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-rw-r--r--src/rtl/sha256.v108
1 files changed, 54 insertions, 54 deletions
diff --git a/src/rtl/sha256.v b/src/rtl/sha256.v
index cd33a76..a7d3518 100644
--- a/src/rtl/sha256.v
+++ b/src/rtl/sha256.v
@@ -9,30 +9,30 @@
// Author: Joachim Strombergson
// Copyright (c) 2014, SUNET
// All rights reserved.
-//
-// Redistribution and use in source and binary forms, with or
-// without modification, are permitted provided that the following
-// conditions are met:
-//
-// 1. Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//
-// 2. Redistributions in binary form must reproduce the above copyright
-// notice, this list of conditions and the following disclaimer in
-// the documentation and/or other materials provided with the
-// distribution.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
-// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
-// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
-// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+//
+// Redistribution and use in source and binary forms, with or
+// without modification, are permitted provided that the following
+// conditions are met:
+//
+// 1. Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//
+// 2. Redistributions in binary form must reproduce the above copyright
+// notice, this list of conditions and the following disclaimer in
+// the documentation and/or other materials provided with the
+// distribution.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
-// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
-// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
-// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
-// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
// ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
//======================================================================
@@ -41,11 +41,11 @@ module sha256(
// Clock and reset.
input wire clk,
input wire reset_n,
-
+
// Control.
input wire cs,
input wire we,
-
+
// Data ports.
input wire [7 : 0] address,
input wire [31 : 0] write_data,
@@ -59,7 +59,7 @@ module sha256(
parameter ADDR_NAME0 = 8'h00;
parameter ADDR_NAME1 = 8'h01;
parameter ADDR_VERSION = 8'h02;
-
+
parameter ADDR_CTRL = 8'h08;
parameter CTRL_INIT_BIT = 0;
parameter CTRL_NEXT_BIT = 1;
@@ -67,7 +67,7 @@ module sha256(
parameter ADDR_STATUS = 8'h09;
parameter STATUS_READY_BIT = 0;
parameter STATUS_VALID_BIT = 1;
-
+
parameter ADDR_BLOCK0 = 8'h10;
parameter ADDR_BLOCK1 = 8'h11;
parameter ADDR_BLOCK2 = 8'h12;
@@ -84,7 +84,7 @@ module sha256(
parameter ADDR_BLOCK13 = 8'h1d;
parameter ADDR_BLOCK14 = 8'h1e;
parameter ADDR_BLOCK15 = 8'h1f;
-
+
parameter ADDR_DIGEST0 = 8'h20;
parameter ADDR_DIGEST1 = 8'h21;
parameter ADDR_DIGEST2 = 8'h22;
@@ -98,7 +98,7 @@ module sha256(
parameter CORE_NAME1 = 32'h2d323536; // "-256"
parameter CORE_VERSION = 32'h302e3830; // "0.80"
-
+
//----------------------------------------------------------------
// Registers including update variables and write enable.
//----------------------------------------------------------------
@@ -111,7 +111,7 @@ module sha256(
reg next_new;
reg next_we;
reg next_set;
-
+
reg ready_reg;
reg [31 : 0] block0_reg;
@@ -151,7 +151,7 @@ module sha256(
reg digest_valid_reg;
-
+
//----------------------------------------------------------------
// Wires.
//----------------------------------------------------------------
@@ -164,8 +164,8 @@ module sha256(
reg [31 : 0] tmp_read_data;
reg tmp_error;
-
-
+
+
//----------------------------------------------------------------
// Concurrent connectivity for ports etc.
//----------------------------------------------------------------
@@ -180,35 +180,35 @@ module sha256(
assign read_data = tmp_read_data;
assign error = tmp_error;
-
-
+
+
//----------------------------------------------------------------
// core instantiation.
//----------------------------------------------------------------
sha256_core core(
.clk(clk),
.reset_n(reset_n),
-
+
.init(core_init),
.next(core_next),
-
+
.block(core_block),
-
+
.ready(core_ready),
-
+
.digest(core_digest),
.digest_valid(core_digest_valid)
);
-
-
+
+
//----------------------------------------------------------------
// reg_update
//
// Update functionality for all registers in the core.
- // All registers are positive edge triggered with synchronous
- // active low reset. All registers have write enable.
+ // All registers are positive edge triggered with
+ // asynchronous active low reset.
//----------------------------------------------------------------
- always @ (posedge clk)
+ always @ (posedge clk or negedge reset_n)
begin
if (!reset_n)
begin
@@ -248,7 +248,7 @@ module sha256(
begin
next_reg <= next_new;
end
-
+
if (core_digest_valid)
begin
digest_reg <= core_digest;
@@ -333,7 +333,7 @@ module sha256(
begin
block15_reg <= write_data;
end
-
+
end
end // reg_update
@@ -377,7 +377,7 @@ module sha256(
//----------------------------------------------------------------
// api_logic
//
- // Implementation of the api logic. If cs is enabled will either
+ // Implementation of the api logic. If cs is enabled will either
// try to write to or read from the internal registers.
//----------------------------------------------------------------
always @*
@@ -402,7 +402,7 @@ module sha256(
block15_we = 0;
tmp_read_data = 32'h00000000;
tmp_error = 0;
-
+
if (cs)
begin
if (we)
@@ -414,7 +414,7 @@ module sha256(
init_set = write_data[CTRL_INIT_BIT];
next_set = write_data[CTRL_NEXT_BIT];
end
-
+
ADDR_BLOCK0:
begin
block0_we = 1;
@@ -494,7 +494,7 @@ module sha256(
begin
block15_we = 1;
end
-
+
default:
begin
tmp_error = 1;
@@ -515,7 +515,7 @@ module sha256(
begin
tmp_read_data = CORE_NAME1;
end
-
+
ADDR_VERSION:
begin
tmp_read_data = CORE_VERSION;
@@ -525,12 +525,12 @@ module sha256(
begin
tmp_read_data = {28'h0000000, 2'b00, next_reg, init_reg};
end
-
+
ADDR_STATUS:
begin
tmp_read_data = {28'h0000000, 2'b00, digest_valid_reg, ready_reg};
end
-
+
ADDR_BLOCK0:
begin
tmp_read_data = block0_reg;
@@ -650,7 +650,7 @@ module sha256(
begin
tmp_read_data = digest_reg[31 : 0];
end
-
+
default:
begin
tmp_error = 1;
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-15 21:19:46 +0000