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Diffstat (limited to 'src/rtl/coretest_entropy.v')
| -rw-r--r-- | src/rtl/coretest_entropy.v | 332 |
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diff --git a/src/rtl/coretest_entropy.v b/src/rtl/coretest_entropy.v new file mode 100644 index 0000000..17732a3 --- /dev/null +++ b/src/rtl/coretest_entropy.v @@ -0,0 +1,332 @@ +//====================================================================== +// +// 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 AVALANCHE_ADDR_PREFIX = 8'h20; + parameter ROSC_ADDR_PREFIX = 8'h30; + + + //---------------------------------------------------------------- + // 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; + + // sha1 connections. + reg sha1_cs; + reg sha1_we; + reg [7 : 0] sha1_address; + reg [31 : 0] sha1_write_data; + wire [31 : 0] sha1_read_data; + wire sha1_error; + wire [7 : 0] sha1_debug; + + // Avalanche noise based entropy provider connections. + wire avalanche_noise; + reg avalanche_cs; + reg avalanche_we; + reg [7 : 0] avalanche_address; + reg [31 : 0] avalanche_write_data; + wire [31 : 0] avalanche_read_data; + wire avalanche_error; + wire [7 : 0] avalanche_debug; + wire avalanche_debug_update; + wire avalanche_discard; + wire avalanche_test_mode; + wire avalanche_security_error; + wire avalanche_entropy_enabled; + wire [31 : 0] avalanche_entropy_data; + wire avalanche_entropy_valid; + wire avalanche_entropy_ack; + + + // ROSC based entropy providr connections. + reg rosc_cs; + reg rosc_we; + reg [7 : 0] rosc_address; + reg [31 : 0] rosc_write_data; + wire [31 : 0] rosc_read_data; + wire rosc_error; + wire [7 : 0] rosc_debug; + wire rosc_debug_update; + wire rosc_discard; + wire rosc_test_mode; + wire rosc_security_error; + wire rosc_entropy_enabled; + wire [31 : 0] rosc_entropy_data; + wire rosc_entropy_valid; + wire rosc_entropy_ack; + + + //---------------------------------------------------------------- + // Concurrent assignment. + //---------------------------------------------------------------- + assign debug = i2c_debug; + + assign avalanche_noise = noise; + assign avalanche_discard = 0; + assign avalanche_test_mode = 0; + assign avalanche_entropy_ack = 1; + assign avalanche_debug_update = 1; + + assign rosc_discard = 0; + assign rosc_test_mode = 0; + assign rosc_entropy_ack = 1; + assign rosc_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) + ); + + + avalanche_entropy avalanche_inst( + .clk(clk), + .reset_n(reset_n), + + .noise(avalanche_noise), + + .cs(avalanche_cs), + .we(avalanche_we), + .address(avalanche_address), + .write_data(avalanche_write_data), + .read_data(avalanche_read_data), + .error(avalanche_error), + + .discard(avalanche_discard), + .test_mode(avalanche_test_mode), + .security_error(avalanche_security_error), + + .entropy_enabled(avalanche_entropy_enabled), + .entropy_data(avalanche_entropy_data), + .entropy_valid(avalanche_entropy_valid), + .entropy_ack(avalanche_entropy_ack), + + .debug(avalanche_debug), + .debug_update(avalanche_debug_update) + ); + + + rosc_entropy rosc_inst( + .clk(clk), + .reset_n(reset_n), + + .cs(rosc_cs), + .we(rosc_we), + .address(rosc_address), + .write_data(rosc_write_data), + .read_data(rosc_read_data), + .error(rosc_error), + + .discard(rosc_discard), + .test_mode(rosc_test_mode), + .security_error(rosc_security_error), + + .entropy_enabled(rosc_entropy_enabled), + .entropy_data(rosc_entropy_data), + .entropy_valid(rosc_entropy_valid), + .entropy_ack(rosc_entropy_ack), + + .debug(rosc_debug), + .debug_update(rosc_debug_update) + ); + + + //---------------------------------------------------------------- + // 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; + + avalanche_cs = 0; + avalanche_we = 0; + avalanche_address = 8'h00; + avalanche_write_data = 32'h00000000; + + rosc_cs = 0; + rosc_we = 0; + rosc_address = 8'h00; + rosc_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 + + + ROSC_ADDR_PREFIX: + begin + rosc_cs = coretest_cs; + rosc_we = coretest_we; + rosc_address = coretest_address[7 : 0]; + rosc_write_data = coretest_write_data; + coretest_read_data = rosc_read_data; + coretest_error = rosc_error; + end + + + default: + begin + end + endcase // case (coretest_address[15 : 8]) + end // address_mux + +endmodule // coretest_entropy + +//====================================================================== +// EOF coretest_entropy.v +//====================================================================== |