//======================================================================
//
// hash_selector.v
// ---------------
// Core selector for hash cores.
//
//
// 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 hash_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
);
/* In this memory segment (HASHES) we have 14 address bits. Every core has
* 8-bit internal address space, so we can have up to 2^(14-8) = 64 cores here.
*
* Core #0 is not an actual HASH core, but a set of board-level (global)
* registers, that can be used to get information about hardware (board
* type, bitstream version and so on).
*
* So far we have three cores: SHA-1, SHA-256 and SHA-512.
*/
/*********************************************************
* To add new HASH core named XXX follow the steps below *
*********************************************************
*
* 1. Add corresponding `define under "List of Available Cores", this will
* allow users to exclude your core from implementation to save some
* slices in case they don't need it.
*
* `define USE_CORE_XXX
*
*
* 2. Choose address of your new core and add corresponding line under
* "Core Address Table". Core addresses can be in the range from 1 to 63
* inclusively. Core address 0 is reserved for a page of global
* registers and must not be used.
*
* localparam CORE_ADDR_XXX = 6'dN;
*
*
* 3. Add instantiation of your new core after all existing cores
* surrounded by conditional synthesis directives.
* You also need a 32-bit output (read data) bus for your core and an
* enable flag. Note that sys_rst in an active-high sync reset signal.
*
* `ifdef USE_CORE_XXX
* wire [31: 0] read_data_xxx;
* wire enable_xxx = sys_ena && (addr_core_num == CORE_ADDR_XXX);
* xxx xxx_inst
* (
* .clk(sys_clk),
* .reset_n(~sys_rst),
* .cs(enable_xxx & (sys_eim_rd | sys_eim_wr)),
* .we(sys_eim_wr),
* .address(addr_core_reg),
* .write_data(sys_write_data),
* .read_data(read_data_xxx),
* .error()
* );
* `endif
*
*
* 4. Add previously created data bus to "Output (Read Data) Multiplexor"
* in the end of this file.
*
* `ifdef USE_CORE_XXX
* CORE_ADDR_XXX:
* sys_read_data_mux = read_data_xxx;
* `endif
*
*/
//----------------------------------------------------------------
// Address Decoder
//----------------------------------------------------------------
wire [ 5: 0] addr_core_num = sys_eim_addr[13: 8]; // upper 6 bits specify core being addressed
wire [ 7: 0] addr_core_reg = sys_eim_addr[ 7: 0]; // lower 8 bits specify register offset in core
/* We can comment following lines to exclude cores from implementation
* in case we run out of slices.
*/
//----------------------------------------------------------------
// List of Available Cores
//----------------------------------------------------------------
// `define USE_CORE_SHA1
// `define USE_CORE_SHA256
// `define USE_CORE_SHA512
//----------------------------------------------------------------
// Core Address Table
//----------------------------------------------------------------
localparam CORE_ADDR_GLOBAL_REGS = 6'd0;
localparam CORE_ADDR_SHA1 = 6'd1;
localparam CORE_ADDR_SHA256 = 6'd2;
localparam CORE_ADDR_SHA512 = 6'd3;
//----------------------------------------------------------------
// Global Registers
//----------------------------------------------------------------
wire [31: 0] read_data_global;
wire enable_global = sys_ena && (addr_core_num == CORE_ADDR_GLOBAL_REGS);
novena_regs novena_regs_inst
(
.clk(sys_clk),
.rst(sys_rst),
.cs(enable_global & (sys_eim_rd | sys_eim_wr)),
.we(sys_eim_wr),
.address(addr_core_reg),
.write_data(sys_write_data),
.read_data(read_data_global)
);
//----------------------------------------------------------------
// SHA-1
//----------------------------------------------------------------
`ifdef USE_CORE_SHA1
wire [31: 0] read_data_sha1;
wire enable_sha1 = sys_ena && (addr_core_num == CORE_ADDR_SHA1);
sha1 sha1_inst
(
.clk(sys_clk),
.reset_n(~sys_rst),
.cs(enable_sha1 & (sys_eim_rd | sys_eim_wr)),
.we(sys_eim_wr),
.address(addr_core_reg),
.write_data(sys_write_data),
.read_data(read_data_sha1)
);
`endif
//----------------------------------------------------------------
// SHA-256
//----------------------------------------------------------------
`ifdef USE_CORE_SHA256
wire [31: 0] read_data_sha256;
wire enable_sha256 = sys_ena && (addr_core_num == CORE_ADDR_SHA256);
sha256 sha256_inst
(
.clk(sys_clk),
.reset_n(~sys_rst),
.cs(enable_sha256 & (sys_eim_rd | sys_eim_wr)),
.we(sys_eim_wr),
.address(addr_core_reg),
.write_data(sys_write_data),
.read_data(read_data_sha256)
);
`endif
//----------------------------------------------------------------
// SHA-512
//----------------------------------------------------------------
`ifdef USE_CORE_SHA512
wire [31: 0] read_data_sha512;
wire enable_sha512 = sys_ena && (addr_core_num == CORE_ADDR_SHA512);
sha512 sha512_inst
(
.clk(sys_clk),
.reset_n(~sys_rst),
.cs(enable_sha512 & (sys_eim_rd | sys_eim_wr)),
.we(sys_eim_wr),
.address(addr_core_reg),
.write_data(sys_write_data),
.read_data(read_data_sha512)
);
`endif
//----------------------------------------------------------------
// Output (Read Data) Multiplexor
//----------------------------------------------------------------
reg [31: 0] sys_read_data_mux;
assign sys_read_data = sys_read_data_mux;
always @*
//
case (addr_core_num)
//
CORE_ADDR_GLOBAL_REGS:
sys_read_data_mux = read_data_global;
`ifdef USE_CORE_SHA1
CORE_ADDR_SHA1:
sys_read_data_mux = read_data_sha1;
`endif
`ifdef USE_CORE_SHA256
CORE_ADDR_SHA256:
sys_read_data_mux = read_data_sha256;
`endif
`ifdef USE_CORE_SHA512
CORE_ADDR_SHA512:
sys_read_data_mux = read_data_sha512;
`endif
//
default:
sys_read_data_mux = {32{1'b0}};
//
endcase
endmodule // hash_selector
//======================================================================
// EOF hash_selector.v
//======================================================================
