/* Copyright 2019, The Regents of the University of California. 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 REGENTS OF THE UNIVERSITY OF CALIFORNIA ''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 REGENTS OF THE UNIVERSITY OF CALIFORNIA 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 ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. The views and conclusions contained in the software and documentation are those of the authors and should not be interpreted as representing official policies, either expressed or implied, of The Regents of the University of California. */ // Language: Verilog 2001 `resetall `timescale 1ns / 1ps `default_nettype none /* * Transmit engine */ module tx_engine # ( // Number of ports parameter PORTS = 1, // DMA RAM address width parameter RAM_ADDR_WIDTH = 16, // DMA address width parameter DMA_ADDR_WIDTH = 64, // DMA length field width parameter DMA_LEN_WIDTH = 20, // DMA client length field width parameter DMA_CLIENT_LEN_WIDTH = 20, // Transmit request tag field width parameter REQ_TAG_WIDTH = 8, // Descriptor request tag field width parameter DESC_REQ_TAG_WIDTH = 8, // DMA tag field width parameter DMA_TAG_WIDTH = 8, // DMA client tag field width parameter DMA_CLIENT_TAG_WIDTH = 8, // Queue request tag field width parameter QUEUE_REQ_TAG_WIDTH = 8, // Queue operation tag field width parameter QUEUE_OP_TAG_WIDTH = 8, // Queue index width parameter QUEUE_INDEX_WIDTH = 4, // Queue element pointer width parameter QUEUE_PTR_WIDTH = 16, // Completion queue index width parameter CPL_QUEUE_INDEX_WIDTH = 4, // Descriptor table size (number of in-flight operations) parameter DESC_TABLE_SIZE = 8, // Width of descriptor table field for tracking outstanding DMA operations parameter DESC_TABLE_DMA_OP_COUNT_WIDTH = 4, // Max transmit packet size parameter MAX_TX_SIZE = 2048, // Transmit buffer offset parameter TX_BUFFER_OFFSET = 0, // Transmit buffer size parameter TX_BUFFER_SIZE = 16*MAX_TX_SIZE, // Transmit buffer step size parameter TX_BUFFER_STEP_SIZE = 128, // Descriptor size (in bytes) parameter DESC_SIZE = 16, // Descriptor size (in bytes) parameter CPL_SIZE = 32, // Max number of in-flight descriptor requests parameter MAX_DESC_REQ = 16, // Width of AXI stream descriptor interfaces in bits parameter AXIS_DESC_DATA_WIDTH = DESC_SIZE*8, // AXI stream descriptor tkeep signal width (words per cycle) parameter AXIS_DESC_KEEP_WIDTH = AXIS_DESC_DATA_WIDTH/8, // Enable PTP timestamping parameter PTP_TS_ENABLE = 1, // PTP timestamp width parameter PTP_TS_WIDTH = 96, // Transmit tag width parameter TX_TAG_WIDTH = 16, // Enable TX checksum offload parameter TX_CHECKSUM_ENABLE = 1, // AXI stream tid signal width parameter AXIS_TX_ID_WIDTH = QUEUE_INDEX_WIDTH, // AXI stream tdest signal width parameter AXIS_TX_DEST_WIDTH = $clog2(PORTS)+4, // AXI stream tuser signal width parameter AXIS_TX_USER_WIDTH = TX_TAG_WIDTH + 1 ) ( input wire clk, input wire rst, /* * Transmit request input (queue index) */ input wire [QUEUE_INDEX_WIDTH-1:0] s_axis_tx_req_queue, input wire [REQ_TAG_WIDTH-1:0] s_axis_tx_req_tag, input wire [AXIS_TX_DEST_WIDTH-1:0] s_axis_tx_req_dest, input wire s_axis_tx_req_valid, output wire s_axis_tx_req_ready, /* * Transmit request status output */ output wire [DMA_CLIENT_LEN_WIDTH-1:0] m_axis_tx_req_status_len, output wire [REQ_TAG_WIDTH-1:0] m_axis_tx_req_status_tag, output wire m_axis_tx_req_status_valid, /* * Descriptor request output */ output wire [QUEUE_INDEX_WIDTH-1:0] m_axis_desc_req_queue, output wire [DESC_REQ_TAG_WIDTH-1:0] m_axis_desc_req_tag, output wire m_axis_desc_req_valid, input wire m_axis_desc_req_ready, /* * Descriptor request status input */ input wire [QUEUE_INDEX_WIDTH-1:0] s_axis_desc_req_status_queue, input wire [QUEUE_PTR_WIDTH-1:0] s_axis_desc_req_status_ptr, input wire [CPL_QUEUE_INDEX_WIDTH-1:0] s_axis_desc_req_status_cpl, input wire [DESC_REQ_TAG_WIDTH-1:0] s_axis_desc_req_status_tag, input wire s_axis_desc_req_status_empty, input wire s_axis_desc_req_status_error, input wire s_axis_desc_req_status_valid, /* * Descriptor data input */ input wire [AXIS_DESC_DATA_WIDTH-1:0] s_axis_desc_tdata, input wire [AXIS_DESC_KEEP_WIDTH-1:0] s_axis_desc_tkeep, input wire s_axis_desc_tvalid, output wire s_axis_desc_tready, input wire s_axis_desc_tlast, input wire [DESC_REQ_TAG_WIDTH-1:0] s_axis_desc_tid, input wire s_axis_desc_tuser, /* * Completion request output */ output wire [QUEUE_INDEX_WIDTH-1:0] m_axis_cpl_req_queue, output wire [DESC_REQ_TAG_WIDTH-1:0] m_axis_cpl_req_tag, output wire [CPL_SIZE*8-1:0] m_axis_cpl_req_data, output wire m_axis_cpl_req_valid, input wire m_axis_cpl_req_ready, /* * Completion request status input */ input wire [DESC_REQ_TAG_WIDTH-1:0] s_axis_cpl_req_status_tag, input wire s_axis_cpl_req_status_full, input wire s_axis_cpl_req_status_error, input wire s_axis_cpl_req_status_valid, /* * DMA read descriptor output */ output wire [DMA_ADDR_WIDTH-1:0] m_axis_dma_read_desc_dma_addr, output wire [RAM_ADDR_WIDTH-1:0] m_axis_dma_read_desc_ram_addr, output wire [DMA_LEN_WIDTH-1:0] m_axis_dma_read_desc_len, output wire [DMA_TAG_WIDTH-1:0] m_axis_dma_read_desc_tag, output wire m_axis_dma_read_desc_valid, input wire m_axis_dma_read_desc_ready, /* * DMA read descriptor status input */ input wire [DMA_TAG_WIDTH-1:0] s_axis_dma_read_desc_status_tag, input wire [3:0] s_axis_dma_read_desc_status_error, input wire s_axis_dma_read_desc_status_valid, /* * Transmit descriptor output */ output wire [RAM_ADDR_WIDTH-1:0] m_axis_tx_desc_addr, output wire [DMA_CLIENT_LEN_WIDTH-1:0] m_axis_tx_desc_len, output wire [DMA_CLIENT_TAG_WIDTH-1:0] m_axis_tx_desc_tag, output wire [AXIS_TX_ID_WIDTH-1:0] m_axis_tx_desc_id, output wire [AXIS_TX_DEST_WIDTH-1:0] m_axis_tx_desc_dest, output wire [AXIS_TX_USER_WIDTH-1:0] m_axis_tx_desc_user, output wire m_axis_tx_desc_valid, input wire m_axis_tx_desc_ready, /* * Transmit descriptor status input */ input wire [DMA_CLIENT_TAG_WIDTH-1:0] s_axis_tx_desc_status_tag, input wire [3:0] s_axis_tx_desc_status_error, input wire s_axis_tx_desc_status_valid, /* * Transmit checksum command output */ output wire m_axis_tx_csum_cmd_csum_enable, output wire [7:0] m_axis_tx_csum_cmd_csum_start, output wire [7:0] m_axis_tx_csum_cmd_csum_offset, output wire m_axis_tx_csum_cmd_valid, input wire m_axis_tx_csum_cmd_ready, /* * Transmit completion input */ input wire [TX_TAG_WIDTH-1:0] s_axis_tx_cpl_tag, input wire [PTP_TS_WIDTH-1:0] s_axis_tx_cpl_ts, input wire s_axis_tx_cpl_valid, output wire s_axis_tx_cpl_ready, /* * Configuration */ input wire enable ); parameter CL_DESC_TABLE_SIZE = $clog2(DESC_TABLE_SIZE); parameter DESC_PTR_MASK = {CL_DESC_TABLE_SIZE{1'b1}}; parameter CL_MAX_TX_SIZE = $clog2(MAX_TX_SIZE); parameter CL_TX_BUFFER_SIZE = $clog2(TX_BUFFER_SIZE); parameter TX_BUFFER_PTR_MASK = {CL_TX_BUFFER_SIZE{1'b1}}; parameter TX_BUFFER_PTR_MASK_LOWER = {$clog2(TX_BUFFER_STEP_SIZE){1'b1}}; parameter TX_BUFFER_PTR_MASK_UPPER = TX_BUFFER_PTR_MASK & ~TX_BUFFER_PTR_MASK_LOWER; parameter CL_MAX_DESC_REQ = $clog2(MAX_DESC_REQ); // bus width assertions initial begin if (DMA_TAG_WIDTH < CL_DESC_TABLE_SIZE) begin $error("Error: DMA tag width insufficient for descriptor table size (instance %m)"); $finish; end if (DMA_CLIENT_TAG_WIDTH < CL_DESC_TABLE_SIZE) begin $error("Error: DMA client tag width insufficient for descriptor table size (instance %m)"); $finish; end if (QUEUE_REQ_TAG_WIDTH < CL_DESC_TABLE_SIZE) begin $error("Error: QUEUE_REQ_TAG_WIDTH must be at least $clog2(DESC_TABLE_SIZE) (instance %m)"); $finish; end if (DESC_REQ_TAG_WIDTH < CL_DESC_TABLE_SIZE) begin $error("Error: DESC_REQ_TAG_WIDTH must be at least $clog2(DESC_TABLE_SIZE) (instance %m)"); $finish; end if (QUEUE_REQ_TAG_WIDTH < REQ_TAG_WIDTH) begin $error("Error: QUEUE_REQ_TAG_WIDTH must be at least REQ_TAG_WIDTH (instance %m)"); $finish; end if (RAM_ADDR_WIDTH < CL_TX_BUFFER_SIZE) begin $error("Error: RAM_ADDR_WIDTH insufficient for buffer size (instance %m)"); $finish; end if (TX_TAG_WIDTH < CL_DESC_TABLE_SIZE+1) begin $error("Error: TX_TAG_WIDTH insufficient for requested descriptor table size (instance %m)"); $finish; end end reg s_axis_tx_req_ready_reg = 1'b0, s_axis_tx_req_ready_next; reg [DMA_CLIENT_LEN_WIDTH-1:0] m_axis_tx_req_status_len_reg = {DMA_CLIENT_LEN_WIDTH{1'b0}}, m_axis_tx_req_status_len_next; reg [REQ_TAG_WIDTH-1:0] m_axis_tx_req_status_tag_reg = {REQ_TAG_WIDTH{1'b0}}, m_axis_tx_req_status_tag_next; reg m_axis_tx_req_status_valid_reg = 1'b0, m_axis_tx_req_status_valid_next; reg [QUEUE_INDEX_WIDTH-1:0] m_axis_desc_req_queue_reg = {QUEUE_INDEX_WIDTH{1'b0}}, m_axis_desc_req_queue_next; reg [DESC_REQ_TAG_WIDTH-1:0] m_axis_desc_req_tag_reg = {DESC_REQ_TAG_WIDTH{1'b0}}, m_axis_desc_req_tag_next; reg m_axis_desc_req_valid_reg = 1'b0, m_axis_desc_req_valid_next; reg s_axis_desc_tready_reg = 1'b0, s_axis_desc_tready_next; reg [CPL_QUEUE_INDEX_WIDTH-1:0] m_axis_cpl_req_queue_reg = {CPL_QUEUE_INDEX_WIDTH{1'b0}}, m_axis_cpl_req_queue_next; reg [DESC_REQ_TAG_WIDTH-1:0] m_axis_cpl_req_tag_reg = {DESC_REQ_TAG_WIDTH{1'b0}}, m_axis_cpl_req_tag_next; reg [CPL_SIZE*8-1:0] m_axis_cpl_req_data_reg = {CPL_SIZE*8{1'b0}}, m_axis_cpl_req_data_next; reg m_axis_cpl_req_valid_reg = 1'b0, m_axis_cpl_req_valid_next; reg [DMA_ADDR_WIDTH-1:0] m_axis_dma_read_desc_dma_addr_reg = {DMA_ADDR_WIDTH{1'b0}}, m_axis_dma_read_desc_dma_addr_next; reg [RAM_ADDR_WIDTH-1:0] m_axis_dma_read_desc_ram_addr_reg = {RAM_ADDR_WIDTH{1'b0}}, m_axis_dma_read_desc_ram_addr_next; reg [DMA_LEN_WIDTH-1:0] m_axis_dma_read_desc_len_reg = {DMA_LEN_WIDTH{1'b0}}, m_axis_dma_read_desc_len_next; reg [DMA_TAG_WIDTH-1:0] m_axis_dma_read_desc_tag_reg = {DMA_TAG_WIDTH{1'b0}}, m_axis_dma_read_desc_tag_next; reg m_axis_dma_read_desc_valid_reg = 1'b0, m_axis_dma_read_desc_valid_next; reg [RAM_ADDR_WIDTH-1:0] m_axis_tx_desc_addr_reg = {RAM_ADDR_WIDTH{1'b0}}, m_axis_tx_desc_addr_next; reg [DMA_CLIENT_LEN_WIDTH-1:0] m_axis_tx_desc_len_reg = {DMA_CLIENT_LEN_WIDTH{1'b0}}, m_axis_tx_desc_len_next; reg [DMA_CLIENT_TAG_WIDTH-1:0] m_axis_tx_desc_tag_reg = {DMA_CLIENT_TAG_WIDTH{1'b0}}, m_axis_tx_desc_tag_next; reg [AXIS_TX_ID_WIDTH-1:0] m_axis_tx_desc_id_reg = 0, m_axis_tx_desc_id_next; reg [AXIS_TX_DEST_WIDTH-1:0] m_axis_tx_desc_dest_reg = 0, m_axis_tx_desc_dest_next; reg [AXIS_TX_USER_WIDTH-1:0] m_axis_tx_desc_user_reg = 0, m_axis_tx_desc_user_next; reg m_axis_tx_desc_valid_reg = 1'b0, m_axis_tx_desc_valid_next; reg m_axis_tx_csum_cmd_csum_enable_reg = 1'b0, m_axis_tx_csum_cmd_csum_enable_next; reg [7:0] m_axis_tx_csum_cmd_csum_start_reg = 7'd0, m_axis_tx_csum_cmd_csum_start_next; reg [7:0] m_axis_tx_csum_cmd_csum_offset_reg = 7'd0, m_axis_tx_csum_cmd_csum_offset_next; reg m_axis_tx_csum_cmd_valid_reg = 1'b0, m_axis_tx_csum_cmd_valid_next; reg s_axis_tx_cpl_ready_reg = 1'b0, s_axis_tx_cpl_ready_next; reg [CL_TX_BUFFER_SIZE+1-1:0] buf_wr_ptr_reg = 0, buf_wr_ptr_next; reg [CL_TX_BUFFER_SIZE+1-1:0] buf_rd_ptr_reg = 0, buf_rd_ptr_next; reg desc_start_reg = 1'b1, desc_start_next; reg [DMA_CLIENT_LEN_WIDTH-1:0] desc_len_reg = {DMA_CLIENT_LEN_WIDTH{1'b0}}, desc_len_next; reg [DMA_CLIENT_LEN_WIDTH-1:0] early_tx_req_status_len_reg = {DMA_CLIENT_LEN_WIDTH{1'b0}}, early_tx_req_status_len_next; reg [REQ_TAG_WIDTH-1:0] early_tx_req_status_tag_reg = {REQ_TAG_WIDTH{1'b0}}, early_tx_req_status_tag_next; reg early_tx_req_status_valid_reg = 1'b0, early_tx_req_status_valid_next; reg [DMA_CLIENT_LEN_WIDTH-1:0] finish_tx_req_status_len_reg = {DMA_CLIENT_LEN_WIDTH{1'b0}}, finish_tx_req_status_len_next; reg [REQ_TAG_WIDTH-1:0] finish_tx_req_status_tag_reg = {REQ_TAG_WIDTH{1'b0}}, finish_tx_req_status_tag_next; reg finish_tx_req_status_valid_reg = 1'b0, finish_tx_req_status_valid_next; reg [CL_MAX_DESC_REQ+1-1:0] active_desc_req_count_reg = 0; reg inc_active_desc_req; reg dec_active_desc_req_1; reg dec_active_desc_req_2; reg [DESC_TABLE_SIZE-1:0] desc_table_active = 0; reg [DESC_TABLE_SIZE-1:0] desc_table_invalid = 0; reg [DESC_TABLE_SIZE-1:0] desc_table_desc_fetched = 0; reg [DESC_TABLE_SIZE-1:0] desc_table_data_fetched = 0; (* ram_style = "distributed", ramstyle = "no_rw_check, mlab" *) reg desc_table_tx_done_a[DESC_TABLE_SIZE-1:0]; (* ram_style = "distributed", ramstyle = "no_rw_check, mlab" *) reg desc_table_tx_done_b[DESC_TABLE_SIZE-1:0]; reg [DESC_TABLE_SIZE-1:0] desc_table_cpl_write_done = 0; (* ram_style = "distributed", ramstyle = "no_rw_check, mlab" *) reg [REQ_TAG_WIDTH-1:0] desc_table_tag[DESC_TABLE_SIZE-1:0]; (* ram_style = "distributed", ramstyle = "no_rw_check, mlab" *) reg [QUEUE_INDEX_WIDTH-1:0] desc_table_queue[DESC_TABLE_SIZE-1:0]; (* ram_style = "distributed", ramstyle = "no_rw_check, mlab" *) reg [QUEUE_PTR_WIDTH-1:0] desc_table_queue_ptr[DESC_TABLE_SIZE-1:0]; (* ram_style = "distributed", ramstyle = "no_rw_check, mlab" *) reg [CPL_QUEUE_INDEX_WIDTH-1:0] desc_table_cpl_queue[DESC_TABLE_SIZE-1:0]; (* ram_style = "distributed", ramstyle = "no_rw_check, mlab" *) reg [AXIS_TX_DEST_WIDTH-1:0] desc_table_dest[DESC_TABLE_SIZE-1:0]; (* ram_style = "distributed", ramstyle = "no_rw_check, mlab" *) reg [6:0] desc_table_csum_start[DESC_TABLE_SIZE-1:0]; (* ram_style = "distributed", ramstyle = "no_rw_check, mlab" *) reg [7:0] desc_table_csum_offset[DESC_TABLE_SIZE-1:0]; (* ram_style = "distributed", ramstyle = "no_rw_check, mlab" *) reg desc_table_csum_enable[DESC_TABLE_SIZE-1:0]; (* ram_style = "distributed", ramstyle = "no_rw_check, mlab" *) reg [DMA_CLIENT_LEN_WIDTH-1:0] desc_table_len[DESC_TABLE_SIZE-1:0]; (* ram_style = "distributed", ramstyle = "no_rw_check, mlab" *) reg [CL_TX_BUFFER_SIZE+1-1:0] desc_table_buf_ptr[DESC_TABLE_SIZE-1:0]; (* ram_style = "distributed", ramstyle = "no_rw_check, mlab" *) reg [PTP_TS_WIDTH-1:0] desc_table_ptp_ts[DESC_TABLE_SIZE-1:0]; (* ram_style = "distributed", ramstyle = "no_rw_check, mlab" *) reg desc_table_read_commit[DESC_TABLE_SIZE-1:0]; (* ram_style = "distributed", ramstyle = "no_rw_check, mlab" *) reg [DESC_TABLE_DMA_OP_COUNT_WIDTH-1:0] desc_table_read_count_start[DESC_TABLE_SIZE-1:0]; (* ram_style = "distributed", ramstyle = "no_rw_check, mlab" *) reg [DESC_TABLE_DMA_OP_COUNT_WIDTH-1:0] desc_table_read_count_finish[DESC_TABLE_SIZE-1:0]; reg [CL_DESC_TABLE_SIZE+1-1:0] desc_table_start_ptr_reg = 0; reg [QUEUE_INDEX_WIDTH-1:0] desc_table_start_queue; reg [REQ_TAG_WIDTH-1:0] desc_table_start_tag; reg [AXIS_TX_DEST_WIDTH-1:0] desc_table_start_dest; reg desc_table_start_en; reg [CL_DESC_TABLE_SIZE-1:0] desc_table_dequeue_ptr; reg [QUEUE_PTR_WIDTH-1:0] desc_table_dequeue_queue_ptr; reg [CPL_QUEUE_INDEX_WIDTH-1:0] desc_table_dequeue_cpl_queue; reg desc_table_dequeue_invalid; reg desc_table_dequeue_en; reg [CL_DESC_TABLE_SIZE-1:0] desc_table_desc_ctrl_ptr; reg [CL_TX_BUFFER_SIZE+1-1:0] desc_table_desc_ctrl_buf_ptr; reg [6:0] desc_table_desc_ctrl_csum_start; reg [7:0] desc_table_desc_ctrl_csum_offset; reg desc_table_desc_ctrl_csum_enable; reg desc_table_desc_ctrl_en; reg [CL_DESC_TABLE_SIZE-1:0] desc_table_desc_fetched_ptr; reg [DMA_CLIENT_LEN_WIDTH-1:0] desc_table_desc_fetched_len; reg desc_table_desc_fetched_en; reg [CL_DESC_TABLE_SIZE-1:0] desc_table_data_fetched_ptr; reg desc_table_data_fetched_en; reg [CL_DESC_TABLE_SIZE+1-1:0] desc_table_tx_start_ptr_reg = 0; reg desc_table_tx_start_en; reg [CL_DESC_TABLE_SIZE-1:0] desc_table_tx_dma_finish_ptr; reg desc_table_tx_dma_finish_en; reg [CL_DESC_TABLE_SIZE-1:0] desc_table_tx_finish_ptr; reg [PTP_TS_WIDTH-1:0] desc_table_tx_finish_ts; reg desc_table_tx_finish_en; reg [CL_DESC_TABLE_SIZE+1-1:0] desc_table_cpl_enqueue_start_ptr_reg = 0; reg desc_table_cpl_enqueue_start_en; reg [CL_DESC_TABLE_SIZE-1:0] desc_table_cpl_write_done_ptr; reg desc_table_cpl_write_done_en; reg [CL_DESC_TABLE_SIZE+1-1:0] desc_table_finish_ptr_reg = 0; reg desc_table_finish_en; reg [CL_DESC_TABLE_SIZE+1-1:0] desc_table_read_start_ptr; reg desc_table_read_start_commit; reg desc_table_read_start_init; reg desc_table_read_start_en; reg [CL_DESC_TABLE_SIZE+1-1:0] desc_table_read_finish_ptr; reg desc_table_read_finish_en; assign s_axis_tx_req_ready = s_axis_tx_req_ready_reg; assign m_axis_tx_req_status_len = m_axis_tx_req_status_len_reg; assign m_axis_tx_req_status_tag = m_axis_tx_req_status_tag_reg; assign m_axis_tx_req_status_valid = m_axis_tx_req_status_valid_reg; assign m_axis_desc_req_queue = m_axis_desc_req_queue_reg; assign m_axis_desc_req_tag = m_axis_desc_req_tag_reg; assign m_axis_desc_req_valid = m_axis_desc_req_valid_reg; assign s_axis_desc_tready = s_axis_desc_tready_reg; assign m_axis_cpl_req_queue = m_axis_cpl_req_queue_reg; assign m_axis_cpl_req_tag = m_axis_cpl_req_tag_reg; assign m_axis_cpl_req_data = m_axis_cpl_req_data_reg; assign m_axis_cpl_req_valid = m_axis_cpl_req_valid_reg; assign m_axis_dma_read_desc_dma_addr = m_axis_dma_read_desc_dma_addr_reg; assign m_axis_dma_read_desc_ram_addr = m_axis_dma_read_desc_ram_addr_reg; assign m_axis_dma_read_desc_len = m_axis_dma_read_desc_len_reg; assign m_axis_dma_read_desc_tag = m_axis_dma_read_desc_tag_reg; assign m_axis_dma_read_desc_valid = m_axis_dma_read_desc_valid_reg; assign m_axis_tx_desc_addr = m_axis_tx_desc_addr_reg; assign m_axis_tx_desc_len = m_axis_tx_desc_len_reg; assign m_axis_tx_desc_tag = m_axis_tx_desc_tag_reg; assign m_axis_tx_desc_id = m_axis_tx_desc_id_reg; assign m_axis_tx_desc_dest = m_axis_tx_desc_dest_reg; assign m_axis_tx_desc_user = m_axis_tx_desc_user_reg; assign m_axis_tx_desc_valid = m_axis_tx_desc_valid_reg; assign m_axis_tx_csum_cmd_csum_enable = m_axis_tx_csum_cmd_csum_enable_reg; assign m_axis_tx_csum_cmd_csum_start = m_axis_tx_csum_cmd_csum_start_reg; assign m_axis_tx_csum_cmd_csum_offset = m_axis_tx_csum_cmd_csum_offset_reg; assign m_axis_tx_csum_cmd_valid = m_axis_tx_csum_cmd_valid_reg; assign s_axis_tx_cpl_ready = s_axis_tx_cpl_ready_reg; // reg [15:0] stall_cnt = 0; // wire stalled = stall_cnt[12]; // // assign dbg = stalled; // always @(posedge clk) begin // if (rst) begin // stall_cnt <= 0; // end else begin // if (s_axis_tx_req_ready) begin // stall_cnt <= 0; // end else begin // stall_cnt <= stall_cnt + 1; // end // end // end // ila_0 ila_inst ( // .clk(clk), // .trig_out(), // .trig_out_ack(1'b0), // .trig_in(1'b0), // .trig_in_ack(), // .probe0({desc_table_active, desc_table_invalid, desc_table_desc_fetched, desc_table_data_fetched, desc_table_tx_done, desc_table_cpl_write_done, pkt_table_active, // m_axis_dma_read_desc_len, m_axis_dma_read_desc_tag, m_axis_dma_read_desc_valid, m_axis_dma_read_desc_ready, // s_axis_dma_read_desc_status_tag, s_axis_dma_read_desc_status_valid, // m_axis_dma_write_desc_len, m_axis_dma_write_desc_tag, m_axis_dma_write_desc_valid, m_axis_dma_write_desc_ready, // s_axis_dma_write_desc_status_tag, s_axis_dma_write_desc_status_valid}), // .probe1(0), // .probe2(0), // .probe3(s_axis_tx_req_ready), // .probe4({desc_table_start_ptr_reg, desc_table_desc_read_start_ptr_reg, desc_table_data_fetch_start_ptr_reg, desc_table_tx_start_ptr_reg, desc_table_cpl_enqueue_start_ptr_reg, desc_table_finish_ptr_reg, stall_cnt}), // .probe5(0) // ); integer i; initial begin for (i = 0; i < DESC_TABLE_SIZE; i = i + 1) begin desc_table_tx_done_a[i] = 0; desc_table_tx_done_b[i] = 0; desc_table_tag[i] = 0; desc_table_queue[i] = 0; desc_table_queue_ptr[i] = 0; desc_table_cpl_queue[i] = 0; desc_table_dest[i] = 0; desc_table_csum_start[i] = 0; desc_table_csum_offset[i] = 0; desc_table_csum_enable[i] = 0; desc_table_len[i] = 0; desc_table_buf_ptr[i] = 0; desc_table_ptp_ts[i] = 0; desc_table_read_commit[i] = 0; desc_table_read_count_start[i] = 0; desc_table_read_count_finish[i] = 0; end end always @* begin s_axis_tx_req_ready_next = 1'b0; m_axis_tx_req_status_len_next = m_axis_tx_req_status_len_reg; m_axis_tx_req_status_tag_next = m_axis_tx_req_status_tag_reg; m_axis_tx_req_status_valid_next = 1'b0; m_axis_desc_req_queue_next = m_axis_desc_req_queue_reg; m_axis_desc_req_tag_next = m_axis_desc_req_tag_reg; m_axis_desc_req_valid_next = m_axis_desc_req_valid_reg && !m_axis_desc_req_ready; s_axis_desc_tready_next = 1'b0; m_axis_cpl_req_queue_next = m_axis_cpl_req_queue_reg; m_axis_cpl_req_tag_next = m_axis_cpl_req_tag_reg; m_axis_cpl_req_data_next = m_axis_cpl_req_data_reg; m_axis_cpl_req_valid_next = m_axis_cpl_req_valid_reg && !m_axis_cpl_req_ready; m_axis_dma_read_desc_dma_addr_next = m_axis_dma_read_desc_dma_addr_reg; m_axis_dma_read_desc_ram_addr_next = m_axis_dma_read_desc_ram_addr_reg; m_axis_dma_read_desc_len_next = m_axis_dma_read_desc_len_reg; m_axis_dma_read_desc_tag_next = m_axis_dma_read_desc_tag_reg; m_axis_dma_read_desc_valid_next = m_axis_dma_read_desc_valid_reg && !m_axis_dma_read_desc_ready; m_axis_tx_desc_addr_next = m_axis_tx_desc_addr_reg; m_axis_tx_desc_len_next = m_axis_tx_desc_len_reg; m_axis_tx_desc_tag_next = m_axis_tx_desc_tag_reg; m_axis_tx_desc_id_next = m_axis_tx_desc_id_reg; m_axis_tx_desc_dest_next = m_axis_tx_desc_dest_reg; m_axis_tx_desc_user_next = m_axis_tx_desc_user_reg; m_axis_tx_desc_valid_next = m_axis_tx_desc_valid_reg && !m_axis_tx_desc_ready; m_axis_tx_csum_cmd_csum_enable_next = m_axis_tx_csum_cmd_csum_enable_reg; m_axis_tx_csum_cmd_csum_start_next = m_axis_tx_csum_cmd_csum_start_reg; m_axis_tx_csum_cmd_csum_offset_next = m_axis_tx_csum_cmd_csum_offset_reg; m_axis_tx_csum_cmd_valid_next = m_axis_tx_csum_cmd_valid_reg && !m_axis_tx_csum_cmd_ready; s_axis_tx_cpl_ready_next = 1'b0; buf_wr_ptr_next = buf_wr_ptr_reg; buf_rd_ptr_next = buf_rd_ptr_reg; desc_start_next = desc_start_reg; desc_len_next = desc_len_reg; early_tx_req_status_len_next = early_tx_req_status_len_reg; early_tx_req_status_tag_next = early_tx_req_status_tag_reg; early_tx_req_status_valid_next = early_tx_req_status_valid_reg; finish_tx_req_status_len_next = finish_tx_req_status_len_reg; finish_tx_req_status_tag_next = finish_tx_req_status_tag_reg; finish_tx_req_status_valid_next = finish_tx_req_status_valid_reg; inc_active_desc_req = 1'b0; dec_active_desc_req_1 = 1'b0; dec_active_desc_req_2 = 1'b0; desc_table_start_tag = s_axis_tx_req_tag; desc_table_start_queue = s_axis_tx_req_queue; desc_table_start_dest = 0; desc_table_start_en = 1'b0; desc_table_dequeue_ptr = s_axis_desc_req_status_tag; desc_table_dequeue_queue_ptr = s_axis_desc_req_status_ptr; desc_table_dequeue_cpl_queue = s_axis_desc_req_status_cpl; desc_table_dequeue_invalid = 1'b0; desc_table_dequeue_en = 1'b0; desc_table_desc_ctrl_ptr = s_axis_desc_tid & DESC_PTR_MASK; desc_table_desc_ctrl_buf_ptr = buf_wr_ptr_reg; if (TX_CHECKSUM_ENABLE) begin desc_table_desc_ctrl_csum_start = s_axis_desc_tdata[23:16]; desc_table_desc_ctrl_csum_offset = s_axis_desc_tdata[30:24]; desc_table_desc_ctrl_csum_enable = s_axis_desc_tdata[31]; end else begin desc_table_desc_ctrl_csum_start = 0; desc_table_desc_ctrl_csum_offset = 0; desc_table_desc_ctrl_csum_enable = 0; end desc_table_desc_ctrl_en = 1'b0; desc_table_desc_fetched_ptr = s_axis_desc_tid & DESC_PTR_MASK; desc_table_desc_fetched_len = desc_len_reg + s_axis_desc_tdata[63:32]; desc_table_desc_fetched_en = 1'b0; desc_table_data_fetched_ptr = s_axis_dma_read_desc_status_tag & DESC_PTR_MASK; desc_table_data_fetched_en = 1'b0; desc_table_tx_start_en = 1'b0; desc_table_tx_dma_finish_ptr = s_axis_tx_desc_status_tag; desc_table_tx_dma_finish_en = 1'b0; desc_table_tx_finish_ptr = s_axis_tx_cpl_tag; desc_table_tx_finish_ts = s_axis_tx_cpl_ts; desc_table_tx_finish_en = 1'b0; desc_table_cpl_enqueue_start_en = 1'b0; desc_table_cpl_write_done_ptr = s_axis_cpl_req_status_tag & DESC_PTR_MASK; desc_table_cpl_write_done_en = 1'b0; desc_table_finish_en = 1'b0; desc_table_read_start_ptr = s_axis_desc_tid; desc_table_read_start_commit = 1'b0; desc_table_read_start_init = 1'b0; desc_table_read_start_en = 1'b0; desc_table_read_finish_ptr = s_axis_dma_read_desc_status_tag; desc_table_read_finish_en = 1'b0; // descriptor fetch // wait for transmit request s_axis_tx_req_ready_next = enable && active_desc_req_count_reg < MAX_DESC_REQ && !desc_table_active[desc_table_start_ptr_reg & DESC_PTR_MASK] && ($unsigned(desc_table_start_ptr_reg - desc_table_finish_ptr_reg) < DESC_TABLE_SIZE) && (!m_axis_desc_req_valid || m_axis_desc_req_ready); if (s_axis_tx_req_ready && s_axis_tx_req_valid) begin s_axis_tx_req_ready_next = 1'b0; // store in descriptor table desc_table_start_tag = s_axis_tx_req_tag; desc_table_start_queue = s_axis_tx_req_queue; desc_table_start_dest = s_axis_tx_req_dest; desc_table_start_en = 1'b1; // initiate descriptor fetch m_axis_desc_req_queue_next = s_axis_tx_req_queue; m_axis_desc_req_tag_next = desc_table_start_ptr_reg & DESC_PTR_MASK; m_axis_desc_req_valid_next = 1'b1; inc_active_desc_req = 1'b1; end // descriptor fetch // wait for queue query response if (s_axis_desc_req_status_valid) begin // update entry in descriptor table desc_table_dequeue_ptr = s_axis_desc_req_status_tag & DESC_PTR_MASK; desc_table_dequeue_queue_ptr = s_axis_desc_req_status_ptr; desc_table_dequeue_cpl_queue = s_axis_desc_req_status_cpl; desc_table_dequeue_invalid = 1'b0; desc_table_dequeue_en = 1'b1; if (s_axis_desc_req_status_error || s_axis_desc_req_status_empty) begin // queue empty or not active // invalidate entry desc_table_dequeue_invalid = 1'b1; // return transmit request completion early_tx_req_status_len_next = 0; early_tx_req_status_tag_next = desc_table_tag[s_axis_desc_req_status_tag & DESC_PTR_MASK]; early_tx_req_status_valid_next = 1'b1; dec_active_desc_req_1 = 1'b1; end else begin // descriptor available to dequeue // wait for descriptor end end // descriptor processing and DMA request generation // TODO descriptor validation? s_axis_desc_tready_next = !m_axis_dma_read_desc_valid && ($unsigned(buf_wr_ptr_reg - buf_rd_ptr_reg) < TX_BUFFER_SIZE - MAX_TX_SIZE); if (s_axis_desc_tready && s_axis_desc_tvalid) begin if (desc_table_active[s_axis_desc_tid & DESC_PTR_MASK]) begin desc_start_next = 1'b0; desc_len_next = desc_len_reg + s_axis_desc_tdata[63:32]; if (desc_len_next > MAX_TX_SIZE) begin desc_len_next = MAX_TX_SIZE; end desc_table_read_start_init = desc_start_reg; // update entry in descriptor table desc_table_desc_ctrl_ptr = s_axis_desc_tid & DESC_PTR_MASK; desc_table_desc_ctrl_buf_ptr = buf_wr_ptr_reg; if (TX_CHECKSUM_ENABLE) begin desc_table_desc_ctrl_csum_start = s_axis_desc_tdata[23:16]; desc_table_desc_ctrl_csum_offset = s_axis_desc_tdata[30:24]; desc_table_desc_ctrl_csum_enable = s_axis_desc_tdata[31]; end desc_table_desc_ctrl_en = desc_start_reg; // initiate data fetch to onboard RAM m_axis_dma_read_desc_dma_addr_next = s_axis_desc_tdata[127:64]; m_axis_dma_read_desc_ram_addr_next = (buf_wr_ptr_reg & TX_BUFFER_PTR_MASK) + desc_len_reg + TX_BUFFER_OFFSET; m_axis_dma_read_desc_len_next = s_axis_desc_tdata[63:32]; m_axis_dma_read_desc_tag_next = s_axis_desc_tid & DESC_PTR_MASK; desc_table_read_start_ptr = s_axis_desc_tid; if (m_axis_dma_read_desc_len_next != 0) begin m_axis_dma_read_desc_valid_next = 1'b1; // read start desc_table_read_start_en = 1'b1; s_axis_desc_tready_next = 1'b0; end if (s_axis_desc_tlast) begin // update entry in descriptor table desc_table_desc_fetched_ptr = s_axis_desc_tid & DESC_PTR_MASK; desc_table_desc_fetched_len = desc_len_next; desc_table_desc_fetched_en = 1'b1; // read commit desc_table_read_start_commit = 1'b1; // update write pointer buf_wr_ptr_next = (buf_wr_ptr_reg + desc_len_next + TX_BUFFER_PTR_MASK_LOWER) & ~TX_BUFFER_PTR_MASK_LOWER; if ((buf_wr_ptr_reg & TX_BUFFER_PTR_MASK) + desc_len_next > TX_BUFFER_SIZE - MAX_TX_SIZE) begin buf_wr_ptr_next = ~buf_wr_ptr_reg & ~TX_BUFFER_PTR_MASK; end dec_active_desc_req_2 = 1'b1; desc_start_next = 1'b1; desc_len_next = 0; end end end // data fetch completion // wait for data fetch completion if (s_axis_dma_read_desc_status_valid) begin // update entry in descriptor table desc_table_data_fetched_ptr = s_axis_dma_read_desc_status_tag & DESC_PTR_MASK; desc_table_data_fetched_en = 1'b1; // read finish desc_table_read_finish_ptr = s_axis_dma_read_desc_status_tag; desc_table_read_finish_en = 1'b1; end // transmit start // wait for data fetch completion if (desc_table_active[desc_table_tx_start_ptr_reg & DESC_PTR_MASK] && desc_table_tx_start_ptr_reg != desc_table_start_ptr_reg) begin if (desc_table_invalid[desc_table_tx_start_ptr_reg & DESC_PTR_MASK]) begin // invalid entry; skip desc_table_tx_start_en = 1'b1; //end else if (desc_table_data_fetched[desc_table_tx_start_ptr_reg & DESC_PTR_MASK] && !m_axis_tx_desc_valid && (!m_axis_tx_csum_cmd_valid || !TX_CHECKSUM_ENABLE)) begin end else if (desc_table_desc_fetched[desc_table_tx_start_ptr_reg & DESC_PTR_MASK] && desc_table_read_commit[desc_table_tx_start_ptr_reg & DESC_PTR_MASK] && (desc_table_read_count_start[desc_table_tx_start_ptr_reg & DESC_PTR_MASK] == desc_table_read_count_finish[desc_table_tx_start_ptr_reg & DESC_PTR_MASK]) && !m_axis_tx_desc_valid && (!m_axis_tx_csum_cmd_valid || !TX_CHECKSUM_ENABLE)) begin // update entry in descriptor table desc_table_tx_start_en = 1'b1; // initiate transmit operation m_axis_tx_desc_addr_next = desc_table_buf_ptr[desc_table_tx_start_ptr_reg & DESC_PTR_MASK] & TX_BUFFER_PTR_MASK + TX_BUFFER_OFFSET; m_axis_tx_desc_len_next = desc_table_len[desc_table_tx_start_ptr_reg & DESC_PTR_MASK]; m_axis_tx_desc_tag_next = desc_table_tx_start_ptr_reg & DESC_PTR_MASK; m_axis_tx_desc_id_next = desc_table_queue[desc_table_tx_start_ptr_reg & DESC_PTR_MASK]; m_axis_tx_desc_dest_next = desc_table_dest[desc_table_tx_start_ptr_reg & DESC_PTR_MASK]; m_axis_tx_desc_user_next = 0; m_axis_tx_desc_user_next[1+TX_TAG_WIDTH-1 +: 1] = 1'b1; m_axis_tx_desc_user_next[1 +: TX_TAG_WIDTH-1] = desc_table_tx_start_ptr_reg & DESC_PTR_MASK; m_axis_tx_desc_user_next[0 +: 1] = 1'b0; m_axis_tx_desc_valid_next = 1'b1; // send TX checksum command if (TX_CHECKSUM_ENABLE) begin m_axis_tx_csum_cmd_csum_enable_next = desc_table_csum_enable[desc_table_tx_start_ptr_reg & DESC_PTR_MASK]; m_axis_tx_csum_cmd_csum_start_next = desc_table_csum_start[desc_table_tx_start_ptr_reg & DESC_PTR_MASK]; m_axis_tx_csum_cmd_csum_offset_next = desc_table_csum_start[desc_table_tx_start_ptr_reg & DESC_PTR_MASK] + desc_table_csum_offset[desc_table_tx_start_ptr_reg & DESC_PTR_MASK]; m_axis_tx_csum_cmd_valid_next = 1'b1; end end end // transmit DMA done // wait for transmit DMA completion; free buffer space if (s_axis_tx_desc_status_valid) begin // update entry in descriptor table desc_table_tx_dma_finish_ptr = s_axis_tx_desc_status_tag; desc_table_tx_dma_finish_en = 1'b1; // update read pointer buf_rd_ptr_next = (desc_table_buf_ptr[s_axis_tx_desc_status_tag & DESC_PTR_MASK] + desc_table_len[s_axis_tx_desc_status_tag & DESC_PTR_MASK] + TX_BUFFER_PTR_MASK_LOWER) & ~TX_BUFFER_PTR_MASK_LOWER; if ((desc_table_buf_ptr[s_axis_tx_desc_status_tag & DESC_PTR_MASK] & TX_BUFFER_PTR_MASK) + desc_table_len[s_axis_tx_desc_status_tag & DESC_PTR_MASK] > TX_BUFFER_SIZE - MAX_TX_SIZE) begin buf_rd_ptr_next = ~desc_table_buf_ptr[s_axis_tx_desc_status_tag & DESC_PTR_MASK] & ~TX_BUFFER_PTR_MASK; end end // transmit done // wait for transmit completion; store PTP timestamp s_axis_tx_cpl_ready_next = 1'b1; if (s_axis_tx_cpl_valid && s_axis_tx_cpl_tag[TX_TAG_WIDTH-1]) begin desc_table_tx_finish_ptr = s_axis_tx_cpl_tag; desc_table_tx_finish_ts = s_axis_tx_cpl_ts; desc_table_tx_finish_en = 1'b1; end // finish transmit; start completion enqueue if (desc_table_active[desc_table_cpl_enqueue_start_ptr_reg & DESC_PTR_MASK] && desc_table_cpl_enqueue_start_ptr_reg != desc_table_start_ptr_reg && desc_table_cpl_enqueue_start_ptr_reg != desc_table_tx_start_ptr_reg) begin if (desc_table_invalid[desc_table_cpl_enqueue_start_ptr_reg & DESC_PTR_MASK]) begin // invalid entry; skip desc_table_cpl_enqueue_start_en = 1'b1; end else if (desc_table_tx_done_a[desc_table_cpl_enqueue_start_ptr_reg & DESC_PTR_MASK] != desc_table_tx_done_b[desc_table_cpl_enqueue_start_ptr_reg & DESC_PTR_MASK] && !m_axis_cpl_req_valid_next) begin // update entry in descriptor table desc_table_cpl_enqueue_start_en = 1'b1; // initiate queue query m_axis_cpl_req_queue_next = desc_table_cpl_queue[desc_table_cpl_enqueue_start_ptr_reg & DESC_PTR_MASK]; m_axis_cpl_req_tag_next = desc_table_cpl_enqueue_start_ptr_reg & DESC_PTR_MASK; m_axis_cpl_req_data_next = 0; m_axis_cpl_req_data_next[15:0] = desc_table_queue[desc_table_cpl_enqueue_start_ptr_reg & DESC_PTR_MASK]; m_axis_cpl_req_data_next[31:16] = desc_table_queue_ptr[desc_table_cpl_enqueue_start_ptr_reg & DESC_PTR_MASK]; m_axis_cpl_req_data_next[47:32] = desc_table_len[desc_table_cpl_enqueue_start_ptr_reg & DESC_PTR_MASK]; if (PTP_TS_ENABLE) begin //m_axis_cpl_req_data_next[127:64] = desc_table_ptp_ts[desc_table_cpl_enqueue_start_ptr_reg & DESC_PTR_MASK] >> 16; m_axis_cpl_req_data_next[111:64] = desc_table_ptp_ts[desc_table_cpl_enqueue_start_ptr_reg & DESC_PTR_MASK] >> 16; end m_axis_cpl_req_data_next[176:168] = desc_table_dest[desc_table_cpl_enqueue_start_ptr_reg & DESC_PTR_MASK]; m_axis_cpl_req_valid_next = 1'b1; end end // start completion write // wait for queue query response if (s_axis_cpl_req_status_valid) begin // update entry in descriptor table desc_table_cpl_write_done_ptr = s_axis_cpl_req_status_tag & DESC_PTR_MASK; desc_table_cpl_write_done_en = 1'b1; end // operation complete if (desc_table_active[desc_table_finish_ptr_reg & DESC_PTR_MASK] && desc_table_finish_ptr_reg != desc_table_start_ptr_reg && desc_table_finish_ptr_reg != desc_table_cpl_enqueue_start_ptr_reg && !finish_tx_req_status_valid_reg) begin if (desc_table_invalid[desc_table_finish_ptr_reg & DESC_PTR_MASK]) begin // invalidate entry in descriptor table desc_table_finish_en = 1'b1; end else if (desc_table_cpl_write_done[desc_table_finish_ptr_reg & DESC_PTR_MASK]) begin // invalidate entry in descriptor table desc_table_finish_en = 1'b1; // return transmit request completion finish_tx_req_status_len_next = desc_table_len[desc_table_finish_ptr_reg & DESC_PTR_MASK]; finish_tx_req_status_tag_next = desc_table_tag[desc_table_finish_ptr_reg & DESC_PTR_MASK]; finish_tx_req_status_valid_next = 1'b1; end end // transmit request completion arbitration if (finish_tx_req_status_valid_next && !m_axis_tx_req_status_valid_reg) begin m_axis_tx_req_status_len_next = finish_tx_req_status_len_next; m_axis_tx_req_status_tag_next = finish_tx_req_status_tag_next; m_axis_tx_req_status_valid_next = 1'b1; finish_tx_req_status_valid_next = 1'b0; end else if (early_tx_req_status_valid_next && !m_axis_tx_req_status_valid_reg) begin m_axis_tx_req_status_len_next = early_tx_req_status_len_next; m_axis_tx_req_status_tag_next = early_tx_req_status_tag_next; m_axis_tx_req_status_valid_next = 1'b1; early_tx_req_status_valid_next = 1'b0; end end always @(posedge clk) begin s_axis_tx_req_ready_reg <= s_axis_tx_req_ready_next; m_axis_tx_req_status_len_reg <= m_axis_tx_req_status_len_next; m_axis_tx_req_status_tag_reg <= m_axis_tx_req_status_tag_next; m_axis_tx_req_status_valid_reg <= m_axis_tx_req_status_valid_next; m_axis_desc_req_queue_reg <= m_axis_desc_req_queue_next; m_axis_desc_req_tag_reg <= m_axis_desc_req_tag_next; m_axis_desc_req_valid_reg <= m_axis_desc_req_valid_next; s_axis_desc_tready_reg <= s_axis_desc_tready_next; m_axis_cpl_req_queue_reg <= m_axis_cpl_req_queue_next; m_axis_cpl_req_tag_reg <= m_axis_cpl_req_tag_next; m_axis_cpl_req_data_reg <= m_axis_cpl_req_data_next; m_axis_cpl_req_valid_reg <= m_axis_cpl_req_valid_next; m_axis_dma_read_desc_dma_addr_reg <= m_axis_dma_read_desc_dma_addr_next; m_axis_dma_read_desc_ram_addr_reg <= m_axis_dma_read_desc_ram_addr_next; m_axis_dma_read_desc_len_reg <= m_axis_dma_read_desc_len_next; m_axis_dma_read_desc_tag_reg <= m_axis_dma_read_desc_tag_next; m_axis_dma_read_desc_valid_reg <= m_axis_dma_read_desc_valid_next; m_axis_tx_desc_addr_reg <= m_axis_tx_desc_addr_next; m_axis_tx_desc_len_reg <= m_axis_tx_desc_len_next; m_axis_tx_desc_tag_reg <= m_axis_tx_desc_tag_next; m_axis_tx_desc_id_reg <= m_axis_tx_desc_id_next; m_axis_tx_desc_dest_reg <= m_axis_tx_desc_dest_next; m_axis_tx_desc_user_reg <= m_axis_tx_desc_user_next; m_axis_tx_desc_valid_reg <= m_axis_tx_desc_valid_next; s_axis_tx_cpl_ready_reg <= s_axis_tx_cpl_ready_next; m_axis_tx_csum_cmd_csum_enable_reg <= m_axis_tx_csum_cmd_csum_enable_next; m_axis_tx_csum_cmd_csum_start_reg <= m_axis_tx_csum_cmd_csum_start_next; m_axis_tx_csum_cmd_csum_offset_reg <= m_axis_tx_csum_cmd_csum_offset_next; m_axis_tx_csum_cmd_valid_reg <= m_axis_tx_csum_cmd_valid_next; buf_wr_ptr_reg <= buf_wr_ptr_next; buf_rd_ptr_reg <= buf_rd_ptr_next; desc_start_reg <= desc_start_next; desc_len_reg <= desc_len_next; early_tx_req_status_len_reg <= early_tx_req_status_len_next; early_tx_req_status_tag_reg <= early_tx_req_status_tag_next; early_tx_req_status_valid_reg <= early_tx_req_status_valid_next; finish_tx_req_status_len_reg <= finish_tx_req_status_len_next; finish_tx_req_status_tag_reg <= finish_tx_req_status_tag_next; finish_tx_req_status_valid_reg <= finish_tx_req_status_valid_next; active_desc_req_count_reg <= active_desc_req_count_reg + inc_active_desc_req - dec_active_desc_req_1 - dec_active_desc_req_2; // descriptor table operations if (desc_table_start_en) begin desc_table_active[desc_table_start_ptr_reg & DESC_PTR_MASK] <= 1'b1; desc_table_invalid[desc_table_start_ptr_reg & DESC_PTR_MASK] <= 1'b0; desc_table_desc_fetched[desc_table_start_ptr_reg & DESC_PTR_MASK] <= 1'b0; desc_table_data_fetched[desc_table_start_ptr_reg & DESC_PTR_MASK] <= 1'b0; desc_table_tx_done_a[desc_table_start_ptr_reg & DESC_PTR_MASK] <= desc_table_tx_done_b[desc_table_start_ptr_reg & DESC_PTR_MASK]; desc_table_cpl_write_done[desc_table_start_ptr_reg & DESC_PTR_MASK] <= 1'b0; desc_table_queue[desc_table_start_ptr_reg & DESC_PTR_MASK] <= desc_table_start_queue; desc_table_tag[desc_table_start_ptr_reg & DESC_PTR_MASK] <= desc_table_start_tag; desc_table_dest[desc_table_start_ptr_reg & DESC_PTR_MASK] <= desc_table_start_dest; desc_table_start_ptr_reg <= desc_table_start_ptr_reg + 1; end if (desc_table_dequeue_en) begin desc_table_queue_ptr[desc_table_dequeue_ptr & DESC_PTR_MASK] <= desc_table_dequeue_queue_ptr; desc_table_cpl_queue[desc_table_dequeue_ptr & DESC_PTR_MASK] <= desc_table_dequeue_cpl_queue; if (desc_table_dequeue_invalid) begin desc_table_invalid[desc_table_dequeue_ptr & DESC_PTR_MASK] <= 1'b1; end end if (desc_table_desc_ctrl_en) begin desc_table_buf_ptr[desc_table_desc_ctrl_ptr & DESC_PTR_MASK] <= desc_table_desc_ctrl_buf_ptr; desc_table_csum_start[desc_table_desc_ctrl_ptr & DESC_PTR_MASK] <= desc_table_desc_ctrl_csum_start; desc_table_csum_offset[desc_table_desc_ctrl_ptr & DESC_PTR_MASK] <= desc_table_desc_ctrl_csum_offset; desc_table_csum_enable[desc_table_desc_ctrl_ptr & DESC_PTR_MASK] <= desc_table_desc_ctrl_csum_enable; end if (desc_table_desc_fetched_en) begin desc_table_len[desc_table_desc_fetched_ptr & DESC_PTR_MASK] <= desc_table_desc_fetched_len; desc_table_desc_fetched[desc_table_desc_fetched_ptr & DESC_PTR_MASK] <= 1'b1; end if (desc_table_data_fetched_en) begin desc_table_data_fetched[desc_table_data_fetched_ptr & DESC_PTR_MASK] <= 1'b1; end if (desc_table_tx_start_en) begin desc_table_data_fetched[desc_table_tx_start_ptr_reg & DESC_PTR_MASK] <= 1'b0; desc_table_tx_start_ptr_reg <= desc_table_tx_start_ptr_reg + 1; end if (desc_table_tx_finish_en) begin if (PTP_TS_ENABLE) begin desc_table_ptp_ts[desc_table_tx_finish_ptr] <= desc_table_tx_finish_ts; end desc_table_tx_done_b[desc_table_tx_finish_ptr] <= !desc_table_tx_done_a[desc_table_tx_finish_ptr]; end if (desc_table_cpl_enqueue_start_en) begin desc_table_cpl_enqueue_start_ptr_reg <= desc_table_cpl_enqueue_start_ptr_reg + 1; end if (desc_table_cpl_write_done_en) begin desc_table_cpl_write_done[desc_table_cpl_write_done_ptr] <= 1'b1; end if (desc_table_finish_en) begin desc_table_active[desc_table_finish_ptr_reg & DESC_PTR_MASK] <= 1'b0; desc_table_finish_ptr_reg <= desc_table_finish_ptr_reg + 1; end if (desc_table_read_start_en) begin desc_table_read_commit[desc_table_read_start_ptr] <= desc_table_read_start_commit; if (desc_table_read_start_init) begin desc_table_read_count_start[desc_table_read_start_ptr] <= desc_table_read_count_finish[desc_table_read_start_ptr] + 1; end else begin desc_table_read_count_start[desc_table_read_start_ptr] <= desc_table_read_count_start[desc_table_read_start_ptr] + 1; end end else if (desc_table_read_start_commit || desc_table_read_start_init) begin desc_table_read_commit[desc_table_read_start_ptr] <= desc_table_read_start_commit; if (desc_table_read_start_init) begin desc_table_read_count_start[desc_table_read_start_ptr] <= desc_table_read_count_finish[desc_table_read_start_ptr]; end end if (desc_table_read_finish_en) begin desc_table_read_count_finish[desc_table_read_finish_ptr] <= desc_table_read_count_finish[desc_table_read_finish_ptr] + 1; end if (rst) begin s_axis_tx_req_ready_reg <= 1'b0; m_axis_tx_req_status_valid_reg <= 1'b0; m_axis_desc_req_valid_reg <= 1'b0; s_axis_desc_tready_reg <= 1'b0; m_axis_cpl_req_valid_reg <= 1'b0; m_axis_dma_read_desc_valid_reg <= 1'b0; m_axis_tx_desc_valid_reg <= 1'b0; s_axis_tx_cpl_ready_reg <= 1'b0; m_axis_tx_csum_cmd_valid_reg <= 1'b0; buf_wr_ptr_reg <= 0; buf_rd_ptr_reg <= 0; desc_start_reg <= 1'b1; desc_len_reg <= 0; early_tx_req_status_valid_reg <= 1'b0; finish_tx_req_status_valid_reg <= 1'b0; active_desc_req_count_reg <= 0; desc_table_active <= 0; desc_table_invalid <= 0; desc_table_desc_fetched <= 0; desc_table_data_fetched <= 0; desc_table_start_ptr_reg <= 0; desc_table_tx_start_ptr_reg <= 0; desc_table_cpl_enqueue_start_ptr_reg <= 0; desc_table_finish_ptr_reg <= 0; end end endmodule `resetall