1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
|
//======================================================================
//
// keywrap_mkmif.v
// ---------------
// Wrapper for the mkmif_core. This allow us to simplify the
// integration of the mkmif in keywrap_core.
//
//
// Author: Joachim Strombergson
// Copyright (c) 2018, 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 keywrap_mkmif (
input wire clk,
input wire reset_n,
output wire mkm_spi_sclk,
output wire mkm_spi_cs_n,
input wire mkm_spi_do,
output wire mkm_spi_di,
input wire init,
input wire read,
input wire write,
input wire key_status,
output wire ready,
input wire [31 : 0] wr_status,
output wire [31 : 0] rd_status,
input wire [255 : 0] wr_key,
output wire [255 : 0] rd_key
);
//----------------------------------------------------------------
// Paramenters and local defines.
//----------------------------------------------------------------
localparam CTRL_IDLE = 4'h0;
localparam CTRL_INIT_WAIT = 4'h1;
localparam CTRL_NEXT_WSTART = 4'h2;
localparam CTRL_NEXT_USTART = 4'h3;
localparam CTRL_NEXT_LOOP0 = 4'h4;
localparam CTRL_NEXT_LOOP = 4'h5;
localparam CTRL_NEXT_WAIT = 4'h6;
localparam CTRL_NEXT_UPDATE = 4'h7;
localparam CTRL_NEXT_WCHECK = 4'h8;
localparam CTRL_NEXT_UCHECK = 4'h9;
localparam CTRL_NEXT_FINALIZE = 4'ha;
// Addresses for storage in the mkm
localparam MKM_STATUS_WORD = 16'h00;
localparam MKM_KEY_BASE_WORD = 16'h04;
localparam DEFAULT_SCLK_DIV = 16'h0020;
//----------------------------------------------------------------
// Registers and memories including control signals.
//----------------------------------------------------------------
reg [31 : 0] key_reg [0 : 7];
reg key_we;
reg [2 : 0] key_word_ctr_reg;
reg [2 : 0] key_word_ctr_new;
reg key_word_ctr_we;
reg key_word_ctr_rst;
reg key_word_ctr_inc;
reg [31 : 0] status_reg;
reg [31 : 0] status_new;
reg status_we;
reg ready_reg;
reg ready_new;
reg ready_we;
reg [3 : 0] keywrap_mkmif_ctrl_reg;
reg [3 : 0] keywrap_mkmif_ctrl_new;
reg keywrap_mkmif_ctrl_we;
//----------------------------------------------------------------
// Wires.
//----------------------------------------------------------------
reg mkm_init_op;
reg mkm_read_op;
reg mkm_write_op;
wire mkm_ready;
wire mkm_valid;
reg [15 : 0] mkm_sclk_div;
reg [15 : 0] mkm_addr;
reg [31 : 0] mkm_write_data;
wire [31 : 0] mkm_read_data;
//----------------------------------------------------------------
// Instantiations.
//----------------------------------------------------------------
mkmif_core mkm(
.clk(clk),
.reset_n(reset_n),
.spi_sclk(mkm_spi_sclk),
.spi_cs_n(mkm_spi_cs_n),
.spi_do(mkm_spi_do),
.spi_di(mkm_spi_di),
.init_op(mkm_init_op),
.read_op(mkm_read_op),
.write_op(mkm_write_op),
.ready(mkm_ready),
.valid(mkm_valid),
.sclk_div(mkm_sclk_div),
.addr(mkm_addr),
.write_data(mkm_write_data),
.read_data(mkm_read_data)
);
//----------------------------------------------------------------
// Assignments for ports.
//----------------------------------------------------------------
//----------------------------------------------------------------
// reg_update
//----------------------------------------------------------------
always @ (posedge clk or negedge reset_n)
begin: reg_update
integer i;
if (!reset_n)
begin
for (i = 0 ; i < 8 ; i = i + 1)
key[i] <= 32'h0;
ready_reg <= 1'h1;
status_reg <= 32'h0;
key_word_ctr_reg <= 3'h0;
keywrap_mkmif_ctrl_reg <= CTRL_IDLE;
end
else
begin
if (ready_we)
ready_reg <= ready_new;
if (key_we)
key_reg[key_word_ctr_reg] <= mkm_read_data;
if (status_we)
status_reg <= mkm_read_data;
if (key_word_ctr_we)
key_word_ctr_reg <= key_word_ctr_new;
if (keywrap_mkmif_ctrl_we)
keywrap_mkmif_ctrl_reg <= keywrap_mkmif_ctrl_new;
end
end // reg_update
//----------------------------------------------------------------
// key_word_ctr
//----------------------------------------------------------------
always @*
begin : key_word_ctr
key_word_ctr_new = 3'h0;
key_word_ctr_we = 1'h0;
if (key_word_ctr_rst)
begin
iteration_ctr_new = 3'h0;
iteration_ctr_we = 1'h1;
end
if (key_word_ctr_inc)
begin
key_word_ctr_new = key_word_ctr_reg + 1'h1;
key_word_ctr_we = 1'h1;
end
end
//----------------------------------------------------------------
// keywrap_mkmif_ctrl
//----------------------------------------------------------------
always @*
begin : keywrap_mkmif_ctrl
ready_new = 1'h0;
ready_we = 1'h0;
key_we = 1'h0;
key_word_ctr_rst = 1'h0;
key_word_ctr_inc = 1'h0;
status_we = 1'h0;
mkm_init_op = 1'h0;
mkm_read_op = 1'h0;
mkm_write_op = 1'h0;
mkm_sclk_div = DEFAULT_SCLK_DIV;
mkm_addr = 16'h0;
mkm_write_data = 32'h0;
keywrap_mkmif_ctrl_new = CTRL_IDLE;
keywrap_mkmif_ctrl_we = 1'h0;
case (keywrap_mkmif_ctrl_reg)
CTRL_IDLE:
begin
if (init)
begin
ready_new = 1'h0;
ready_we = 1'h1;
end
end
default:
begin
end
endcase // case (keywrap_mkmif_ctrl_reg)
end // keywrap_mkmif_ctrl
endmodule // keywrap_mkmif
//======================================================================
// EOF keywrap_mkmif.v
//======================================================================
|
