diff options
Diffstat (limited to 'src/rtl/keywrap.v')
| -rw-r--r-- | src/rtl/keywrap.v | 33 |
1 files changed, 29 insertions, 4 deletions
diff --git a/src/rtl/keywrap.v b/src/rtl/keywrap.v index f8fcbd7..023ed14 100644 --- a/src/rtl/keywrap.v +++ b/src/rtl/keywrap.v @@ -73,14 +73,17 @@ module keywrap #(parameter ADDR_BITS = 13) localparam CTRL_INIT_BIT = 0; localparam CTRL_NEXT_BIT = 1; - localparam ADDR_STATUS = 8'h09; - localparam STATUS_READY_BIT = 0; - localparam STATUS_VALID_BIT = 1; + localparam ADDR_STATUS = 8'h09; + localparam STATUS_READY_BIT = 0; + localparam STATUS_VALID_BIT = 1; + localparam STATUS_LOADED_BIT = 2; localparam ADDR_CONFIG = 8'h0a; localparam CTRL_ENCDEC_BIT = 0; localparam CTRL_KEYLEN_BIT = 1; + localparam ADDR_TIMEOUT = 8'h0b; + localparam ADDR_RLEN = 8'h0c; localparam ADDR_A0 = 8'h0e; localparam ADDR_A1 = 8'h0f; @@ -102,6 +105,8 @@ module keywrap #(parameter ADDR_BITS = 13) localparam RLEN_BITS = ADDR_BITS - 2; localparam PAD = ADDR_BITS - 8; + localparam DEFAULT_TIMEOUT = 32'hffff0000; + //---------------------------------------------------------------- // Registers including update variables and write enable. @@ -128,11 +133,15 @@ module keywrap #(parameter ADDR_BITS = 13) reg [31 : 0] key_reg [0 : 7]; reg key_we; + reg [31 : 0] timeout_reg; + reg timeout_we; + reg [31 : 0] api_rd_delay_reg; reg [31 : 0] api_rd_delay_new; reg valid_reg; reg ready_reg; + reg loaded_reg; //---------------------------------------------------------------- @@ -145,6 +154,7 @@ module keywrap #(parameter ADDR_BITS = 13) wire [(MEM_BITS - 1) : 0] core_api_addr; wire core_ready; wire core_valid; + wire core_loaded; wire [255 : 0] core_key; wire [63 : 0] core_a_init; wire [63 : 0] core_a_result; @@ -179,6 +189,9 @@ module keywrap #(parameter ADDR_BITS = 13) .ready(core_ready), .valid(core_valid), + .loaded(core_loaded), + + .timeout(timeout_reg), .rlen(rlen_reg), @@ -214,14 +227,17 @@ module keywrap #(parameter ADDR_BITS = 13) rlen_reg <= {RLEN_BITS{1'h0}}; valid_reg <= 1'h0; ready_reg <= 1'h0; + loaded_reg <= 1'h0; a0_reg <= 32'h0; a1_reg <= 32'h0; api_rd_delay_reg <= 32'h0; + timeout_reg <= DEFAULT_TIMEOUT; end else begin ready_reg <= core_ready; valid_reg <= core_valid; + loaded_reg <= core_loaded; init_reg <= init_new; next_reg <= next_new; api_rd_delay_reg <= api_rd_delay_new; @@ -243,6 +259,9 @@ module keywrap #(parameter ADDR_BITS = 13) if (key_we) key_reg[address[2 : 0]] <= write_data; + + if (timeout_we) + timeout_reg <= write_data; end end // reg_update @@ -285,6 +304,9 @@ module keywrap #(parameter ADDR_BITS = 13) if (address == {{PAD{1'h0}}, ADDR_CONFIG}) config_we = 1'h1; + if (address == {{PAD{1'h0}}, ADDR_TIMEOUT}) + timeout_we = 1'h1; + if (address == {{PAD{1'h0}}, ADDR_RLEN}) rlen_we = 1'h1; @@ -317,7 +339,10 @@ module keywrap #(parameter ADDR_BITS = 13) api_rd_delay_new = {28'h0, keylen_reg, encdec_reg, next_reg, init_reg}; if (address == {{PAD{1'h0}}, ADDR_STATUS}) - api_rd_delay_new = {30'h0, valid_reg, ready_reg}; + api_rd_delay_new = {29'h0, loaded_reg, valid_reg, ready_reg}; + + if (address == {{PAD{1'h0}}, ADDR_TIMEOUT}) + api_rd_delay_new = timeout_reg; if (address == {{PAD{1'h0}}, ADDR_RLEN}) api_rd_delay_new = {19'h0, rlen_reg}; |