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authorJoachim StroĢˆmbergson <joachim@secworks.se>2015-03-26 13:40:13 +0100
committerJoachim StroĢˆmbergson <joachim@secworks.se>2015-03-26 13:40:13 +0100
commitb117149f26f6798edaad8ff0dbdf284b1ecac063 (patch)
tree725f84231686d2db13084081f45438f57af4b4fb /src
parentaa3ba0f56459a140fcb1df24758ab32a5fe9cc9d (diff)
Cleanup: Merged separate clocked processes. Fixed incorrect bit widths. Changed to localparams. Changed api data read reg to real hold register.
Diffstat (limited to 'src')
-rw-r--r--src/rtl/trng.v141
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
//======================================================================