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Diffstat (limited to 'src')
| -rw-r--r-- | src/rtl/coretest_fpga_entropy.v | 220 |
1 files changed, 220 insertions, 0 deletions
diff --git a/src/rtl/coretest_fpga_entropy.v b/src/rtl/coretest_fpga_entropy.v new file mode 100644 index 0000000..3b76820 --- /dev/null +++ b/src/rtl/coretest_fpga_entropy.v @@ -0,0 +1,220 @@ +//====================================================================== +// +// coretest_fpga_entropy.v +// ----------------------- +// Top level module for the FPGA entropy source tester. +// +// +// Author: Joachim Strombergson +// Copyright (c) 2014 Secworks Sweden AB +// 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_fpga_entropy( + input wire clk, + input wire reset_n, + + // External interface. + input wire rxd, + output wire txd, + + output wire [7 : 0] debug + ); + + + //---------------------------------------------------------------- + // Internal constant and parameter definitions. + //---------------------------------------------------------------- + parameter UART_ADDR_PREFIX = 8'h00; + parameter ENT_ADDR_PREFIX = 8'h10; + + + //---------------------------------------------------------------- + // 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; + + // uart connections + wire uart_rxd_syn; + wire [7 : 0] uart_rxd_data; + wire uart_rxd_ack; + wire uart_txd_syn; + wire [7 : 0] uart_txd_data; + wire uart_txd_ack; + reg uart_cs; + reg uart_we; + reg [7 : 0] uart_address; + reg [31 : 0] uart_write_data; + wire [31 : 0] uart_read_data; + wire uart_error; + wire [7 : 0] uart_debug; + + reg ent_cs; + reg ent_we; + reg [7 : 0] ent_address; + reg [31 : 0] ent_write_data; + wire [31 : 0] ent_read_data; + wire ent_error; + wire [7 : 0] ent_debug; + + + //---------------------------------------------------------------- + // Concurrent assignment. + //---------------------------------------------------------------- + assign debug = ent_debug; + + + //---------------------------------------------------------------- + // Core instantiations. + //---------------------------------------------------------------- + coretest coretest( + .clk(clk), + .reset_n(reset_n), + + .rx_syn(uart_rxd_syn), + .rx_data(uart_rxd_data), + .rx_ack(uart_rxd_ack), + + .tx_syn(uart_txd_syn), + .tx_data(uart_txd_data), + .tx_ack(uart_txd_ack), + + // Interface to the core being tested. + .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) + ); + + + uart uart( + .clk(clk), + .reset_n(reset_n), + + .rxd(rxd), + .txd(txd), + + .rxd_syn(uart_rxd_syn), + .rxd_data(uart_rxd_data), + .rxd_ack(uart_rxd_ack), + + .txd_syn(uart_txd_syn), + .txd_data(uart_txd_data), + .txd_ack(uart_txd_ack), + + .cs(uart_cs), + .we(uart_we), + .address(uart_address), + .write_data(uart_write_data), + .read_data(uart_read_data), + .error(uart_error), + + .debug(uart_debug) + ); + + + fpga_entropy entropy( + .clk(clk), + .reset_n(reset_n), + + .cs(ent_cs), + .we(ent_we), + .address(ent_address), + .write_data(ent_write_data), + .read_data(ent_read_data), + .error(ent_error), + + .debug(ent_debug) + ); + + + //---------------------------------------------------------------- + // 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; + + uart_cs = 0; + uart_we = 0; + uart_address = 8'h00; + uart_write_data = 32'h00000000; + + ent_cs = 0; + ent_we = 0; + ent_address = 8'h00; + ent_write_data = 32'h00000000; + + case (coretest_address[15 : 8]) + UART_ADDR_PREFIX: + begin + uart_cs = coretest_cs; + uart_we = coretest_we; + uart_address = coretest_address[7 : 0]; + uart_write_data = coretest_write_data; + coretest_read_data = uart_read_data; + coretest_error = uart_error; + end + + ENT_ADDR_PREFIX: + begin + ent_cs = coretest_cs; + ent_we = coretest_we; + ent_address = coretest_address[7 : 0]; + ent_write_data = coretest_write_data; + coretest_read_data = ent_read_data; + coretest_error = ent_error; + end + + default: + begin + end + endcase // case (coretest_address[15 : 8]) + end // address_mux + +endmodule // coretest_fpga_entropy + +//====================================================================== +// EOF coretest_fpga_entropy.v +//====================================================================== |