From 63c5dae7baada6cc8f459f23d5840c56250d8bf7 Mon Sep 17 00:00:00 2001 From: Paul Selkirk Date: Tue, 17 Mar 2015 13:49:25 +0100 Subject: Rearrange cores. --- core_selector/src/rtl/cipher_selector.v | 117 ++++++++++++++++++++++++++++++++ 1 file changed, 117 insertions(+) create mode 100644 core_selector/src/rtl/cipher_selector.v (limited to 'core_selector/src/rtl/cipher_selector.v') diff --git a/core_selector/src/rtl/cipher_selector.v b/core_selector/src/rtl/cipher_selector.v new file mode 100644 index 0000000..c7ae812 --- /dev/null +++ b/core_selector/src/rtl/cipher_selector.v @@ -0,0 +1,117 @@ +//====================================================================== +// +// cipher_selector.v +// ----------------- +// Top level wrapper that creates the Cryptech coretest system. +// The wrapper contains instances of external interface, coretest +// and the core to be tested. And if more than one core is +// present the wrapper also includes address and data muxes. +// +// +// Authors: Joachim Strombergson, Paul Selkirk, Pavel Shatov +// Copyright (c) 2014-2015, 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: +// - 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. +// +// - 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 +// 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. +// +//====================================================================== + +module cipher_selector + ( + input wire sys_clk, + input wire sys_rst, + input wire sys_ena, + + input wire [13: 0] sys_eim_addr, + input wire sys_eim_wr, + input wire sys_eim_rd, + output wire [31 : 0] sys_read_data, + input wire [31 : 0] sys_write_data + ); + + + // + // Output Register + // + reg [31: 0] tmp_read_data; + assign sys_read_data = tmp_read_data; + + + /* So far we have no CIPHER cores, let's make some dummy 32-bit registers here + * to prevent ISE from complaining that we don't use input ports. + */ + + reg [31: 0] reg_dummy_first; + reg [31: 0] reg_dummy_second; + reg [31: 0] reg_dummy_third; + + always @(posedge sys_clk) + // + if (sys_rst) + begin + reg_dummy_first <= {8{4'hD}}; + reg_dummy_second <= {8{4'hE}}; + reg_dummy_third <= {8{4'hF}}; + end + else if (sys_ena) + begin + // + if (sys_eim_wr) + begin + // + // WRITE handler + // + case (sys_eim_addr) + 14'd0: reg_dummy_first <= sys_write_data; + 14'd1: reg_dummy_second <= sys_write_data; + 14'd2: reg_dummy_third <= sys_write_data; + endcase + // + end + // + if (sys_eim_rd) + begin + // + // READ handler + // + case (sys_eim_addr) + 14'd0: tmp_read_data <= reg_dummy_first; + 14'd1: tmp_read_data <= reg_dummy_second; + 14'd2: tmp_read_data <= reg_dummy_third; + // + default: tmp_read_data <= {32{1'b0}}; // read non-existent locations as zeroes + endcase + // + end + // + end + + +endmodule + +//====================================================================== +// EOF cipher_selector.v +//====================================================================== -- cgit v1.2.3