[Cryptech-Commits] [core/math/modexp] 02/02: Adding new memories with internal pointers.
git at cryptech.is
git at cryptech.is
Wed May 20 12:23:40 UTC 2015
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joachim at secworks.se pushed a commit to branch master
in repository core/math/modexp.
commit a8662af84800b95fc143930962203191b6bec2fa
Author: Joachim Strömbergson <joachim at secworks.se>
Date: Wed May 20 14:23:27 2015 +0200
Adding new memories with internal pointers.
---
src/rtl/blockmem2r1wptr.v | 135 ++++++++++++++++++++++++++++++++++++++++++++++
src/rtl/blockmem2rptr1w.v | 134 +++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 269 insertions(+)
diff --git a/src/rtl/blockmem2r1wptr.v b/src/rtl/blockmem2r1wptr.v
new file mode 100644
index 0000000..41efc85
--- /dev/null
+++ b/src/rtl/blockmem2r1wptr.v
@@ -0,0 +1,135 @@
+//======================================================================
+//
+// blockmem2r1wptr.v
+// -----------------
+// Synchronous block memory with two read ports and one write port.
+// For port 1 the address is implicit and instead given by the
+// internal pointer. The pointer is automatically increased
+// when the cs signal is set. The pointer is reset to zero when
+// the rst signal is asserted.
+//
+// The memory is used in the modexp core.
+//
+//
+// Author: Joachim Strombergson
+// Copyright (c) 2015, 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.
+//
+//======================================================================
+
+module blockmem2r1wptr(
+ input wire clk,
+ input wire reset_n,
+
+ input wire [07 : 0] read_addr0,
+ output wire [31 : 0] read_data0,
+
+ output wire [31 : 0] read_data1,
+
+ input wire rst,
+ input wire cs,
+ input wire wr,
+ input wire [31 : 0] write_data
+ );
+
+
+ //----------------------------------------------------------------
+ // Memories and regs including update variables and write enable.
+ //----------------------------------------------------------------
+ reg [31 : 0] mem [0 : 255];
+ reg [31 : 0] tmp_read_data0;
+ reg [31 : 0] tmp_read_data1;
+
+ reg [7 : 0] ptr_reg;
+ reg [7 : 0] ptr_new;
+ reg ptr_we;
+
+
+ //----------------------------------------------------------------
+ // Concurrent connectivity for ports etc.
+ //----------------------------------------------------------------
+ assign read_data0 = tmp_read_data0;
+ assign read_data1 = tmp_read_data1;
+
+
+ //----------------------------------------------------------------
+ // mem_update
+ //
+ // Clocked update of memory This should cause
+ // the memory to be implemented as a block memory.
+ //----------------------------------------------------------------
+ always @ (posedge clk)
+ begin : mem_update
+ if (wr)
+ mem[ptr_reg] <= write_data;
+
+ tmp_read_data0 <= mem[read_addr0];
+ tmp_read_data1 <= mem[ptr_reg];
+ end
+
+
+ //----------------------------------------------------------------
+ // reg_update
+ //----------------------------------------------------------------
+ always @ (posedge clk or negedge reset_n)
+ begin : reg_mem_update
+ if (!reset_n)
+ ptr_reg <= 8'h00;
+
+ else
+ if (ptr_we)
+ ptr_reg <= ptr_new;
+ end
+
+
+ //----------------------------------------------------------------
+ // ptr_logic
+ //----------------------------------------------------------------
+ always @*
+ begin : ptr_logic
+ ptr_new = 8'h00;
+ ptr_we = 1'b0;
+
+ if (rst)
+ begin
+ ptr_new = 8'h00;
+ ptr_we = 1'b1;
+ end
+
+ if (cs)
+ begin
+ ptr_new = ptr_reg + 1'b1;
+ ptr_we = 1'b1;
+ end
+ end
+
+endmodule // blockmem2r1wptr
+
+//======================================================================
+// EOF blockmem2r1wptr.v
+//======================================================================
diff --git a/src/rtl/blockmem2rptr1w.v b/src/rtl/blockmem2rptr1w.v
new file mode 100644
index 0000000..4eb529e
--- /dev/null
+++ b/src/rtl/blockmem2rptr1w.v
@@ -0,0 +1,134 @@
+//======================================================================
+//
+// blockmem2r1wptr.v
+// -----------------
+// Synchronous block memory with two read ports and one write port.
+// For port 1 the address is implicit and instead given by the
+// internal pointer. But write address is explicitly given.
+//
+// The memory is used in the modexp core.
+//
+//
+// Author: Joachim Strombergson
+// Copyright (c) 2015, 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.
+//
+//======================================================================
+
+module blockmem2rptr1w(
+ input wire clk,
+ input wire reset_n,
+
+ input wire [07 : 0] read_addr0,
+ output wire [31 : 0] read_data0,
+
+ output wire [31 : 0] read_data1,
+
+ input wire rst,
+ input wire cs,
+ input wire wr,
+ input wire [07 : 0] write_addr,
+ input wire [31 : 0] write_data
+ );
+
+
+ //----------------------------------------------------------------
+ // Memories and regs including update variables and write enable.
+ //----------------------------------------------------------------
+ reg [31 : 0] mem [0 : 255];
+ reg [31 : 0] tmp_read_data0;
+ reg [31 : 0] tmp_read_data1;
+
+ reg [7 : 0] ptr_reg;
+ reg [7 : 0] ptr_new;
+ reg ptr_we;
+
+
+ //----------------------------------------------------------------
+ // Concurrent connectivity for ports etc.
+ //----------------------------------------------------------------
+ assign read_data0 = tmp_read_data0;
+ assign read_data1 = tmp_read_data1;
+
+
+ //----------------------------------------------------------------
+ // mem_update
+ //
+ // Clocked update of memory This should cause
+ // the memory to be implemented as a block memory.
+ //----------------------------------------------------------------
+ always @ (posedge clk)
+ begin : mem_update
+ if (wr)
+ mem[write_addr] <= write_data;
+
+ tmp_read_data0 <= mem[read_addr0];
+ tmp_read_data1 <= mem[ptr_reg];
+ end
+
+
+ //----------------------------------------------------------------
+ // reg_update
+ //----------------------------------------------------------------
+ always @ (posedge clk or negedge reset_n)
+ begin : reg_mem_update
+ if (!reset_n)
+ ptr_reg <= 8'h00;
+
+ else
+ if (ptr_we)
+ ptr_reg <= ptr_new;
+ end
+
+
+ //----------------------------------------------------------------
+ // ptr_logic
+ //----------------------------------------------------------------
+ always @*
+ begin : ptr_logic
+ ptr_new = 8'h00;
+ ptr_we = 1'b0;
+
+ if (rst)
+ begin
+ ptr_new = 8'h00;
+ ptr_we = 1'b1;
+ end
+
+ if (cs)
+ begin
+ ptr_new = ptr_reg + 1'b1;
+ ptr_we = 1'b1;
+ end
+ end
+
+endmodule // blockmem2r1wptr
+
+//======================================================================
+// EOF blockmem2r1wptr.v
+//======================================================================
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