diff options
Diffstat (limited to 'src/rtl')
| -rw-r--r-- | src/rtl/avalanche_entropy.v | 46 | ||||
| -rw-r--r-- | src/rtl/avalanche_entropy_core.v | 174 |
2 files changed, 75 insertions, 145 deletions
diff --git a/src/rtl/avalanche_entropy.v b/src/rtl/avalanche_entropy.v index a7a23b1..bc3a815 100644 --- a/src/rtl/avalanche_entropy.v +++ b/src/rtl/avalanche_entropy.v @@ -12,33 +12,33 @@ // // // Author: Joachim Strombergson -// Copyright (c) 2013, 2014, Secworks Sweden AB -// All rights reserved. +// Copyright (c) 2014, 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: +// 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. // -// 1. 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. // -// 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. +// - 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 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. +// 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. // //====================================================================== diff --git a/src/rtl/avalanche_entropy_core.v b/src/rtl/avalanche_entropy_core.v index 6269d04..5f217af 100644 --- a/src/rtl/avalanche_entropy_core.v +++ b/src/rtl/avalanche_entropy_core.v @@ -70,8 +70,7 @@ module avalanche_entropy_core( parameter ADDR_ENTROPY = 8'h10; parameter ADDR_DELTA = 8'h20; - parameter LED_RATE = 32'h00300000; - parameter SECONDS_RATE = 32'h02faf080; + parameter DEBUG_DELAY = 32'h002c4b40; //---------------------------------------------------------------- @@ -97,21 +96,6 @@ module avalanche_entropy_core( reg bit_ctr_inc; reg bit_ctr_we; - reg [3 : 0] debug_ctr_reg; - reg [3 : 0] debug_ctr_new; - reg debug_ctr_inc; - reg debug_ctr_we; - - reg debug_clk_reg; - reg debug_clk_new; - - reg [7 : 0] led_reg; - reg [7 : 0] led_new; - reg led_we; - - reg [31 : 0] led_ctr_reg; - reg [31 : 0] led_ctr_new; - reg [31 : 0] cycle_ctr_reg; reg [31 : 0] cycle_ctr_new; @@ -121,12 +105,19 @@ module avalanche_entropy_core( reg delta_clk_reg; reg delta_clk_new; + reg [31 : 0] debug_delay_ctr_reg; + reg [31 : 0] debug_delay_ctr_new; + reg debug_delay_ctr_we; + + reg [7 : 0] debug_reg; + reg debug_we; + + reg debug_update_reg; + //---------------------------------------------------------------- // Wires. //---------------------------------------------------------------- -// reg [31 : 0] tmp_read_data; -// reg tmp_error; //---------------------------------------------------------------- @@ -135,19 +126,14 @@ module avalanche_entropy_core( assign entropy_syn = entropy_syn_reg; assign entropy_data = entropy_reg; - assign led = led_reg; - assign debug_data = entropy_reg[7 : 0]; - assign debug_clk = debug_clk_reg; - assign sampled_noise = noise_sample_reg; assign entropy = entropy_reg[0]; -// assign read_data = tmp_read_data; -// assign error = tmp_error; - assign delta_data = delta_reg; assign delta_clk = delta_clk_reg; + assign debug = debug_reg; + //---------------------------------------------------------------- // reg_update @@ -164,13 +150,14 @@ module avalanche_entropy_core( entropy_reg <= 32'h00000000; entropy_bit_reg <= 1'b0; bit_ctr_reg <= 6'h00; - led_reg <= 8'h00; - led_ctr_reg <= 32'h00000000; debug_ctr_reg <= 4'h0; debug_clk_reg <= 1'b0; cycle_ctr_reg <= 32'h00000000; delta_reg <= 32'h00000000; delta_clk_reg <= 1'b0; + debug_delay_ctr_reg <= 32'h00000000; + debug_reg <= 8'h00; + debug_update_reg <= 0; end else begin @@ -180,16 +167,15 @@ module avalanche_entropy_core( flank0_reg <= noise_sample_reg; flank1_reg <= flank0_reg; - entropy_syn_reg <= entropy_syn_new; + entropy_syn_reg <= entropy_syn_new; entropy_bit_reg <= ~entropy_bit_reg; - led_ctr_reg <= led_ctr_new; - debug_clk_reg <= debug_clk_new; - delta_clk_reg <= delta_clk_new; cycle_ctr_reg <= cycle_ctr_new; + debug_update_reg <= debug_update; + if (delta_we) begin delta_reg <= cycle_ctr_reg; @@ -210,15 +196,46 @@ module avalanche_entropy_core( entropy_reg <= entropy_new; end - if (led_we) + if (debug_delay_ctr_we) begin - led_reg <= entropy_reg[7 : 0]; + debug_delay_ctr_reg <= debug_delay_ctr_new; + end + + if (debug_we) + begin + debug_reg <= ent_shift_reg[7 : 0]; end end end // reg_update //---------------------------------------------------------------- + // debug_out + // + // Logic that updates the debug port. + //---------------------------------------------------------------- + always @* + begin : debug_out + debug_delay_ctr_new = 32'h00000000; + debug_delay_ctr_we = 0; + debug_we = 0; + + if (debug_update_reg) + begin + debug_delay_ctr_new = debug_delay_ctr_reg + 1'b1; + debug_delay_ctr_we = 1; + end + + if (debug_delay_ctr_reg == DEBUG_DELAY) + begin + debug_delay_ctr_new = 32'h00000000; + debug_delay_ctr_we = 1; + debug_we = 1; + end + end + + + //---------------------------------------------------------------- // entropy_collect // // We collect entropy by adding the current state of the @@ -274,7 +291,7 @@ module avalanche_entropy_core( debug_ctr_we = 0; debug_clk_new = 0; - if (debug_ctr_reg == 4'h08) + if (debug_ctr_reg == 4'h8) begin debug_ctr_new = 4'h0; debug_ctr_we = 1; @@ -318,93 +335,6 @@ module avalanche_entropy_core( end end // entropy_ack_logic - - //---------------------------------------------------------------- - // led_update - // - // Sample the entropy register as LED output value at - // the given LED_RATE. - //---------------------------------------------------------------- - always @* - begin : led_update - led_ctr_new = led_ctr_reg + 1'b1; - led_we = 1'b0; - - if (led_ctr_reg == LED_RATE) - begin - led_ctr_new = 32'h00000000; - led_we = 1'b1; - end - end // led_update - - - //---------------------------------------------------------------- - // api_logic - //---------------------------------------------------------------- -// always @* -// begin : api_logic -// tmp_read_data = 32'h00000000; -// tmp_error = 1'b0; -// bit_ctr_rst = 1'b1; -// -// if (cs) -// begin -// if (we) -// begin -// case (address) -// // Write operations. -// -// default: -// begin -// tmp_error = 1; -// end -// endcase // case (address) -// end // if (we) -// -// else -// begin -// case (address) -// // Read operations. -// ADDR_STATUS: -// begin -// tmp_read_data = {31'h00000000, entropy_syn_reg}; -// end -// -// ADDR_ENTROPY: -// begin -// tmp_read_data = entropy_reg; -// bit_ctr_rst = 1'b1; -// end -// -// ADDR_POS_FLANKS: -// begin -// tmp_read_data = posflank_sample_reg; -// end -// -// ADDR_NEG_FLANKS: -// begin -// tmp_read_data = negflank_sample_reg; -// end -// -// ADDR_TOT_FLANKS: -// begin -// tmp_read_data = totflank_sample_reg; -// end -// -// ADDR_DELTA: -// begin -// tmp_read_data = delta_reg; -// end -// -// default: -// begin -// tmp_error = 1; -// end -// endcase // case (address) -// end // else: !if(we) -// end // if (cs) -// end // api_logic - endmodule // avalanche_entropy_core //====================================================================== |