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-rw-r--r--src/rtl/coretest_trng.v251
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+//======================================================================
+//
+// coretest_entropy.v
+// -----------------
+// Top level wrapper that creates the Cryptech coretest system.
+// The wrapper contains instances of external interface, coretest
+// and the cores to be tested. And if more than one core is
+// present the wrapper also includes address and data muxes.
+//
+//
+// Author: Joachim Strombergson
+// Copyright (c) 2014, SUNET
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or
+// without modification, are permitted provided that the following
+// conditions are met:
+//
+// 1. Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//
+// 2. 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.
+//
+// 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 OWNER 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 coretest_entropy(
+ input wire clk,
+ input wire reset_n,
+
+ input noise,
+
+ // External interface.
+ input wire SCL,
+ input wire SDA,
+ output wire SDA_pd,
+
+ output wire [7 : 0] debug
+ );
+
+
+ //----------------------------------------------------------------
+ // Internal constant and parameter definitions.
+ //----------------------------------------------------------------
+ parameter I2C_ADDR_PREFIX = 8'h00;
+ parameter TRNG_ADDR_PREFIX = 8'h20;
+
+
+ //----------------------------------------------------------------
+ // Wires.
+ //----------------------------------------------------------------
+ // Coretest connections.
+ wire coretest_reset_n;
+ wire coretest_cs;
+ wire coretest_we;
+ wire [15 : 0] coretest_address;
+ wire [31 : 0] coretest_write_data;
+ reg [31 : 0] coretest_read_data;
+ reg coretest_error;
+
+ // i2c connections
+ wire i2c_rxd_syn;
+ wire [7 : 0] i2c_rxd_data;
+ wire i2c_rxd_ack;
+ wire i2c_txd_syn;
+ wire [7 : 0] i2c_txd_data;
+ wire i2c_txd_ack;
+ reg i2c_cs;
+ reg i2c_we;
+ reg [7 : 0] i2c_address;
+ reg [31 : 0] i2c_write_data;
+ wire [31 : 0] i2c_read_data;
+ wire i2c_error;
+ wire [7 : 0] i2c_debug;
+
+ // trng connections.
+ wire trng_noise
+ reg trng_cs;
+ reg trng_we;
+ reg [7 : 0] trng_address;
+ reg [31 : 0] trng_write_data;
+ wire [31 : 0] trng_read_data;
+ wire trng_error;
+ wire [7 : 0] trng_debug;
+ wire trng_debug_update;
+ wire trng_security_error;
+
+
+ //----------------------------------------------------------------
+ // Concurrent assignment.
+ //----------------------------------------------------------------
+ assign debug = trng_debug;
+ assign trng_debug_update = 1;
+
+
+ //----------------------------------------------------------------
+ // Core instantiations.
+ //----------------------------------------------------------------
+ coretest coretest_inst(
+ .clk(clk),
+ .reset_n(reset_n),
+
+ .rx_syn(i2c_rxd_syn),
+ .rx_data(i2c_rxd_data),
+ .rx_ack(i2c_rxd_ack),
+
+ .tx_syn(i2c_txd_syn),
+ .tx_data(i2c_txd_data),
+ .tx_ack(i2c_txd_ack),
+
+ .core_reset_n(coretest_reset_n),
+ .core_cs(coretest_cs),
+ .core_we(coretest_we),
+ .core_address(coretest_address),
+ .core_write_data(coretest_write_data),
+ .core_read_data(coretest_read_data),
+ .core_error(coretest_error)
+ );
+
+
+ i2c i2c_inst(
+ .clk(clk),
+ .reset_n(!reset_n),
+
+ .SCL(SCL),
+ .SDA(SDA),
+ .SDA_pd(SDA_pd),
+ .i2c_device_addr(8'h1E),
+
+ .rxd_syn(i2c_rxd_syn),
+ .rxd_data(i2c_rxd_data),
+ .rxd_ack(i2c_rxd_ack),
+
+ .txd_syn(i2c_txd_syn),
+ .txd_data(i2c_txd_data),
+ .txd_ack(i2c_txd_ack),
+
+ .cs(i2c_cs),
+ .we(i2c_we),
+ .address(i2c_address),
+ .write_data(i2c_write_data),
+ .read_data(i2c_read_data),
+ .error(i2c_error),
+
+ .debug(i2c_debug)
+ );
+
+
+module trng(
+ // Clock and reset.
+ .clk(clk),
+ .reset_n(reset_n),
+
+ .avalanche_noise(noise),
+
+ .cs(trng_cs),
+ .we(trng_we),
+ .address(trng_address),
+ .write_data(trng_write_data),
+ .read_data(trng_read_data),
+ .error(trng_error),
+
+ .debug(trng_debug),
+ .debug_update(trng_debug_update),
+
+ .security_error(trng_security_error)
+ );
+
+
+ //----------------------------------------------------------------
+ // address_mux
+ //
+ // Combinational data mux that handles addressing between
+ // cores using the 32-bit memory like interface.
+ //----------------------------------------------------------------
+ always @*
+ begin : address_mux
+ // Default assignments.
+ coretest_read_data = 32'h00000000;
+ coretest_error = 0;
+
+ i2c_cs = 0;
+ i2c_we = 0;
+ i2c_address = 8'h00;
+ i2c_write_data = 32'h00000000;
+
+ trng_cs = 0;
+ trng_we = 0;
+ trng_address = 8'h00;
+ trng_write_data = 32'h00000000;
+
+
+ case (coretest_address[15 : 8])
+ I2C_ADDR_PREFIX:
+ begin
+ i2c_cs = coretest_cs;
+ i2c_we = coretest_we;
+ i2c_address = coretest_address[7 : 0];
+ i2c_write_data = coretest_write_data;
+ coretest_read_data = i2c_read_data;
+ coretest_error = i2c_error;
+ end
+
+
+ AVALANCHE_ADDR_PREFIX:
+ begin
+ avalanche_cs = coretest_cs;
+ avalanche_we = coretest_we;
+ avalanche_address = coretest_address[7 : 0];
+ avalanche_write_data = coretest_write_data;
+ coretest_read_data = avalanche_read_data;
+ coretest_error = avalanche_error;
+ end
+
+
+ TRNG_ADDR_PREFIX:
+ begin
+ trng_cs = coretest_cs;
+ trng_we = coretest_we;
+ trng_address = coretest_address[7 : 0];
+ trng_write_data = coretest_write_data;
+ coretest_read_data = trng_read_data;
+ coretest_error = trng_error;
+ end
+
+ default:
+ begin
+ end
+ endcase // case (coretest_address[15 : 8])
+ end // address_mux
+
+endmodule // coretest_entropy
+
+//======================================================================
+// EOF coretest_entropy.v
+//======================================================================