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Improve ip_eth_tx_64 module timing performance

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This commit is contained in:
Alex Forencich 2015-05-08 20:37:31 -07:00
parent c9c0bda56f
commit 5ae8eb9611
1 changed files with 11 additions and 14 deletions
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25
rtl/ip_eth_tx_64.v
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@ -132,7 +132,7 @@ reg flush_save;
reg transfer_in_save;
reg [31:0] hdr_sum_temp;
reg [15:0] hdr_sum_reg = 0, hdr_sum_next;
reg [31:0] hdr_sum_reg = 0, hdr_sum_next;
reg [63:0] last_word_data_reg = 0;
reg [7:0] last_word_keep_reg = 0;
@ -281,13 +281,15 @@ always @* begin
if (input_ip_hdr_ready & input_ip_hdr_valid) begin
store_ip_hdr = 1;
hdr_sum_temp = {4'd4, 4'd5, input_ip_dscp, input_ip_ecn} +
hdr_sum_next = {4'd4, 4'd5, input_ip_dscp, input_ip_ecn} +
input_ip_length +
input_ip_identification +
{input_ip_flags, input_ip_fragment_offset} +
{input_ip_ttl, input_ip_protocol};
hdr_sum_temp = hdr_sum_temp[15:0] + hdr_sum_temp[31:16];
hdr_sum_next = hdr_sum_temp[15:0] + hdr_sum_temp[16];
{input_ip_ttl, input_ip_protocol} +
input_ip_source_ip[31:16] +
input_ip_source_ip[15: 0] +
input_ip_dest_ip[31:16] +
input_ip_dest_ip[15: 0];
input_ip_hdr_ready_next = 0;
output_eth_hdr_valid_next = 1;
if (output_eth_payload_tready_int) begin
@ -327,17 +329,12 @@ always @* begin
output_eth_payload_tkeep_int = 8'hff;
end
8'h08: begin
hdr_sum_temp = hdr_sum_reg +
ip_source_ip_reg[31:16] +
ip_source_ip_reg[15: 0] +
ip_dest_ip_reg[31:16] +
ip_dest_ip_reg[15: 0];
hdr_sum_temp = hdr_sum_temp[15:0] + hdr_sum_temp[31:16];
hdr_sum_next = hdr_sum_temp[15:0] + hdr_sum_temp[16];
hdr_sum_temp = hdr_sum_reg[15:0] + hdr_sum_reg[31:16];
hdr_sum_temp = hdr_sum_temp[15:0] + hdr_sum_temp[16];
output_eth_payload_tdata_int[ 7: 0] = ip_ttl_reg;
output_eth_payload_tdata_int[15: 8] = ip_protocol_reg;
output_eth_payload_tdata_int[23:16] = ~hdr_sum_next[15: 8];
output_eth_payload_tdata_int[31:24] = ~hdr_sum_next[ 7: 0];
output_eth_payload_tdata_int[23:16] = ~hdr_sum_temp[15: 8];
output_eth_payload_tdata_int[31:24] = ~hdr_sum_temp[ 7: 0];
output_eth_payload_tdata_int[39:32] = ip_source_ip_reg[31:24];
output_eth_payload_tdata_int[47:40] = ip_source_ip_reg[23:16];
output_eth_payload_tdata_int[55:48] = ip_source_ip_reg[15: 8];