, NORDUnet A/S All rights reserved.
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions
-// are met:
-// - Redistributions of source code must retain the above copyright
-//   notice, this list of conditions and the following disclaimer.
-//
-// - Redistributions in binary form must reproduce the above copyright
-//   notice, this list of conditions and the following disclaimer in the
-//   documentation and/or other materials provided with the distribution.
-//
-// - Neither the name of the NORDUnet nor the names of its contributors may
-//   be used to endorse or promote products derived from this software
-//   without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
-// IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
-// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
-// PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// HOLDER 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.
-//
-//======================================================================
-
-`timescale 1ns / 1ps
-
-module brom_p256_delta
-  (
-   input wire 		clk,
-   input wire [ 3-1:0] 	b_addr,
-   output wire [32-1:0] b_out
-   );
-
-
-   //
-   // Output Registers
-   //
-   reg [31:0] 		bram_reg_b;
-
-   assign b_out = bram_reg_b;
-
-
-   //
-   // Read-Only Port B
-   //
-   always @(posedge clk)
-     //
-     case (b_addr)
-       3'b000:	bram_reg_b <= 32'h00000000;
-       3'b001:	bram_reg_b <= 32'h00000000;
-       3'b010:	bram_reg_b <= 32'h80000000;
-       3'b011:	bram_reg_b <= 32'h00000000;
-       3'b100:	bram_reg_b <= 32'h00000000;
-       3'b101:	bram_reg_b <= 32'h80000000;
-       3'b110:	bram_reg_b <= 32'h80000000;
-       3'b111:	bram_reg_b <= 32'h7fffffff;
-     endcase
-
-
-endmodule
diff --git a/rtl/curve/rom/brom_p256_g_x.v b/rtl/curve/rom/brom_p256_g_x.v
deleted file mode 100644
index 86aeafd..0000000
--- a/rtl/curve/rom/brom_p256_g_x.v
+++ /dev/null
@@ -1,68 +0,0 @@
-//======================================================================
-//
-// Copyright (c) 2016, NORDUnet A/S All rights reserved.
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions
-// are met:
-// - Redistributions of source code must retain the above copyright
-//   notice, this list of conditions and the following disclaimer.
-//
-// - Redistributions in binary form must reproduce the above copyright
-//   notice, this list of conditions and the following disclaimer in the
-//   documentation and/or other materials provided with the distribution.
-//
-// - Neither the name of the NORDUnet nor the names of its contributors may
-//   be used to endorse or promote products derived from this software
-//   without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
-// IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
-// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
-// PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// HOLDER 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.
-//
-//======================================================================
-
-`timescale 1ns / 1ps
-
-module brom_p256_g_x
-  (
-   input wire 		clk,
-   input wire [ 3-1:0] 	b_addr,
-   output wire [32-1:0] b_out
-   );
-
-
-   //
-   // Output Registers
-   //
-   reg [31:0] 		bram_reg_b;
-
-   assign b_out = bram_reg_b;
-
-
-   //
-   // Read-Only Port B
-   //
-   always @(posedge clk)
-     //
-     case (b_addr)
-       3'b000:	bram_reg_b <= 32'hd898c296;
-       3'b001:	bram_reg_b <= 32'hf4a13945;
-       3'b010:	bram_reg_b <= 32'h2deb33a0;
-       3'b011:	bram_reg_b <= 32'h77037d81;
-       3'b100:	bram_reg_b <= 32'h63a440f2;
-       3'b101:	bram_reg_b <= 32'hf8bce6e5;
-       3'b110:	bram_reg_b <= 32'he12c4247;
-       3'b111:	bram_reg_b <= 32'h6b17d1f2;
-     endcase
-
-
-endmodule
diff --git a/rtl/curve/rom/brom_p256_g_y.v b/rtl/curve/rom/brom_p256_g_y.v
deleted file mode 100644
index 39f9116..0000000
--- a/rtl/curve/rom/brom_p256_g_y.v
+++ /dev/null
@@ -1,68 +0,0 @@
-//======================================================================
-//
-// Copyright (c) 2016, NORDUnet A/S All rights reserved.
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions
-// are met:
-// - Redistributions of source code must retain the above copyright
-//   notice, this list of conditions and the following disclaimer.
-//
-// - Redistributions in binary form must reproduce the above copyright
-//   notice, this list of conditions and the following disclaimer in the
-//   documentation and/or other materials provided with the distribution.
-//
-// - Neither the name of the NORDUnet nor the names of its contributors may
-//   be used to endorse or promote products derived from this software
-//   without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
-// IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
-// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
-// PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// HOLDER 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.
-//
-//======================================================================
-
-`timescale 1ns / 1ps
-
-module brom_p256_g_y
-  (
-   input wire 		clk,
-   input wire [ 3-1:0] 	b_addr,
-   output wire [32-1:0] b_out
-   );
-
-
-   //
-   // Output Registers
-   //
-   reg [31:0] 		bram_reg_b;
-
-   assign b_out = bram_reg_b;
-
-
-   //
-   // Read-Only Port B
-   //
-   always @(posedge clk)
-     //
-     case (b_addr)
-       3'b000:	bram_reg_b <= 32'h37bf51f5;
-       3'b001:	bram_reg_b <= 32'hcbb64068;
-       3'b010:	bram_reg_b <= 32'h6b315ece;
-       3'b011:	bram_reg_b <= 32'h2bce3357;
-       3'b100:	bram_reg_b <= 32'h7c0f9e16;
-       3'b101:	bram_reg_b <= 32'h8ee7eb4a;
-       3'b110:	bram_reg_b <= 32'hfe1a7f9b;
-       3'b111:	bram_reg_b <= 32'h4fe342e2;
-     endcase
-
-
-endmodule
diff --git a/rtl/curve/rom/brom_p256_h_x.v b/rtl/curve/rom/brom_p256_h_x.v
deleted file mode 100644
index f426475..0000000
--- a/rtl/curve/rom/brom_p256_h_x.v
+++ /dev/null
@@ -1,68 +0,0 @@
-//======================================================================
-//
-// Copyright (c) 2016, NORDUnet A/S All rights reserved.
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions
-// are met:
-// - Redistributions of source code must retain the above copyright
-//   notice, this list of conditions and the following disclaimer.
-//
-// - Redistributions in binary form must reproduce the above copyright
-//   notice, this list of conditions and the following disclaimer in the
-//   documentation and/or other materials provided with the distribution.
-//
-// - Neither the name of the NORDUnet nor the names of its contributors may
-//   be used to endorse or promote products derived from this software
-//   without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
-// IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
-// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
-// PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// HOLDER 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.
-//
-//======================================================================
-
-`timescale 1ns / 1ps
-
-module brom_p256_h_x
-   (
-		input		wire				clk,
-		input		wire	[ 3-1:0]	b_addr,
-		output	wire	[32-1:0]	b_out
-    );
-
-
-   //
-   // Output Registers
-   //
-   reg [31:0] bram_reg_b;
-
-   assign b_out = bram_reg_b;
-
-
-   //
-   // Read-Only Port B
-	//
-	always @(posedge clk)
-		//
-		case (b_addr)
-			3'b000:	bram_reg_b <= 32'h47669978;
-			3'b001:	bram_reg_b <= 32'ha60b48fc;
-			3'b010:	bram_reg_b <= 32'h77f21b35;
-			3'b011:	bram_reg_b <= 32'hc08969e2;
-			3'b100:	bram_reg_b <= 32'h04b51ac3;
-			3'b101:	bram_reg_b <= 32'h8a523803;
-			3'b110:	bram_reg_b <= 32'h8d034f7e;
-			3'b111:	bram_reg_b <= 32'h7cf27b18;
-		endcase
-
-
-endmodule
diff --git a/rtl/curve/rom/brom_p256_h_y.v b/rtl/curve/rom/brom_p256_h_y.v
deleted file mode 100644
index c75d0da..0000000
--- a/rtl/curve/rom/brom_p256_h_y.v
+++ /dev/null
@@ -1,68 +0,0 @@
-//======================================================================
-//
-// Copyright (c) 2016, NORDUnet A/S All rights reserved.
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions
-// are met:
-// - Redistributions of source code must retain the above copyright
-//   notice, this list of conditions and the following disclaimer.
-//
-// - Redistributions in binary form must reproduce the above copyright
-//   notice, this list of conditions and the following disclaimer in the
-//   documentation and/or other materials provided with the distribution.
-//
-// - Neither the name of the NORDUnet nor the names of its contributors may
-//   be used to endorse or promote products derived from this software
-//   without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
-// IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
-// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
-// PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// HOLDER 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.
-//
-//======================================================================
-
-`timescale 1ns / 1ps
-
-module brom_p256_h_y
-   (
-		input		wire				clk,
-		input		wire	[ 3-1:0]	b_addr,
-		output	wire	[32-1:0]	b_out
-    );
-
-
-   //
-   // Output Registers
-   //
-   reg [31:0] bram_reg_b;
-
-   assign b_out = bram_reg_b;
-
-
-   //
-   // Read-Only Port B
-	//
-	always @(posedge clk)
-		//
-		case (b_addr)
-			3'b000:	bram_reg_b <= 32'h227873d1;
-			3'b001:	bram_reg_b <= 32'h9e04b79d;
-			3'b010:	bram_reg_b <= 32'h3ce98229;
-			3'b011:	bram_reg_b <= 32'hba7dade6;
-			3'b100:	bram_reg_b <= 32'h9f7430db;
-			3'b101:	bram_reg_b <= 32'h293d9ac6;
-			3'b110:	bram_reg_b <= 32'hdb8ed040;
-			3'b111:	bram_reg_b <= 32'h07775510;
-		endcase
-		
-
-endmodule
diff --git a/rtl/curve/rom/brom_p256_one.v b/rtl/curve/rom/brom_p256_one.v
deleted file mode 100644
index 15e3746..0000000
--- a/rtl/curve/rom/brom_p256_one.v
+++ /dev/null
@@ -1,68 +0,0 @@
-//======================================================================
-//
-// Copyright (c) 2016, NORDUnet A/S All rights reserved.
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions
-// are met:
-// - Redistributions of source code must retain the above copyright
-//   notice, this list of conditions and the following disclaimer.
-//
-// - Redistributions in binary form must reproduce the above copyright
-//   notice, this list of conditions and the following disclaimer in the
-//   documentation and/or other materials provided with the distribution.
-//
-// - Neither the name of the NORDUnet nor the names of its contributors may
-//   be used to endorse or promote products derived from this software
-//   without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
-// IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
-// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
-// PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// HOLDER 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.
-//
-//======================================================================
-
-`timescale 1ns / 1ps
-
-module brom_p256_one
-  (
-   input wire 		clk,
-   input wire [ 3-1:0] 	b_addr,
-   output wire [32-1:0] b_out
-   );
-
-
-   //
-   // Output Registers
-   //
-   reg [31:0] 		bram_reg_b;
-
-   assign b_out = bram_reg_b;
-
-
-   //
-   // Read-Only Port B
-   //
-   always @(posedge clk)
-     //
-     case (b_addr)
-       3'b000:	bram_reg_b <= 32'h00000001;
-       3'b001:	bram_reg_b <= 32'h00000000;
-       3'b010:	bram_reg_b <= 32'h00000000;
-       3'b011:	bram_reg_b <= 32'h00000000;
-       3'b100:	bram_reg_b <= 32'h00000000;
-       3'b101:	bram_reg_b <= 32'h00000000;
-       3'b110:	bram_reg_b <= 32'h00000000;
-       3'b111:	bram_reg_b <= 32'h00000000;
-     endcase
-
-
-endmodule
diff --git a/rtl/curve/rom/brom_p256_q.v b/rtl/curve/rom/brom_p256_q.v
deleted file mode 100644
index 101a524..0000000
--- a/rtl/curve/rom/brom_p256_q.v
+++ /dev/null
@@ -1,68 +0,0 @@
-//======================================================================
-//
-// Copyright (c) 2016, NORDUnet A/S All rights reserved.
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions
-// are met:
-// - Redistributions of source code must retain the above copyright
-//   notice, this list of conditions and the following disclaimer.
-//
-// - Redistributions in binary form must reproduce the above copyright
-//   notice, this list of conditions and the following disclaimer in the
-//   documentation and/or other materials provided with the distribution.
-//
-// - Neither the name of the NORDUnet nor the names of its contributors may
-//   be used to endorse or promote products derived from this software
-//   without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
-// IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
-// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
-// PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// HOLDER 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.
-//
-//======================================================================
-
-`timescale 1ns / 1ps
-
-module brom_p256_q
-  (
-   input wire 		clk,
-   input wire [ 3-1:0] 	b_addr,
-   output wire [32-1:0] b_out
-   );
-
-
-   //
-   // Output Registers
-   //
-   reg [31:0] 		bram_reg_b;
-
-   assign b_out = bram_reg_b;
-
-
-   //
-   // Read-Only Port B
-   //
-   always @(posedge clk)
-     //
-     case (b_addr)
-       3'b000:	bram_reg_b <= 32'hffffffff;
-       3'b001:	bram_reg_b <= 32'hffffffff;
-       3'b010:	bram_reg_b <= 32'hffffffff;
-       3'b011:	bram_reg_b <= 32'h00000000;
-       3'b100:	bram_reg_b <= 32'h00000000;
-       3'b101:	bram_reg_b <= 32'h00000000;
-       3'b110:	bram_reg_b <= 32'h00000001;
-       3'b111:	bram_reg_b <= 32'hffffffff;
-     endcase
-
-
-endmodule
diff --git a/rtl/curve/rom/brom_p256_zero.v b/rtl/curve/rom/brom_p256_zero.v
deleted file mode 100644
index 2672cf2..0000000
--- a/rtl/curve/rom/brom_p256_zero.v
+++ /dev/null
@@ -1,70 +0,0 @@
-//======================================================================
-//
-// Copyright (c) 2016, NORDUnet A/S All rights reserved.
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions
-// are met:
-// - Redistributions of source code must retain the above copyright
-//   notice, this list of conditions and the following disclaimer.
-//
-// - Redistributions in binary form must reproduce the above copyright
-//   notice, this list of conditions and the following disclaimer in the
-//   documentation and/or other materials provided with the distribution.
-//
-// - Neither the name of the NORDUnet nor the names of its contributors may
-//   be used to endorse or promote products derived from this software
-//   without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
-// IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
-// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
-// PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// HOLDER 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.
-//
-//======================================================================
-
-`timescale 1ns / 1ps
-
-module brom_p256_zero
-  (
-   //input		wire			clk,
-   //input		wire	[ 3-1:0]	b_addr,
-   output wire [32-1:0] b_out
-   );
-
-
-   assign b_out = {32{1'b0}};
-
-   //
-   // Output Registers
-   //
-   //reg [31:0] bram_reg_b;
-
-   //assign b_out = bram_reg_b;
-
-
-   //
-   // Read-Only Port B
-   //
-   //always @(posedge clk)
-   //
-   //case (b_addr)
-   //3'b000:	bram_reg_b <= 32'h00000000;
-   //3'b001:	bram_reg_b <= 32'h00000000;
-   //3'b010:	bram_reg_b <= 32'h00000000;
-   //3'b011:	bram_reg_b <= 32'h00000000;
-   //3'b100:	bram_reg_b <= 32'h00000000;
-   //3'b101:	bram_reg_b <= 32'h00000000;
-   //3'b110:	bram_reg_b <= 32'h00000000;
-   //3'b111:	bram_reg_b <= 32'h00000000;
-   //endcase
-
-
-endmodule