diff --git a/hdl/verif/tb_sha256_message_build.sv b/hdl/verif/tb_sha256_message_build.sv
index 60dbbc8a28a5c9424b39f6533164e041e02a60bd..7755fceaf9b7d25600391d9e65d72e7997d57cbc 100644
--- a/hdl/verif/tb_sha256_message_build.sv
+++ b/hdl/verif/tb_sha256_message_build.sv
@@ -81,15 +81,27 @@ module tb_sha256_message_build;
data_in <= 512'd0;
data_in_valid <= 1'b0;
data_in_last <= 1'b0;
+ data_in_gap <= 0;
data_in_wait_queue <= 1'b1;
end else if (data_in_drive_en) begin
+ if (data_in_gap > 0) begin
+ data_in_gap <= data_in_gap -1;
+ data_in_valid <= 1'b0;
+ end else begin
+ data_in_valid <= 1'b1;
+ end
if (((data_in_valid == 1'b1) && (data_in_ready == 1'b1)) ||
(data_in_wait_queue == 1'b1)) begin
// Data transfer just completed or transfers already up to date
- if ((data_in_queue.size() > 0) && (data_in_last_queue.size() > 0)) begin
+ if ((data_in_queue.size() > 0) && (data_in_last_queue.size() > 0) && (data_in_gap_queue.size() > 0)) begin
data_in <= data_in_queue.pop_front();
data_in_last <= data_in_last_queue.pop_front();
- data_in_valid <= 1'b1;
+ if (data_in_gap_queue[0] == 0) begin
+ data_in_valid <= 1'b1;
+ end else begin
+ data_in_valid <= 1'b0;
+ end
+ data_in_gap <= data_in_gap_queue.pop_front();
data_in_wait_queue <= 1'b0;
end else begin
// No data currently avaiable in queue to write but transfers up to date
@@ -107,16 +119,28 @@ module tb_sha256_message_build;
cfg_scheme <= 2'd0;
cfg_valid <= 1'b0;
cfg_last <= 1'b0;
+ cfg_gap <= 0;
cfg_wait_queue <= 1'b1;
end else if (cfg_drive_en) begin
+ if (cfg_gap > 0) begin
+ cfg_gap <= cfg_gap -1;
+ cfg_valid <= 1'b0;
+ end else begin
+ cfg_valid <= 1'b1;
+ end
if (((cfg_valid == 1'b1) && (cfg_ready == 1'b1)) ||
(cfg_wait_queue == 1'b1)) begin
// cfg transfer just completed or transfers already up to date
- if ((cfg_size_queue.size() > 0) && (cfg_scheme_queue.size() > 0 ) && (cfg_last_queue.size() > 0)) begin
+ if ((cfg_size_queue.size() > 0) && (cfg_scheme_queue.size() > 0 ) && (cfg_last_queue.size() > 0) && (cfg_gap_queue.size() > 0)) begin
cfg_size <= cfg_size_queue.pop_front();
cfg_scheme <= cfg_scheme_queue.pop_front();
cfg_last <= cfg_last_queue.pop_front();
- cfg_valid <= 1'b1;
+ if (cfg_gap_queue[0] == 0) begin
+ cfg_valid <= 1'b1;
+ end else begin
+ cfg_valid <= 1'b0;
+ end
+ cfg_gap <= cfg_gap_queue.pop_front();
cfg_wait_queue <= 1'b0;
end else begin
// No data currently avaiable in queue to write but transfers up to date
@@ -129,6 +153,8 @@ module tb_sha256_message_build;
logic [511:0] data_out_check;
logic data_out_last_check;
+ int data_in_gap;
+ int cfg_gap;
int data_out_stall;
int packet_num;
@@ -145,9 +171,13 @@ module tb_sha256_message_build;
// Wait for handshake before updating stall value
if ((data_out_valid == 1'b1) && (data_out_ready == 1'b1)) begin
if (data_out_stall_queue.size() > 0) begin
+ if (data_out_stall_queue[0] == 0) begin
+ data_out_ready <= 1'b1;
+ end else begin
+ data_out_ready <= 1'b0;
+ end
data_out_stall <= data_out_stall_queue.pop_front();
end
- data_out_ready <= 1'b0;
// Keep Ready Asserted until handshake seen
end else begin
data_out_ready <= 1'b1;
diff --git a/model/py/hash_model.py b/model/py/hash_model.py
index 5bb0fc49f3e0ed8bb5b0072c0b55aa64eeed8da3..85397c3afb8bf50e915107ba32c6a3fd4e9cd6b2 100644
--- a/model/py/hash_model.py
+++ b/model/py/hash_model.py
@@ -48,8 +48,15 @@ def main():
# Generate Gapping and Stalling Values
# Gapping - Period to wait before taking Input Valid High
# Stalling - Period to wait before taking Output Read High
- cfg_words_gap_list.append(random.randrange(0,gap_limit))
- hash_stall_list.append(random.randrange(0,stall_limit))
+ if gap_limit > 0:
+ cfg_words_gap_list.append(random.randrange(0,gap_limit))
+ else:
+ cfg_words_gap_list.append(0)
+
+ if stall_limit > 0:
+ hash_stall_list.append(random.randrange(0,stall_limit))
+ else:
+ hash_stall_list.append(0)
# Generate expected output in 512 bit chunks
cfg_size = math.ceil(random.randint(0,pow(2,14))/8)*8
@@ -87,13 +94,22 @@ def main():
for i in range(len(in_data_words)):
in_data_words_last.append("0")
- in_data_words_gap.append(random.randrange(0,gap_limit))
+ if gap_limit > 0:
+ in_data_words_gap.append(random.randrange(0,gap_limit))
+ else:
+ in_data_words_gap.append(0)
in_data_words_last[-1] = "1"
for i in range(len(message_block)):
message_block_last.append("0")
- message_block_stall.append(random.randrange(0,stall_limit))
- message_block_gap.append(random.randrange(0,gap_limit))
+ if stall_limit > 0:
+ message_block_stall.append(random.randrange(0,stall_limit))
+ else:
+ message_block_stall.append(0)
+ if gap_limit > 0:
+ message_block_gap.append(random.randrange(0,gap_limit))
+ else:
+ message_block_gap.append(0)
message_block_last[-1] = "1"
cfg_words_list.append(cfg_size_str)