Line Coverage for Module :
flash_phy_scramble
| Line No. | Total | Covered | Percent |
|---|
| TOTAL | | 38 | 38 | 100.00 |
| CONT_ASSIGN | 43 | 1 | 1 | 100.00 |
| CONT_ASSIGN | 43 | 1 | 1 | 100.00 |
| CONT_ASSIGN | 44 | 1 | 1 | 100.00 |
| CONT_ASSIGN | 44 | 1 | 1 | 100.00 |
| CONT_ASSIGN | 46 | 1 | 1 | 100.00 |
| CONT_ASSIGN | 46 | 1 | 1 | 100.00 |
| CONT_ASSIGN | 47 | 1 | 1 | 100.00 |
| CONT_ASSIGN | 47 | 1 | 1 | 100.00 |
| CONT_ASSIGN | 51 | 1 | 1 | 100.00 |
| CONT_ASSIGN | 51 | 1 | 1 | 100.00 |
| CONT_ASSIGN | 52 | 1 | 1 | 100.00 |
| CONT_ASSIGN | 52 | 1 | 1 | 100.00 |
| CONT_ASSIGN | 56 | 1 | 1 | 100.00 |
| CONT_ASSIGN | 56 | 1 | 1 | 100.00 |
| CONT_ASSIGN | 57 | 1 | 1 | 100.00 |
| CONT_ASSIGN | 57 | 1 | 1 | 100.00 |
| CONT_ASSIGN | 58 | 1 | 1 | 100.00 |
| CONT_ASSIGN | 58 | 1 | 1 | 100.00 |
| CONT_ASSIGN | 100 | 1 | 1 | 100.00 |
| CONT_ASSIGN | 102 | 1 | 1 | 100.00 |
| ALWAYS | 118 | 4 | 4 | 100.00 |
| CONT_ASSIGN | 125 | 1 | 1 | 100.00 |
| CONT_ASSIGN | 128 | 1 | 1 | 100.00 |
| CONT_ASSIGN | 166 | 1 | 1 | 100.00 |
| ALWAYS | 173 | 4 | 4 | 100.00 |
| ALWAYS | 189 | 3 | 3 | 100.00 |
| CONT_ASSIGN | 196 | 1 | 1 | 100.00 |
| CONT_ASSIGN | 197 | 1 | 1 | 100.00 |
| CONT_ASSIGN | 232 | 1 | 1 | 100.00 |
| CONT_ASSIGN | 235 | 1 | 1 | 100.00 |
42 // Inputs for GF mult
43 2/2 assign calc_req_banks[k] = scramble_req_i[k].calc_req;
Tests: T1 T2 T3 | T1 T2 T3
44 2/2 assign calc_addr_in_banks[k] = scramble_req_i[k].addr;
Tests: T1 T2 T3 | T1 T2 T3
45 // Outputs for GF mult
46 2/2 assign scramble_rsp_o[k].calc_ack = calc_ack_banks[k];
Tests: T1 T2 T3 | T4 T16 T10
47 2/2 assign scramble_rsp_o[k].mask = calc_mask;
Tests: T1 T2 T3 | T1 T2 T3
48
49
50 // Inputs for scrambling primitive
51 2/2 assign op_req_banks[k] = scramble_req_i[k].op_req;
Tests: T1 T2 T3 | T1 T2 T3
52 2/2 assign op_data_in_banks[k] = {scramble_req_i[k].op_type,
Tests: T1 T2 T3 | T1 T2 T3
53 scramble_req_i[k].plain_data,
54 scramble_req_i[k].scrambled_data};
55 // Outputs for scrambling primitive
56 2/2 assign scramble_rsp_o[k].op_ack = op_ack_banks[k];
Tests: T1 T2 T3 | T1 T2 T3
57 2/2 assign scramble_rsp_o[k].plain_data = plain_data_out;
Tests: T1 T2 T3 | T1 T2 T3
58 2/2 assign scramble_rsp_o[k].scrambled_data = scrambled_data_out;
Tests: T1 T2 T3 | T1 T2 T3
59 end
60
61 // SEC_CM: PHY_ARBITER.CTRL.REDUN
62 logic [NumBanks-1:0] local_err;
63 prim_arbiter_tree_dup #(
64 .N(NumBanks),
65 .DW(BankAddrW),
66 .EnDataPort(1)
67 ) u_prim_arbiter_tree_calc (
68 .clk_i,
69 .rst_ni,
70 .req_chk_i(1'b1),
71 .req_i (calc_req_banks),
72 .data_i (calc_addr_in_banks),
73 .gnt_o (calc_ack_banks),
74 .idx_o (),
75 .valid_o (calc_req),
76 .data_o (calc_addr_in),
77 .ready_i (calc_ack),
78 .err_o (local_err[0])
79 );
80
81 // SEC_CM: PHY_ARBITER.CTRL.REDUN
82 prim_arbiter_tree_dup #(
83 .N(NumBanks),
84 .DW(OpDataWidth),
85 .EnDataPort(1)
86 ) u_prim_arbiter_tree_op (
87 .clk_i,
88 .rst_ni,
89 .req_chk_i(1'b1),
90 .req_i (op_req_banks),
91 .data_i (op_data_in_banks),
92 .gnt_o (op_ack_banks),
93 .idx_o (),
94 .valid_o (op_req),
95 .data_o (op_data_in),
96 .ready_i (op_ack),
97 .err_o (local_err[1])
98 );
99
100 1/1 assign arb_err_o = |local_err;
Tests: T1 T2 T3
101
102 1/1 assign {op_type,
Tests: T1 T2 T3
103 plain_data_in,
104 scrambled_data_in} = op_data_in;
105
106 ///////////////////////////
107 // GF multiplier
108 ///////////////////////////
109
110 localparam int AddrPadWidth = DataWidth - BankAddrW;
111 localparam int UnusedWidth = KeySize - AddrPadWidth;
112
113 // unused portion of addr_key
114 logic [KeySize-1:0] muxed_addr_key;
115
116 logic addr_key_sel;
117 always_ff @(posedge clk_i or negedge rst_ni) begin
118 1/1 if (!rst_ni) begin
Tests: T1 T2 T3
119 1/1 addr_key_sel <= '0;
Tests: T1 T2 T3
120 1/1 end else if (!calc_req || calc_req && calc_ack) begin
Tests: T1 T2 T3
121 1/1 addr_key_sel <= disable_i;
Tests: T1 T2 T3
122 end
MISSING_ELSE
123 end
124
125 1/1 assign muxed_addr_key = addr_key_sel ? rand_addr_key_i : addr_key_i;
Tests: T1 T2 T3
126
127 logic [UnusedWidth-1:0] unused_key;
128 1/1 assign unused_key = muxed_addr_key[KeySize-1 -: UnusedWidth];
Tests: T1 T2 T3
129
130 // Galois Multiply portion
131 // Note: Degree of IPoly and width parameters must match (leading MSB of IPoly is dropped).
132 if (SecScrambleEn) begin : gen_gf_mult
133 prim_gf_mult # (
134 .Width(DataWidth),
135 .StagesPerCycle(DataWidth / GfMultCycles),
136 .IPoly(ScrambleIPoly)
137 ) u_mult (
138 .clk_i,
139 .rst_ni,
140 .req_i(calc_req),
141 .operand_a_i({muxed_addr_key[DataWidth +: AddrPadWidth], calc_addr_in}),
142 .operand_b_i(muxed_addr_key[DataWidth-1:0]),
143 .ack_o(calc_ack),
144 .prod_o(calc_mask)
145 );
146 end else begin : gen_no_gf_mult
147 assign calc_mask = '0;
148
149 always_ff @(posedge clk_i or negedge rst_ni) begin
150 if (!rst_ni) begin
151 calc_ack <= '0;
152 end else if (calc_req && calc_ack) begin
153 calc_ack <= '0;
154 end else if (calc_req && !calc_ack) begin
155 calc_ack <= '1;
156 end
157 end
158 end
159
160 ///////////////////////////
161 // cipher
162 ///////////////////////////
163
164 logic dec;
165 logic [DataWidth-1:0] data;
166 1/1 assign dec = op_type == DeScrambleOp;
Tests: T1 T2 T3
167
168 // Do not allow the key to change during a transaction.
169 // While this may be desirable for security reasons, it creates
170 // timing issues for physical design
171 logic data_key_sel;
172 always_ff @(posedge clk_i or negedge rst_ni) begin
173 1/1 if (!rst_ni) begin
Tests: T1 T2 T3
174 1/1 data_key_sel <= '0;
Tests: T1 T2 T3
175 1/1 end else if (!op_req || op_req && op_ack) begin
Tests: T1 T2 T3
176 1/1 data_key_sel <= disable_i;
Tests: T1 T2 T3
177 end
MISSING_ELSE
178 end
179
180 // the prim_prince valid_o is a flopped version of valid_i
181 // As a result, when op_req stays high due to multiple transactions
182 // in-flight, the receiving logic can misinterpret the 'ack' if we just
183 // tie it to valid_o.
184 // Add a little bit of shimming logic here to properly create the ack
185 logic cipher_valid_in_d, cipher_valid_in_q;
186 logic cipher_valid_out;
187
188 always_ff @(posedge clk_i or negedge rst_ni) begin
189 1/1 if (!rst_ni) begin
Tests: T1 T2 T3
190 1/1 cipher_valid_in_q <= '0;
Tests: T1 T2 T3
191 end else begin
192 1/1 cipher_valid_in_q <= cipher_valid_in_d;
Tests: T1 T2 T3
193 end
194 end
195
196 1/1 assign cipher_valid_in_d = op_ack ? '0 : op_req & !cipher_valid_out;
Tests: T1 T2 T3
197 1/1 assign op_ack = cipher_valid_in_q & cipher_valid_out;
Tests: T1 T2 T3
198
199 if (SecScrambleEn) begin : gen_prince
200 prim_prince # (
201 .DataWidth(DataWidth),
202 .KeyWidth(KeySize),
203 // Use improved key schedule proposed by https://eprint.iacr.org/2014/656.pdf (see appendix).
204 .UseOldKeySched(1'b0),
205 .HalfwayDataReg(1'b1),
206 // No key register is needed half way, since the data_key_i and operation op_type inputs
207 // remain constant until one data block has been processed.
208 .HalfwayKeyReg (1'b0)
209 ) u_cipher (
210 .clk_i,
211 .rst_ni,
212 .valid_i(cipher_valid_in_d),
213 .data_i(dec ? scrambled_data_in : plain_data_in),
214 .key_i(data_key_sel ? rand_data_key_i : data_key_i),
215 .dec_i(dec),
216 .data_o(data),
217 .valid_o(cipher_valid_out)
218 );
219
220 end else begin : gen_no_prince
221 always_ff @(posedge clk_i or negedge rst_ni) begin
222 if (!rst_ni) begin
223 cipher_valid_out <= '0;
224 end else begin
225 cipher_valid_out <= cipher_valid_in_d;
226 end
227 end
228 assign data = dec ? scrambled_data_in : plain_data_in;
229 end
230
231 // if decrypt, output the unscrambled data, feed input through otherwise
232 1/1 assign plain_data_out = dec ? data : scrambled_data_in;
Tests: T1 T2 T3
233
234 // if encrypt, output the scrambled data, feed input through otherwise
235 1/1 assign scrambled_data_out = dec ? plain_data_in : data;
Tests: T1 T2 T3
Cond Coverage for Module :
flash_phy_scramble
| Total | Covered | Percent |
|---|
| Conditions | 29 | 25 | 86.21 |
| Logical | 29 | 25 | 86.21 |
| Non-Logical | 0 | 0 | |
| Event | 0 | 0 | |
LINE 120
EXPRESSION (((!calc_req)) || (calc_req && calc_ack))
------1------ -----------2----------
| -1- | -2- | Status | Tests |
|---|
| 0 | 0 | Covered | T1,T2,T3 |
| 0 | 1 | Unreachable | T1,T2,T3 |
| 1 | 0 | Covered | T1,T2,T3 |
LINE 120
SUB-EXPRESSION (calc_req && calc_ack)
----1--- ----2---
| -1- | -2- | Status | Tests |
|---|
| 0 | 1 | Unreachable | |
| 1 | 0 | Covered | T1,T2,T3 |
| 1 | 1 | Unreachable | T1,T2,T3 |
LINE 125
EXPRESSION (addr_key_sel ? rand_addr_key_i : addr_key_i)
------1-----
| -1- | Status | Tests |
|---|
| 0 | Covered | T1,T2,T3 |
| 1 | Covered | T4,T5,T6 |
LINE 166
EXPRESSION (op_type == DeScrambleOp)
------------1------------
| -1- | Status | Tests |
|---|
| 0 | Covered | T1,T2,T3 |
| 1 | Covered | T1,T2,T3 |
LINE 175
EXPRESSION (((!op_req)) || (op_req && op_ack))
-----1----- ---------2--------
| -1- | -2- | Status | Tests |
|---|
| 0 | 0 | Covered | T1,T2,T3 |
| 0 | 1 | Covered | T1,T2,T3 |
| 1 | 0 | Covered | T1,T2,T3 |
LINE 175
SUB-EXPRESSION (op_req && op_ack)
---1-- ---2--
| -1- | -2- | Status | Tests |
|---|
| 0 | 1 | Not Covered | |
| 1 | 0 | Covered | T1,T2,T3 |
| 1 | 1 | Covered | T1,T2,T3 |
LINE 196
EXPRESSION (op_ack ? '0 : (op_req & ((!cipher_valid_out))))
---1--
| -1- | Status | Tests |
|---|
| 0 | Covered | T1,T2,T3 |
| 1 | Covered | T1,T2,T3 |
LINE 196
SUB-EXPRESSION (op_req & ((!cipher_valid_out)))
---1-- ----------2----------
| -1- | -2- | Status | Tests |
|---|
| 0 | 1 | Covered | T1,T2,T3 |
| 1 | 0 | Not Covered | |
| 1 | 1 | Covered | T1,T2,T3 |
LINE 197
EXPRESSION (cipher_valid_in_q & cipher_valid_out)
--------1-------- --------2-------
| -1- | -2- | Status | Tests |
|---|
| 0 | 1 | Not Covered | |
| 1 | 0 | Not Covered | |
| 1 | 1 | Covered | T1,T2,T3 |
LINE 209
EXPRESSION (dec ? scrambled_data_in : plain_data_in)
-1-
| -1- | Status | Tests |
|---|
| 0 | Covered | T1,T4,T5 |
| 1 | Covered | T1,T2,T3 |
LINE 209
EXPRESSION (data_key_sel ? rand_data_key_i : data_key_i)
------1-----
| -1- | Status | Tests |
|---|
| 0 | Covered | T1,T2,T3 |
| 1 | Covered | T4,T5,T6 |
LINE 232
EXPRESSION (dec ? data : scrambled_data_in)
-1-
| -1- | Status | Tests |
|---|
| 0 | Covered | T1,T4,T5 |
| 1 | Covered | T1,T2,T3 |
LINE 235
EXPRESSION (dec ? plain_data_in : data)
-1-
| -1- | Status | Tests |
|---|
| 0 | Covered | T1,T4,T5 |
| 1 | Covered | T1,T2,T3 |
Branch Coverage for Module :
flash_phy_scramble
| Line No. | Total | Covered | Percent |
| Branches |
|
20 |
20 |
100.00 |
| TERNARY |
125 |
2 |
2 |
100.00 |
| TERNARY |
196 |
2 |
2 |
100.00 |
| TERNARY |
232 |
2 |
2 |
100.00 |
| TERNARY |
235 |
2 |
2 |
100.00 |
| TERNARY |
209 |
2 |
2 |
100.00 |
| TERNARY |
209 |
2 |
2 |
100.00 |
| IF |
118 |
3 |
3 |
100.00 |
| IF |
173 |
3 |
3 |
100.00 |
| IF |
189 |
2 |
2 |
100.00 |
125 assign muxed_addr_key = addr_key_sel ? rand_addr_key_i : addr_key_i;
-1-
==>
==>
Branches:
| -1- | Status | Tests |
| 1 |
Covered |
T4,T5,T6 |
| 0 |
Covered |
T1,T2,T3 |
196 assign cipher_valid_in_d = op_ack ? '0 : op_req & !cipher_valid_out;
-1-
==>
==>
Branches:
| -1- | Status | Tests |
| 1 |
Covered |
T1,T2,T3 |
| 0 |
Covered |
T1,T2,T3 |
232 assign plain_data_out = dec ? data : scrambled_data_in;
-1-
==>
==>
Branches:
| -1- | Status | Tests |
| 1 |
Covered |
T1,T2,T3 |
| 0 |
Covered |
T1,T4,T5 |
235 assign scrambled_data_out = dec ? plain_data_in : data;
-1-
==>
==>
Branches:
| -1- | Status | Tests |
| 1 |
Covered |
T1,T2,T3 |
| 0 |
Covered |
T1,T4,T5 |
209 ) u_cipher (
210 .clk_i,
211 .rst_ni,
212 .valid_i(cipher_valid_in_d),
213 .data_i(dec ? scrambled_data_in : plain_data_in),
-1-
==>
==>
Branches:
| -1- | Status | Tests |
| 1 |
Covered |
T1,T2,T3 |
| 0 |
Covered |
T1,T4,T5 |
209 ) u_cipher (
210 .clk_i,
211 .rst_ni,
212 .valid_i(cipher_valid_in_d),
213 .data_i(dec ? scrambled_data_in : plain_data_in),
-1-
==>
==>
Branches:
| -1- | Status | Tests |
| 1 |
Covered |
T4,T5,T6 |
| 0 |
Covered |
T1,T2,T3 |
118 if (!rst_ni) begin
-1-
119 addr_key_sel <= '0;
==>
120 end else if (!calc_req || calc_req && calc_ack) begin
-2-
121 addr_key_sel <= disable_i;
==>
122 end
MISSING_ELSE
==>
Branches:
| -1- | -2- | Status | Tests |
| 1 |
- |
Covered |
T1,T2,T3 |
| 0 |
1 |
Covered |
T1,T2,T3 |
| 0 |
0 |
Covered |
T1,T2,T3 |
173 if (!rst_ni) begin
-1-
174 data_key_sel <= '0;
==>
175 end else if (!op_req || op_req && op_ack) begin
-2-
176 data_key_sel <= disable_i;
==>
177 end
MISSING_ELSE
==>
Branches:
| -1- | -2- | Status | Tests |
| 1 |
- |
Covered |
T1,T2,T3 |
| 0 |
1 |
Covered |
T1,T2,T3 |
| 0 |
0 |
Covered |
T1,T2,T3 |
189 if (!rst_ni) begin
-1-
190 cipher_valid_in_q <= '0;
==>
191 end else begin
192 cipher_valid_in_q <= cipher_valid_in_d;
==>
Branches:
| -1- | Status | Tests |
| 1 |
Covered |
T1,T2,T3 |
| 0 |
Covered |
T1,T2,T3 |