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Diffstat (limited to 'src/rtl/trng_csprng.v')
-rw-r--r--src/rtl/trng_csprng.v107
1 files changed, 66 insertions, 41 deletions
diff --git a/src/rtl/trng_csprng.v b/src/rtl/trng_csprng.v
index eda9eea..ce5c89c 100644
--- a/src/rtl/trng_csprng.v
+++ b/src/rtl/trng_csprng.v
@@ -76,12 +76,32 @@ module trng_csprng(
localparam ADDR_STATUS = 8'h11;
localparam STATUS_RND_VALID_BIT = 0;
+ localparam ADDR_STAT_BLOCKS_LOW = 8'h14;
+ localparam ADDR_STAT_BLOCKS_HIGH = 8'h15;
+
localparam ADDR_RND_DATA = 8'h20;
localparam ADDR_NUM_ROUNDS = 8'h40;
localparam ADDR_NUM_BLOCKS_LOW = 8'h41;
localparam ADDR_NUM_BLOCKS_HIGH = 8'h42;
+ localparam ADDR_TEST_SEED_W00 = 8'h80;
+ localparam ADDR_TEST_SEED_W01 = 8'h81;
+ localparam ADDR_TEST_SEED_W02 = 8'h82;
+ localparam ADDR_TEST_SEED_W03 = 8'h83;
+ localparam ADDR_TEST_SEED_W04 = 8'h84;
+ localparam ADDR_TEST_SEED_W05 = 8'h85;
+ localparam ADDR_TEST_SEED_W06 = 8'h86;
+ localparam ADDR_TEST_SEED_W07 = 8'h87;
+ localparam ADDR_TEST_SEED_W08 = 8'h88;
+ localparam ADDR_TEST_SEED_W09 = 8'h89;
+ localparam ADDR_TEST_SEED_W10 = 8'h8a;
+ localparam ADDR_TEST_SEED_W11 = 8'h8b;
+ localparam ADDR_TEST_SEED_W12 = 8'h8c;
+ localparam ADDR_TEST_SEED_W13 = 8'h8d;
+ localparam ADDR_TEST_SEED_W14 = 8'h8e;
+ localparam ADDR_TEST_SEED_W15 = 8'h8f;
+
localparam CIPHER_KEYLEN256 = 1'b1; // 256 bit key.
localparam CIPHER_MAX_BLOCKS = 64'h1000000000000000;
@@ -130,6 +150,9 @@ module trng_csprng(
reg block_ctr_we;
reg block_ctr_max;
+ reg [63 : 0] block_stat_ctr_reg;
+ reg [63 : 0] block_stat_ctr_new;
+
reg ready_reg;
reg ready_new;
reg ready_we;
@@ -185,8 +208,6 @@ module trng_csprng(
reg rnd_ack;
reg fifo_cipher_data_valid;
- wire [63 : 0] num_blocks;
-
wire muxed_rnd_ack;
@@ -199,8 +220,6 @@ module trng_csprng(
assign more_seed = more_seed_reg;
assign debug = rnd_data[7 : 0];
assign security_error = 0;
-
- assign num_blocks = {num_blocks_high_reg, num_blocks_low_reg};
assign muxed_rnd_ack = rnd_ack | debug_update;
@@ -259,6 +278,7 @@ module trng_csprng(
cipher_ctr_reg <= {2{32'h00000000}};
cipher_block_reg <= {16{32'h00000000}};
block_ctr_reg <= {2{32'h00000000}};
+ block_stat_ctr_reg <= {2{32'h00000000}};
more_seed_reg <= 0;
seed_ack_reg <= 0;
ready_reg <= 0;
@@ -291,7 +311,10 @@ module trng_csprng(
cipher_block_reg <= cipher_block_new;
if (block_ctr_we)
- block_ctr_reg <= block_ctr_new;
+ begin
+ block_ctr_reg <= block_ctr_new;
+ block_stat_ctr_reg <= block_stat_ctr_new;
+ end
if (ready_we)
ready_reg <= ready_new;
@@ -378,50 +401,40 @@ module trng_csprng(
case (address)
// Read operations.
ADDR_NAME0:
- begin
tmp_read_data = CORE_NAME0;
- end
ADDR_NAME1:
- begin
tmp_read_data = CORE_NAME1;
- end
ADDR_VERSION:
- begin
tmp_read_data = CORE_VERSION;
- end
ADDR_CTRL:
- begin
tmp_read_data = {30'h00000000, seed_reg, enable_reg};
- end
ADDR_STATUS:
- begin
tmp_read_data = {30'h00000000, ready_reg, rnd_syn};
- end
+
+ ADDR_STAT_BLOCKS_LOW:
+ tmp_read_data = block_stat_ctr_reg[31 : 0];
+
+ ADDR_STAT_BLOCKS_HIGH:
+ tmp_read_data = block_stat_ctr_reg[63 : 32];
ADDR_RND_DATA:
begin
tmp_read_data = rnd_data;
- rnd_ack = 1;
+ rnd_ack = 1;
end
ADDR_NUM_ROUNDS:
- begin
tmp_read_data = {27'h0000000, num_rounds_reg};
- end
ADDR_NUM_BLOCKS_LOW:
- begin
tmp_read_data = num_blocks_low_reg;
- end
ADDR_NUM_BLOCKS_HIGH:
- begin
tmp_read_data = num_blocks_high_reg;
- end
default:
begin
@@ -440,28 +453,36 @@ module trng_csprng(
// ability to detect that maximum allowed number of blocks
// has been reached. Either as defined by the application
// or the hard coded CIPHER_MAX_BLOCKS value.
+
+ // The stat counter is a sepatate block counter updated in
+ // sync with the block counter. It is only used to track the
+ // number of blocks generated from the cipher as a metric
+ // provided to the system. The stat counter is never reset.
//----------------------------------------------------------------
always @*
begin : block_ctr
- block_ctr_new = 64'h0000000000000000;
- block_ctr_we = 0;
- block_ctr_max = 0;
+ block_ctr_new = {2{32'h00000000}};
+ block_ctr_we = 1'b0;
+ block_ctr_max = 1'b0;
+ block_stat_ctr_new = {2{32'h00000000}};
if (block_ctr_rst)
begin
- block_ctr_new = 64'h0000000000000000;
- block_ctr_we = 1;
+ block_ctr_new = {2{32'h00000000}};
+ block_ctr_we = 1'b1;
end
if (block_ctr_inc)
begin
- block_ctr_new = block_ctr_reg + 1'b1;
- block_ctr_we = 1;
+ block_ctr_new = block_ctr_reg + 1'b1;
+ block_stat_ctr_new = block_stat_ctr_reg + 1'b1;
+ block_ctr_we = 1;
end
- if ((block_ctr_reg == num_blocks) || (block_ctr_reg == CIPHER_MAX_BLOCKS))
+ if ((block_ctr_reg == {num_blocks_high_reg, num_blocks_low_reg}) ||
+ (block_ctr_reg == CIPHER_MAX_BLOCKS))
begin
- block_ctr_max = 1;
+ block_ctr_max = 1'b1;
end
end // block_ctr
@@ -497,7 +518,7 @@ module trng_csprng(
case (csprng_ctrl_reg)
CTRL_IDLE:
begin
- if (!enable_reg)
+ if (!enable_reg || discard)
begin
csprng_ctrl_new = CTRL_CANCEL;
csprng_ctrl_we = 1;
@@ -512,7 +533,7 @@ module trng_csprng(
CTRL_SEED0:
begin
- if ((!enable_reg) || (seed_reg))
+ if ((!enable_reg) || seed_reg || discard)
begin
csprng_ctrl_new = CTRL_CANCEL;
csprng_ctrl_we = 1;
@@ -529,7 +550,7 @@ module trng_csprng(
CTRL_NSYN:
begin
- if ((!enable_reg) || (seed_reg))
+ if ((!enable_reg) || seed_reg || discard)
begin
csprng_ctrl_new = CTRL_CANCEL;
csprng_ctrl_we = 1;
@@ -544,7 +565,7 @@ module trng_csprng(
CTRL_SEED1:
begin
- if ((!enable_reg) || (seed_reg))
+ if ((!enable_reg) || seed_reg || discard)
begin
csprng_ctrl_new = CTRL_CANCEL;
csprng_ctrl_we = 1;
@@ -569,7 +590,7 @@ module trng_csprng(
CTRL_INIT0:
begin
- if ((!enable_reg) || (seed_reg))
+ if ((!enable_reg) || seed_reg || discard)
begin
csprng_ctrl_new = CTRL_CANCEL;
csprng_ctrl_we = 1;
@@ -585,7 +606,7 @@ module trng_csprng(
CTRL_INIT1:
begin
- if ((!enable_reg) || (seed_reg))
+ if ((!enable_reg) || seed_reg || discard)
begin
csprng_ctrl_new = CTRL_CANCEL;
csprng_ctrl_we = 1;
@@ -599,7 +620,7 @@ module trng_csprng(
CTRL_NEXT0:
begin
- if ((!enable_reg) || (seed_reg))
+ if ((!enable_reg) || seed_reg || discard)
begin
csprng_ctrl_new = CTRL_CANCEL;
csprng_ctrl_we = 1;
@@ -613,12 +634,12 @@ module trng_csprng(
end
CTRL_NEXT1:
- if ((!enable_reg) || (seed_reg))
+ if ((!enable_reg) || seed_reg || discard)
begin
csprng_ctrl_new = CTRL_CANCEL;
csprng_ctrl_we = 1;
end
- else if (cipher_ready)
+ else if (cipher_ready && cipher_data_out_valid)
begin
block_ctr_inc = 1;
fifo_cipher_data_valid = 1;
@@ -628,7 +649,7 @@ module trng_csprng(
CTRL_MORE:
begin
- if ((!enable_reg) || (seed_reg))
+ if ((!enable_reg) || seed_reg || discard)
begin
csprng_ctrl_new = CTRL_CANCEL;
csprng_ctrl_we = 1;
@@ -665,6 +686,10 @@ module trng_csprng(
csprng_ctrl_we = 1;
end
+ default:
+ begin
+ end
+
endcase // case (cspng_ctrl_reg)
end // csprng_ctrl_fsm
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