diff options
Diffstat (limited to 'src/rtl')
| -rw-r--r-- | src/rtl/trng.v | 141 |
1 files changed, 68 insertions, 73 deletions
diff --git a/src/rtl/trng.v b/src/rtl/trng.v index 0e0286e..2ef30fb 100644 --- a/src/rtl/trng.v +++ b/src/rtl/trng.v @@ -60,36 +60,36 @@ module trng( //---------------------------------------------------------------- // Internal constant and parameter definitions. //---------------------------------------------------------------- - parameter TRNG_PREFIX = 4'h0; - parameter ENTROPY1_PREFIX = 4'h5; - parameter ENTROPY2_PREFIX = 4'h6; - parameter MIXER_PREFIX = 4'ha; - parameter CSPRNG_PREFIX = 4'hb; - - parameter DEBUG_ENTROPY0 = 3'h0; - parameter DEBUG_ENTROPY1 = 3'h1; - parameter DEBUG_ENTROPY2 = 3'h2; - parameter DEBUG_MIXER = 3'h3; - parameter DEBUG_CSPRNG = 3'h4; - - parameter ADDR_NAME0 = 8'h00; - parameter ADDR_NAME1 = 8'h01; - parameter ADDR_VERSION = 8'h02; - - parameter ADDR_TRNG_CTRL = 8'h10; - parameter TRNG_CTRL_DISCARD_BIT = 0; - parameter TRNG_CTRL_TEST_MODE_BIT = 1; - - parameter ADDR_TRNG_STATUS = 8'h11; - parameter ADDR_DEBUG_CTRL = 8'h12; - parameter ADDR_DEBUG_DELAY = 8'h13; - - parameter TRNG_NAME0 = 32'h74726e67; // "trng" - parameter TRNG_NAME1 = 32'h20202020; // " " - parameter TRNG_VERSION = 32'h302e3031; // "0.01" + localparam TRNG_PREFIX = 4'h0; + localparam ENTROPY1_PREFIX = 4'h5; + localparam ENTROPY2_PREFIX = 4'h6; + localparam MIXER_PREFIX = 4'ha; + localparam CSPRNG_PREFIX = 4'hb; + + localparam DEBUG_ENTROPY0 = 3'h0; + localparam DEBUG_ENTROPY1 = 3'h1; + localparam DEBUG_ENTROPY2 = 3'h2; + localparam DEBUG_MIXER = 3'h3; + localparam DEBUG_CSPRNG = 3'h4; + + localparam ADDR_NAME0 = 8'h00; + localparam ADDR_NAME1 = 8'h01; + localparam ADDR_VERSION = 8'h02; + + localparam ADDR_TRNG_CTRL = 8'h10; + localparam TRNG_CTRL_DISCARD_BIT = 0; + localparam TRNG_CTRL_TEST_MODE_BIT = 1; + + localparam ADDR_TRNG_STATUS = 8'h11; + localparam ADDR_DEBUG_CTRL = 8'h12; + localparam ADDR_DEBUG_DELAY = 8'h13; + + localparam TRNG_NAME0 = 32'h74726e67; // "trng" + localparam TRNG_NAME1 = 32'h20202020; // " " + localparam TRNG_VERSION = 32'h302e3031; // "0.01" // 20x/s @ 50 MHz. - parameter DEFAULT_DEBUG_DELAY = 32'h002625a0; + localparam DEFAULT_DEBUG_DELAY = 32'h002625a0; //---------------------------------------------------------------- @@ -123,8 +123,9 @@ module trng( //---------------------------------------------------------------- wire trng_api_cs = cs && (addr_core_num == TRNG_PREFIX); wire trng_api_we = we; - reg [31 : 0] trng_api_read_data; reg [31 : 0] trng_api_read_data_reg; + reg [31 : 0] trng_api_read_data_new; + reg [31 : 0] trng_api_read_data; reg trng_api_error; wire mixer_more_seed; @@ -200,11 +201,14 @@ module trng( assign entropy0_entropy_data = 32'h00000000; - //---------------------------------------------------------------- - // Address Decoder - //---------------------------------------------------------------- - wire [ 5: 0] addr_core_num = address[11: 8]; // upper 4 bits specify core being addressed - wire [ 7: 0] addr_core_reg = address[7: 0]; // lower 8 bits specify register offset in core + //---------------------------------------------------------------- + // Address Decoder + //---------------------------------------------------------------- + // upper 4 bits specify core being addressed. + wire [3 : 0] addr_core_num = address[11 : 8]; + + // lower 8 bits specify register offset in core. + wire [7 : 0] addr_core_reg = address[7 : 0]; //---------------------------------------------------------------- @@ -387,37 +391,33 @@ module trng( begin if (!reset_n) begin - discard_reg <= 0; - test_mode_reg <= 0; - debug_mux_reg <= DEBUG_CSPRNG; - debug_delay_reg <= DEFAULT_DEBUG_DELAY; - debug_delay_ctr_reg <= 32'h00000000; - debug_out_reg <= 8'h00; + discard_reg <= 0; + test_mode_reg <= 0; + debug_mux_reg <= DEBUG_CSPRNG; + debug_delay_reg <= DEFAULT_DEBUG_DELAY; + debug_delay_ctr_reg <= 32'h00000000; + debug_out_reg <= 8'h00; + trng_api_read_data_reg <= 32'h00000000; end else begin - discard_reg <= discard_new; - debug_delay_ctr_reg <= debug_delay_ctr_new; + discard_reg <= discard_new; + debug_delay_ctr_reg <= debug_delay_ctr_new; + + if (trng_api_cs) + trng_api_read_data_reg <= trng_api_read_data_new; if (debug_out_we) - begin - debug_out_reg <= tmp_debug; - end + debug_out_reg <= tmp_debug; if (test_mode_we) - begin - test_mode_reg <= test_mode_new; - end + test_mode_reg <= test_mode_new; if (debug_mux_we) - begin - debug_mux_reg <= debug_mux_new; - end + debug_mux_reg <= debug_mux_new; if (debug_delay_we) - begin - debug_delay_reg <= debug_delay_new; - end + debug_delay_reg <= debug_delay_new; end end // reg_update @@ -497,15 +497,15 @@ module trng( //---------------------------------------------------------------- always @* begin : trng_api_logic - discard_new = 0; - test_mode_new = 0; - test_mode_we = 0; - debug_mux_new = 3'h0; - debug_mux_we = 0; - debug_delay_new = 32'h00000000; - debug_delay_we = 0; - trng_api_read_data = 32'h00000000; - trng_api_error = 0; + discard_new = 0; + test_mode_new = 0; + test_mode_we = 0; + debug_mux_new = 3'h0; + debug_mux_we = 0; + debug_delay_new = 32'h00000000; + debug_delay_we = 0; + trng_api_read_data_new = 32'h00000000; + trng_api_error = 0; if (trng_api_cs) begin @@ -547,17 +547,17 @@ module trng( // Read operations. ADDR_NAME0: begin - trng_api_read_data = TRNG_NAME0; + trng_api_read_data_new = TRNG_NAME0; end ADDR_NAME1: begin - trng_api_read_data = TRNG_NAME1; + trng_api_read_data_new = TRNG_NAME1; end ADDR_VERSION: begin - trng_api_read_data = TRNG_VERSION; + trng_api_read_data_new = TRNG_VERSION; end ADDR_TRNG_CTRL: @@ -571,12 +571,12 @@ module trng( ADDR_DEBUG_CTRL: begin - trng_api_read_data = debug_mux_new; + trng_api_read_data_new = {29'h0000000, debug_mux_new}; end ADDR_DEBUG_DELAY: begin - trng_api_read_data = debug_delay_reg; + trng_api_read_data_new = debug_delay_reg; end default: @@ -588,11 +588,6 @@ module trng( end end // trng_api_logic - always @(posedge clk) - begin - trng_api_read_data_reg <= trng_api_read_data; - end - endmodule // trng //====================================================================== |