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//======================================================================
//
// 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
//======================================================================
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