diff options
Diffstat (limited to 'src/rtl')
| -rw-r--r-- | src/rtl/trng_csprng.v | 121 |
1 files changed, 49 insertions, 72 deletions
diff --git a/src/rtl/trng_csprng.v b/src/rtl/trng_csprng.v index 0797208..79f7afa 100644 --- a/src/rtl/trng_csprng.v +++ b/src/rtl/trng_csprng.v @@ -65,35 +65,35 @@ module trng_csprng( //---------------------------------------------------------------- // Internal constant and parameter definitions. //---------------------------------------------------------------- - parameter ADDR_CTRL = 8'h10; - parameter CTRL_ENABLE_BIT = 0; - parameter CTRL_SEED_BIT = 1; + localparam ADDR_CTRL = 8'h10; + localparam CTRL_ENABLE_BIT = 0; + localparam CTRL_SEED_BIT = 1; - parameter ADDR_STATUS = 8'h11; - parameter STATUS_RND_VALID_BIT = 0; + localparam ADDR_STATUS = 8'h11; + localparam STATUS_RND_VALID_BIT = 0; - parameter ADDR_RND_DATA = 8'h20; + localparam ADDR_RND_DATA = 8'h20; - parameter ADDR_NUM_ROUNDS = 8'h40; - parameter ADDR_NUM_BLOCKS_LOW = 8'h41; - parameter ADDR_NUM_BLOCKS_HIGH = 8'h42; + localparam ADDR_NUM_ROUNDS = 8'h40; + localparam ADDR_NUM_BLOCKS_LOW = 8'h41; + localparam ADDR_NUM_BLOCKS_HIGH = 8'h42; - parameter CIPHER_KEYLEN256 = 1'b1; // 256 bit key. - parameter CIPHER_MAX_BLOCKS = 64'h1000000000000000; + localparam CIPHER_KEYLEN256 = 1'b1; // 256 bit key. + localparam CIPHER_MAX_BLOCKS = 64'h1000000000000000; - parameter CTRL_IDLE = 4'h0; - parameter CTRL_SEED0 = 4'h1; - parameter CTRL_NSYN = 4'h2; - parameter CTRL_SEED1 = 4'h3; - parameter CTRL_INIT0 = 4'h4; - parameter CTRL_INIT1 = 4'h5; - parameter CTRL_NEXT0 = 4'h6; - parameter CTRL_NEXT1 = 4'h7; - parameter CTRL_MORE = 4'h8; - parameter CTRL_CANCEL = 4'hf; + localparam CTRL_IDLE = 4'h0; + localparam CTRL_SEED0 = 4'h1; + localparam CTRL_NSYN = 4'h2; + localparam CTRL_SEED1 = 4'h3; + localparam CTRL_INIT0 = 4'h4; + localparam CTRL_INIT1 = 4'h5; + localparam CTRL_NEXT0 = 4'h6; + localparam CTRL_NEXT1 = 4'h7; + localparam CTRL_MORE = 4'h8; + localparam CTRL_CANCE = 4'hf; - parameter DEFAULT_NUM_ROUNDS = 5'h18; - parameter DEFAULT_NUM_BLOCKS = 64'h1000000000000000; + localparam DEFAULT_NUM_ROUNDS = 5'h18; + localparam DEFAULT_NUM_BLOCKS = 64'h1000000000000000; //---------------------------------------------------------------- @@ -155,12 +155,13 @@ module trng_csprng( reg [3 : 0] csprng_ctrl_new; reg csprng_ctrl_we; + reg [31 : 0] read_data_new; + reg [31 : 0] read_data_reg; + //---------------------------------------------------------------- // Wires. //---------------------------------------------------------------- - reg [31 : 0] tmp_read_data; - reg [31 : 0] tmp_read_data_reg; reg tmp_error; reg cipher_init; @@ -185,7 +186,7 @@ module trng_csprng( //---------------------------------------------------------------- // Concurrent connectivity for ports etc. //---------------------------------------------------------------- - assign read_data = tmp_read_data_reg; + assign read_data = read_data_reg; assign error = tmp_error; assign seed_ack = seed_ack_reg; assign more_seed = more_seed_reg; @@ -259,6 +260,7 @@ module trng_csprng( num_rounds_reg <= DEFAULT_NUM_ROUNDS; num_blocks_low_reg <= DEFAULT_NUM_BLOCKS[31 : 0]; num_blocks_high_reg <= DEFAULT_NUM_BLOCKS[63 : 32]; + tmp_read_data_reg <= 32'h00000000; csprng_ctrl_reg <= CTRL_IDLE; end else @@ -267,60 +269,41 @@ module trng_csprng( seed_ack_reg <= seed_ack_new; seed_reg <= seed_new; + if (cs) + read_data_reg <= read_data_new; + if (enable_we) - begin - enable_reg <= enable_new; - end + enable_reg <= enable_new; if (cipher_key_we) - begin - cipher_key_reg <= cipher_key_new; - end + cipher_key_reg <= cipher_key_new; if (cipher_iv_we) - begin - cipher_iv_reg <= cipher_iv_new; - end + cipher_iv_reg <= cipher_iv_new; if (cipher_ctr_we) - begin - cipher_ctr_reg <= cipher_ctr_new; - end + cipher_ctr_reg <= cipher_ctr_new; if (cipher_block_we) - begin - cipher_block_reg <= cipher_block_new; - end + cipher_block_reg <= cipher_block_new; if (block_ctr_we) - begin - block_ctr_reg <= block_ctr_new; - end + block_ctr_reg <= block_ctr_new; if (ready_we) - begin - ready_reg <= ready_new; - end + ready_reg <= ready_new; if (csprng_ctrl_we) - begin - csprng_ctrl_reg <= csprng_ctrl_new; - end + csprng_ctrl_reg <= csprng_ctrl_new; if (num_rounds_we) - begin - num_rounds_reg <= num_rounds_new; - end + num_rounds_reg <= num_rounds_new; if (num_blocks_low_we) - begin - num_blocks_low_reg <= num_blocks_low_new; - end + num_blocks_low_reg <= num_blocks_low_new; if (num_blocks_high_we) - begin - num_blocks_high_reg <= num_blocks_high_new; - end + num_blocks_high_reg <= num_blocks_high_new; end end // reg_update @@ -344,7 +327,7 @@ module trng_csprng( rnd_ack = 0; - tmp_read_data = 32'h00000000; + read_data_new = 32'h00000000; tmp_error = 0; if (cs) @@ -393,33 +376,33 @@ module trng_csprng( // Read operations. ADDR_CTRL: begin - tmp_read_data = {30'h00000000, seed_reg, enable_reg}; + read_data_new = {30'h00000000, seed_reg, enable_reg}; end ADDR_STATUS: begin - tmp_read_data = {30'h00000000, ready_reg, rnd_syn}; + read_data_new = {30'h00000000, ready_reg, rnd_syn}; end ADDR_RND_DATA: begin - tmp_read_data = rnd_data; + read_data_new = rnd_data; rnd_ack = 1; end ADDR_NUM_ROUNDS: begin - tmp_read_data = {27'h0000000, num_rounds_reg}; + read_data_new = {27'h0000000, num_rounds_reg}; end ADDR_NUM_BLOCKS_LOW: begin - tmp_read_data = num_blocks_low_reg; + read_data_new = num_blocks_low_reg; end ADDR_NUM_BLOCKS_HIGH: begin - tmp_read_data = num_blocks_high_reg; + read_data_new = num_blocks_high_reg; end default: @@ -431,12 +414,6 @@ module trng_csprng( end end // cspng_api_logic - // register data for eim output - always @(posedge clk) - begin - tmp_read_data_reg <= tmp_read_data; - end - //---------------------------------------------------------------- // block_ctr |