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
|
//======================================================================
//
// novena_top.v
// ------------
// Top module for the Cryptech Novena FPGA framework. This design
// allow us to run the EIM interface at one clock and cores including
// core selector with the always present global clock.
//
//
// Author: Pavel Shatov
// Copyright (c) 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 novena_top
(
// Differential input for 50 MHz general clock.
input wire gclk_p_pin,
input wire gclk_n_pin,
// Reset controlled by the CPU.
// this must be configured as input w/pullup
input wire reset_mcu_b_pin,
// Cryptech avalanche noise board input and LED outputs
input wire ct_noise,
output wire [7 : 0] ct_led,
// EIM interface
input wire eim_bclk, // EIM burst clock. Started by the CPU.
input wire eim_cs0_n, // Chip select (active low).
inout wire [15 : 0] eim_da, // Bidirectional address and data port.
input wire [18: 16] eim_a, // MSB part of address port.
input wire eim_lba_n, // Latch address signal (active low).
input wire eim_wr_n, // write enable signal (active low).
input wire eim_oe_n, // output enable signal (active low).
output wire eim_wait_n, // Data wait signal (active low).
// Novena utility ports
output wire apoptosis_pin, // Hold low to not restart after config.
output wire led_pin // LED on edge close to the FPGA.
);
//----------------------------------------------------------------
// Clock Manager
//
// Clock manager is used to generate SYS_CLK from GCLK
// and implement the reset logic.
// ----------------------------------------------------------------
wire sys_clk;
wire sys_rst;
wire eim_bclk_buf;
novena_clkmgr clkmgr
(
.gclk_p(gclk_p_pin),
.gclk_n(gclk_n_pin),
.reset_mcu_b(reset_mcu_b_pin),
.sys_clk(sys_clk),
.sys_rst(sys_rst)
);
//
// BCLK BUFG
//
BUFG BUFG_BCLK
(
.I(eim_bclk),
.O(eim_bclk_buf)
);
//----------------------------------------------------------------
// EIM Interface
//
// EIM subsystem handles all data transfer to/from CPU via EIM bus.
//----------------------------------------------------------------
wire [16: 0] sys_eim_addr;
wire sys_eim_wr;
wire sys_eim_rd;
wire [31: 0] sys_eim_dout;
wire [31: 0] sys_eim_din;
eim eim
(
.eim_bclk(eim_bclk_buf),
.eim_cs0_n(eim_cs0_n),
.eim_da(eim_da),
.eim_a(eim_a),
.eim_lba_n(eim_lba_n),
.eim_wr_n(eim_wr_n),
.eim_oe_n(eim_oe_n),
.eim_wait_n(eim_wait_n),
.sys_clk(sys_clk),
.sys_rst(sys_rst),
.sys_eim_addr(sys_eim_addr),
.sys_eim_wr(sys_eim_wr),
.sys_eim_rd(sys_eim_rd),
.sys_eim_dout(sys_eim_dout),
.sys_eim_din(sys_eim_din),
.led_pin(led_pin)
);
//----------------------------------------------------------------
// Core Selector
//
// This multiplexer is used to map different types of cores, such as
// hashes, RNGs and ciphers to different regions (segments) of memory.
//----------------------------------------------------------------
// register read data for one clock cycle for EIM
wire [31 : 0] tmp_read_data;
reg [31 : 0] tmp_read_data_reg;
assign sys_eim_din = tmp_read_data_reg;
always @(posedge sys_clk)
begin
tmp_read_data_reg <= tmp_read_data;
end
core_selector cores
(
.sys_clk(sys_clk),
.sys_rst(sys_rst),
.sys_eim_addr(sys_eim_addr),
.sys_eim_wr(sys_eim_wr),
.sys_eim_rd(sys_eim_rd),
.sys_write_data(sys_eim_dout),
.sys_read_data(tmp_read_data),
.noise(ct_noise),
.debug(ct_led)
);
//----------------------------------------------------------------
// Novena Patch
//
// Patch logic to keep the Novena board happy.
// The apoptosis_pin pin must be kept low or the whole board
// (more exactly the CPU) will be reset after the FPGA has
// been configured.
//----------------------------------------------------------------
assign apoptosis_pin = 1'b0;
endmodule
//======================================================================
// EOF novena_top.v
//======================================================================
|
