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corundum/rtl/dma_if_axi_rd.v
Alex Forencich b3145508ed Remove debug code
2021-11-16 00:10:50 -08:00

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/*
Copyright (c) 2021 Alex Forencich
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/
// Language: Verilog 2001
`resetall
`timescale 1ns / 1ps
`default_nettype none
/*
* AXI DMA read interface
*/
module dma_if_axi_rd #
(
// Width of AXI data bus in bits
parameter AXI_DATA_WIDTH = 32,
// Width of AXI address bus in bits
parameter AXI_ADDR_WIDTH = 16,
// Width of AXI wstrb (width of data bus in words)
parameter AXI_STRB_WIDTH = (AXI_DATA_WIDTH/8),
// Width of AXI ID signal
parameter AXI_ID_WIDTH = 8,
// Maximum AXI burst length to generate
parameter AXI_MAX_BURST_LEN = 256,
// RAM segment count
parameter RAM_SEG_COUNT = 2,
// RAM segment data width
parameter RAM_SEG_DATA_WIDTH = AXI_DATA_WIDTH*2/RAM_SEG_COUNT,
// RAM segment address width
parameter RAM_SEG_ADDR_WIDTH = 8,
// RAM segment byte enable width
parameter RAM_SEG_BE_WIDTH = RAM_SEG_DATA_WIDTH/8,
// RAM select width
parameter RAM_SEL_WIDTH = 2,
// RAM address width
parameter RAM_ADDR_WIDTH = RAM_SEG_ADDR_WIDTH+$clog2(RAM_SEG_COUNT)+$clog2(RAM_SEG_BE_WIDTH),
// Length field width
parameter LEN_WIDTH = 16,
// Tag field width
parameter TAG_WIDTH = 8,
// Operation table size
parameter OP_TABLE_SIZE = 2**(AXI_ID_WIDTH),
// Use AXI ID signals
parameter USE_AXI_ID = 1
)
(
input wire clk,
input wire rst,
/*
* AXI master interface
*/
output wire [AXI_ID_WIDTH-1:0] m_axi_arid,
output wire [AXI_ADDR_WIDTH-1:0] m_axi_araddr,
output wire [7:0] m_axi_arlen,
output wire [2:0] m_axi_arsize,
output wire [1:0] m_axi_arburst,
output wire m_axi_arlock,
output wire [3:0] m_axi_arcache,
output wire [2:0] m_axi_arprot,
output wire m_axi_arvalid,
input wire m_axi_arready,
input wire [AXI_ID_WIDTH-1:0] m_axi_rid,
input wire [AXI_DATA_WIDTH-1:0] m_axi_rdata,
input wire [1:0] m_axi_rresp,
input wire m_axi_rlast,
input wire m_axi_rvalid,
output wire m_axi_rready,
/*
* AXI read descriptor input
*/
input wire [AXI_ADDR_WIDTH-1:0] s_axis_read_desc_axi_addr,
input wire [RAM_SEL_WIDTH-1:0] s_axis_read_desc_ram_sel,
input wire [RAM_ADDR_WIDTH-1:0] s_axis_read_desc_ram_addr,
input wire [LEN_WIDTH-1:0] s_axis_read_desc_len,
input wire [TAG_WIDTH-1:0] s_axis_read_desc_tag,
input wire s_axis_read_desc_valid,
output wire s_axis_read_desc_ready,
/*
* AXI read descriptor status output
*/
output wire [TAG_WIDTH-1:0] m_axis_read_desc_status_tag,
output wire [3:0] m_axis_read_desc_status_error,
output wire m_axis_read_desc_status_valid,
/*
* RAM interface
*/
output wire [RAM_SEG_COUNT*RAM_SEL_WIDTH-1:0] ram_wr_cmd_sel,
output wire [RAM_SEG_COUNT*RAM_SEG_BE_WIDTH-1:0] ram_wr_cmd_be,
output wire [RAM_SEG_COUNT*RAM_SEG_ADDR_WIDTH-1:0] ram_wr_cmd_addr,
output wire [RAM_SEG_COUNT*RAM_SEG_DATA_WIDTH-1:0] ram_wr_cmd_data,
output wire [RAM_SEG_COUNT-1:0] ram_wr_cmd_valid,
input wire [RAM_SEG_COUNT-1:0] ram_wr_cmd_ready,
input wire [RAM_SEG_COUNT-1:0] ram_wr_done,
/*
* Configuration
*/
input wire enable
);
parameter RAM_WORD_WIDTH = RAM_SEG_BE_WIDTH;
parameter RAM_WORD_SIZE = RAM_SEG_DATA_WIDTH/RAM_WORD_WIDTH;
parameter AXI_WORD_WIDTH = AXI_STRB_WIDTH;
parameter AXI_WORD_SIZE = AXI_DATA_WIDTH/AXI_WORD_WIDTH;
parameter AXI_BURST_SIZE = $clog2(AXI_STRB_WIDTH);
parameter AXI_MAX_BURST_SIZE = AXI_MAX_BURST_LEN << AXI_BURST_SIZE;
parameter OFFSET_WIDTH = AXI_STRB_WIDTH > 1 ? $clog2(AXI_STRB_WIDTH) : 1;
parameter OFFSET_MASK = AXI_STRB_WIDTH > 1 ? {OFFSET_WIDTH{1'b1}} : 0;
parameter RAM_OFFSET_WIDTH = $clog2(RAM_SEG_COUNT*RAM_SEG_BE_WIDTH);
parameter ADDR_MASK = {AXI_ADDR_WIDTH{1'b1}} << $clog2(AXI_STRB_WIDTH);
parameter CYCLE_COUNT_WIDTH = LEN_WIDTH - AXI_BURST_SIZE + 1;
parameter OP_TAG_WIDTH = $clog2(OP_TABLE_SIZE);
parameter OP_TABLE_READ_COUNT_WIDTH = AXI_ID_WIDTH+1;
parameter OP_TABLE_WRITE_COUNT_WIDTH = LEN_WIDTH;
parameter STATUS_FIFO_ADDR_WIDTH = 5;
parameter OUTPUT_FIFO_ADDR_WIDTH = 5;
// bus width assertions
initial begin
if (AXI_WORD_SIZE * AXI_STRB_WIDTH != AXI_DATA_WIDTH) begin
$error("Error: AXI data width not evenly divisble (instance %m)");
$finish;
end
if (AXI_WORD_SIZE != RAM_WORD_SIZE) begin
$error("Error: word size mismatch (instance %m)");
$finish;
end
if (2**$clog2(AXI_WORD_WIDTH) != AXI_WORD_WIDTH) begin
$error("Error: AXI word width must be even power of two (instance %m)");
$finish;
end
if (AXI_MAX_BURST_LEN < 1 || AXI_MAX_BURST_LEN > 256) begin
$error("Error: AXI_MAX_BURST_LEN must be between 1 and 256 (instance %m)");
$finish;
end
if (RAM_SEG_COUNT < 2) begin
$error("Error: RAM interface requires at least 2 segments (instance %m)");
$finish;
end
if (RAM_SEG_COUNT*RAM_SEG_DATA_WIDTH != AXI_DATA_WIDTH*2) begin
$error("Error: RAM interface width must be double the AXI interface width (instance %m)");
$finish;
end
if (2**$clog2(RAM_WORD_WIDTH) != RAM_WORD_WIDTH) begin
$error("Error: RAM word width must be even power of two (instance %m)");
$finish;
end
if (RAM_ADDR_WIDTH != RAM_SEG_ADDR_WIDTH+$clog2(RAM_SEG_COUNT)+$clog2(RAM_SEG_BE_WIDTH)) begin
$error("Error: RAM_ADDR_WIDTH does not match RAM configuration (instance %m)");
$finish;
end
end
localparam [1:0]
AXI_RESP_OKAY = 2'b00,
AXI_RESP_EXOKAY = 2'b01,
AXI_RESP_SLVERR = 2'b10,
AXI_RESP_DECERR = 2'b11;
localparam [3:0]
DMA_ERROR_NONE = 4'd0,
DMA_ERROR_TIMEOUT = 4'd1,
DMA_ERROR_PARITY = 4'd2,
DMA_ERROR_AXI_RD_SLVERR = 4'd4,
DMA_ERROR_AXI_RD_DECERR = 4'd5,
DMA_ERROR_AXI_WR_SLVERR = 4'd6,
DMA_ERROR_AXI_WR_DECERR = 4'd7,
DMA_ERROR_PCIE_FLR = 4'd8,
DMA_ERROR_PCIE_CPL_POISONED = 4'd9,
DMA_ERROR_PCIE_CPL_STATUS_UR = 4'd10,
DMA_ERROR_PCIE_CPL_STATUS_CA = 4'd11;
localparam [0:0]
REQ_STATE_IDLE = 1'd0,
REQ_STATE_START = 1'd1;
reg [0:0] req_state_reg = REQ_STATE_IDLE, req_state_next;
localparam [0:0]
AXI_STATE_IDLE = 1'd0,
AXI_STATE_WRITE = 1'd1;
reg [0:0] axi_state_reg = AXI_STATE_IDLE, axi_state_next;
reg [AXI_ADDR_WIDTH-1:0] req_axi_addr_reg = {AXI_ADDR_WIDTH{1'b0}}, req_axi_addr_next;
reg [RAM_SEL_WIDTH-1:0] req_ram_sel_reg = {RAM_SEL_WIDTH{1'b0}}, req_ram_sel_next;
reg [RAM_ADDR_WIDTH-1:0] req_ram_addr_reg = {RAM_ADDR_WIDTH{1'b0}}, req_ram_addr_next;
reg [LEN_WIDTH-1:0] req_op_count_reg = {LEN_WIDTH{1'b0}}, req_op_count_next;
reg [LEN_WIDTH-1:0] req_tr_count_reg = {LEN_WIDTH{1'b0}}, req_tr_count_next;
reg [TAG_WIDTH-1:0] req_tag_reg = {TAG_WIDTH{1'b0}}, req_tag_next;
reg [RAM_SEL_WIDTH-1:0] ram_sel_reg = {RAM_SEL_WIDTH{1'b0}}, ram_sel_next;
reg [RAM_ADDR_WIDTH-1:0] addr_reg = {RAM_ADDR_WIDTH{1'b0}}, addr_next;
reg [RAM_ADDR_WIDTH-1:0] addr_delay_reg = {RAM_ADDR_WIDTH{1'b0}}, addr_delay_next;
reg [12:0] op_count_reg = 13'd0, op_count_next;
reg [RAM_SEG_COUNT-1:0] ram_mask_reg = {RAM_SEG_COUNT{1'b0}}, ram_mask_next;
reg [RAM_SEG_COUNT-1:0] ram_mask_0_reg = {RAM_SEG_COUNT{1'b0}}, ram_mask_0_next;
reg [RAM_SEG_COUNT-1:0] ram_mask_1_reg = {RAM_SEG_COUNT{1'b0}}, ram_mask_1_next;
reg ram_wrap_reg = 1'b0, ram_wrap_next;
reg [OFFSET_WIDTH+1-1:0] cycle_byte_count_reg = {OFFSET_WIDTH+1{1'b0}}, cycle_byte_count_next;
reg [RAM_OFFSET_WIDTH-1:0] start_offset_reg = {RAM_OFFSET_WIDTH{1'b0}}, start_offset_next;
reg [RAM_OFFSET_WIDTH-1:0] end_offset_reg = {RAM_OFFSET_WIDTH{1'b0}}, end_offset_next;
reg [OFFSET_WIDTH-1:0] offset_reg = {OFFSET_WIDTH{1'b0}}, offset_next;
reg [OP_TAG_WIDTH-1:0] op_tag_reg = {OP_TAG_WIDTH{1'b0}}, op_tag_next;
reg [STATUS_FIFO_ADDR_WIDTH+1-1:0] status_fifo_wr_ptr_reg = 0;
reg [STATUS_FIFO_ADDR_WIDTH+1-1:0] status_fifo_rd_ptr_reg = 0, status_fifo_rd_ptr_next;
(* ram_style = "distributed", ramstyle = "no_rw_check, mlab" *)
reg [OP_TAG_WIDTH-1:0] status_fifo_op_tag[(2**STATUS_FIFO_ADDR_WIDTH)-1:0];
(* ram_style = "distributed", ramstyle = "no_rw_check, mlab" *)
reg [RAM_SEG_COUNT-1:0] status_fifo_mask[(2**STATUS_FIFO_ADDR_WIDTH)-1:0];
(* ram_style = "distributed", ramstyle = "no_rw_check, mlab" *)
reg status_fifo_finish[(2**STATUS_FIFO_ADDR_WIDTH)-1:0];
reg [OP_TAG_WIDTH-1:0] status_fifo_wr_op_tag;
reg [RAM_SEG_COUNT-1:0] status_fifo_wr_mask;
reg status_fifo_wr_finish;
reg status_fifo_we;
reg status_fifo_finish_reg = 1'b0, status_fifo_finish_next;
reg status_fifo_we_reg = 1'b0, status_fifo_we_next;
reg status_fifo_half_full_reg = 1'b0;
reg [OP_TAG_WIDTH-1:0] status_fifo_rd_op_tag_reg = 0, status_fifo_rd_op_tag_next;
reg [RAM_SEG_COUNT-1:0] status_fifo_rd_mask_reg = 0, status_fifo_rd_mask_next;
reg status_fifo_rd_finish_reg = 1'b0, status_fifo_rd_finish_next;
reg status_fifo_rd_valid_reg = 1'b0, status_fifo_rd_valid_next;
reg [AXI_DATA_WIDTH-1:0] m_axi_rdata_int_reg = {AXI_DATA_WIDTH{1'b0}}, m_axi_rdata_int_next;
reg m_axi_rvalid_int_reg = 1'b0, m_axi_rvalid_int_next;
reg [AXI_ID_WIDTH-1:0] m_axi_arid_reg = {AXI_ID_WIDTH{1'b0}}, m_axi_arid_next;
reg [AXI_ADDR_WIDTH-1:0] m_axi_araddr_reg = {AXI_ADDR_WIDTH{1'b0}}, m_axi_araddr_next;
reg [7:0] m_axi_arlen_reg = 8'd0, m_axi_arlen_next;
reg m_axi_arvalid_reg = 1'b0, m_axi_arvalid_next;
reg m_axi_rready_reg = 1'b0, m_axi_rready_next;
reg s_axis_read_desc_ready_reg = 1'b0, s_axis_read_desc_ready_next;
reg [TAG_WIDTH-1:0] m_axis_read_desc_status_tag_reg = {TAG_WIDTH{1'b0}}, m_axis_read_desc_status_tag_next;
reg [3:0] m_axis_read_desc_status_error_reg = 4'd0, m_axis_read_desc_status_error_next;
reg m_axis_read_desc_status_valid_reg = 1'b0, m_axis_read_desc_status_valid_next;
// internal datapath
reg [RAM_SEG_COUNT*RAM_SEL_WIDTH-1:0] ram_wr_cmd_sel_int;
reg [RAM_SEG_COUNT*RAM_SEG_BE_WIDTH-1:0] ram_wr_cmd_be_int;
reg [RAM_SEG_COUNT*RAM_SEG_ADDR_WIDTH-1:0] ram_wr_cmd_addr_int;
reg [RAM_SEG_COUNT*RAM_SEG_DATA_WIDTH-1:0] ram_wr_cmd_data_int;
reg [RAM_SEG_COUNT-1:0] ram_wr_cmd_valid_int;
reg [RAM_SEG_COUNT-1:0] ram_wr_cmd_ready_int;
wire [RAM_SEG_COUNT-1:0] out_done;
reg [RAM_SEG_COUNT-1:0] out_done_ack;
assign m_axi_arid = m_axi_arid_reg;
assign m_axi_araddr = m_axi_araddr_reg;
assign m_axi_arlen = m_axi_arlen_reg;
assign m_axi_arsize = AXI_BURST_SIZE;
assign m_axi_arburst = 2'b01;
assign m_axi_arlock = 1'b0;
assign m_axi_arcache = 4'b0011;
assign m_axi_arprot = 3'b010;
assign m_axi_arvalid = m_axi_arvalid_reg;
assign m_axi_rready = m_axi_rready_reg;
assign s_axis_read_desc_ready = s_axis_read_desc_ready_reg;
assign m_axis_read_desc_status_tag = m_axis_read_desc_status_tag_reg;
assign m_axis_read_desc_status_error = m_axis_read_desc_status_error_reg;
assign m_axis_read_desc_status_valid = m_axis_read_desc_status_valid_reg;
// operation tag management
reg [OP_TAG_WIDTH+1-1:0] op_table_start_ptr_reg = 0;
reg [AXI_ADDR_WIDTH-1:0] op_table_start_axi_addr;
reg [RAM_SEL_WIDTH-1:0] op_table_start_ram_sel;
reg [RAM_ADDR_WIDTH-1:0] op_table_start_ram_addr;
reg [11:0] op_table_start_len;
reg [CYCLE_COUNT_WIDTH-1:0] op_table_start_cycle_count;
reg [TAG_WIDTH-1:0] op_table_start_tag;
reg op_table_start_last;
reg op_table_start_en;
reg op_table_write_complete_en;
reg [OP_TAG_WIDTH-1:0] op_table_write_complete_ptr;
reg [OP_TAG_WIDTH+1-1:0] op_table_finish_ptr_reg = 0;
reg op_table_finish_en;
reg [2**OP_TAG_WIDTH-1:0] op_table_active = 0;
(* ram_style = "distributed", ramstyle = "no_rw_check, mlab" *)
reg [AXI_ADDR_WIDTH-1:0] op_table_axi_addr [2**OP_TAG_WIDTH-1:0];
(* ram_style = "distributed", ramstyle = "no_rw_check, mlab" *)
reg [RAM_SEL_WIDTH-1:0] op_table_ram_sel [2**OP_TAG_WIDTH-1:0];
(* ram_style = "distributed", ramstyle = "no_rw_check, mlab" *)
reg [RAM_ADDR_WIDTH-1:0] op_table_ram_addr [2**OP_TAG_WIDTH-1:0];
(* ram_style = "distributed", ramstyle = "no_rw_check, mlab" *)
reg [11:0] op_table_len[2**OP_TAG_WIDTH-1:0];
(* ram_style = "distributed", ramstyle = "no_rw_check, mlab" *)
reg [CYCLE_COUNT_WIDTH-1:0] op_table_cycle_count[2**OP_TAG_WIDTH-1:0];
(* ram_style = "distributed", ramstyle = "no_rw_check, mlab" *)
reg [TAG_WIDTH-1:0] op_table_tag[2**OP_TAG_WIDTH-1:0];
(* ram_style = "distributed", ramstyle = "no_rw_check, mlab" *)
reg op_table_last[2**OP_TAG_WIDTH-1:0];
(* ram_style = "distributed", ramstyle = "no_rw_check, mlab" *)
reg op_table_write_complete[2**OP_TAG_WIDTH-1:0];
integer i;
initial begin
for (i = 0; i < 2**OP_TAG_WIDTH; i = i + 1) begin
op_table_axi_addr[i] = 0;
op_table_ram_sel[i] = 0;
op_table_ram_addr[i] = 0;
op_table_len[i] = 0;
op_table_cycle_count[i] = 0;
op_table_tag[i] = 0;
op_table_last[i] = 0;
op_table_write_complete[i] = 0;
end
end
always @* begin
req_state_next = REQ_STATE_IDLE;
s_axis_read_desc_ready_next = 1'b0;
req_axi_addr_next = req_axi_addr_reg;
req_ram_sel_next = req_ram_sel_reg;
req_ram_addr_next = req_ram_addr_reg;
req_op_count_next = req_op_count_reg;
req_tr_count_next = req_tr_count_reg;
req_tag_next = req_tag_reg;
m_axi_arid_next = m_axi_arid_reg;
m_axi_araddr_next = m_axi_araddr_reg;
m_axi_arlen_next = m_axi_arlen_reg;
m_axi_arvalid_next = m_axi_arvalid_reg && !m_axi_arready;
op_table_start_axi_addr = req_axi_addr_reg;
op_table_start_ram_sel = req_ram_sel_reg;
op_table_start_ram_addr = req_ram_addr_reg;
op_table_start_len = 0;
op_table_start_tag = req_tag_reg;
op_table_start_cycle_count = 0;
op_table_start_last = 0;
op_table_start_en = 1'b0;
// segmentation and request generation
case (req_state_reg)
REQ_STATE_IDLE: begin
s_axis_read_desc_ready_next = !op_table_active[op_table_start_ptr_reg[OP_TAG_WIDTH-1:0]] && ($unsigned(op_table_start_ptr_reg - op_table_finish_ptr_reg) < 2**OP_TAG_WIDTH) && enable;
req_axi_addr_next = s_axis_read_desc_axi_addr;
req_ram_sel_next = s_axis_read_desc_ram_sel;
req_ram_addr_next = s_axis_read_desc_ram_addr;
req_op_count_next = s_axis_read_desc_len;
req_tag_next = s_axis_read_desc_tag;
if (req_op_count_next <= AXI_MAX_BURST_SIZE - (req_axi_addr_next & OFFSET_MASK) || AXI_MAX_BURST_SIZE >= 4096) begin
// packet smaller than max burst size
if (((req_axi_addr_next & 12'hfff) + (req_op_count_next & 12'hfff)) >> 12 != 0 || req_op_count_next >> 12 != 0) begin
// crosses 4k boundary
req_tr_count_next = 13'h1000 - req_axi_addr_next[11:0];
end else begin
// does not cross 4k boundary
req_tr_count_next = req_op_count_next;
end
end else begin
// packet larger than max burst size
if (((req_axi_addr_next & 12'hfff) + AXI_MAX_BURST_SIZE) >> 12 != 0) begin
// crosses 4k boundary
req_tr_count_next = 13'h1000 - req_axi_addr_next[11:0];
end else begin
// does not cross 4k boundary
req_tr_count_next = AXI_MAX_BURST_SIZE - (req_axi_addr_next & OFFSET_MASK);
end
end
if (s_axis_read_desc_ready && s_axis_read_desc_valid) begin
s_axis_read_desc_ready_next = 1'b0;
req_state_next = REQ_STATE_START;
end else begin
req_state_next = REQ_STATE_IDLE;
end
end
REQ_STATE_START: begin
if (!op_table_active[op_table_start_ptr_reg[OP_TAG_WIDTH-1:0]] && ($unsigned(op_table_start_ptr_reg - op_table_finish_ptr_reg) < 2**OP_TAG_WIDTH) && (!m_axi_arvalid || m_axi_arready)) begin
req_axi_addr_next = req_axi_addr_reg + req_tr_count_reg;
req_ram_addr_next = req_ram_addr_reg + req_tr_count_reg;
req_op_count_next = req_op_count_reg - req_tr_count_reg;
op_table_start_axi_addr = req_axi_addr_reg;
op_table_start_ram_sel = req_ram_sel_reg;
op_table_start_ram_addr = req_ram_addr_reg;
op_table_start_len = req_tr_count_next;
op_table_start_tag = req_tag_reg;
op_table_start_cycle_count = (req_tr_count_next + (req_axi_addr_reg & OFFSET_MASK) - 1) >> AXI_BURST_SIZE;
op_table_start_last = req_op_count_reg == req_tr_count_next;
op_table_start_en = 1'b1;
m_axi_arid_next = op_table_start_ptr_reg[OP_TAG_WIDTH-1:0];
m_axi_araddr_next = req_axi_addr_reg;
m_axi_arlen_next = op_table_start_cycle_count;
m_axi_arvalid_next = 1'b1;
if (req_op_count_next <= AXI_MAX_BURST_SIZE - (req_axi_addr_next & OFFSET_MASK) || AXI_MAX_BURST_SIZE >= 4096) begin
// packet smaller than max burst size
if (((req_axi_addr_next & 12'hfff) + (req_op_count_next & 12'hfff)) >> 12 != 0 || req_op_count_next >> 12 != 0) begin
// crosses 4k boundary
req_tr_count_next = 13'h1000 - req_axi_addr_next[11:0];
end else begin
// does not cross 4k boundary
req_tr_count_next = req_op_count_next;
end
end else begin
// packet larger than max burst size
if (((req_axi_addr_next & 12'hfff) + AXI_MAX_BURST_SIZE) >> 12 != 0) begin
// crosses 4k boundary
req_tr_count_next = 13'h1000 - req_axi_addr_next[11:0];
end else begin
// does not cross 4k boundary
req_tr_count_next = AXI_MAX_BURST_SIZE - (req_axi_addr_next & OFFSET_MASK);
end
end
if (!op_table_start_last) begin
req_state_next = REQ_STATE_START;
end else begin
s_axis_read_desc_ready_next = !op_table_active[op_table_start_ptr_reg[OP_TAG_WIDTH-1:0]] && ($unsigned(op_table_start_ptr_reg - op_table_finish_ptr_reg) < 2**OP_TAG_WIDTH) && enable;
req_state_next = REQ_STATE_IDLE;
end
end else begin
req_state_next = REQ_STATE_START;
end
end
endcase
end
always @* begin
axi_state_next = AXI_STATE_IDLE;
m_axi_rready_next = 1'b0;
ram_sel_next = ram_sel_reg;
addr_next = addr_reg;
addr_delay_next = addr_delay_reg;
op_count_next = op_count_reg;
ram_mask_next = ram_mask_reg;
ram_mask_0_next = ram_mask_0_reg;
ram_mask_1_next = ram_mask_1_reg;
ram_wrap_next = ram_wrap_reg;
cycle_byte_count_next = cycle_byte_count_reg;
start_offset_next = start_offset_reg;
end_offset_next = end_offset_reg;
offset_next = offset_reg;
op_tag_next = op_tag_reg;
op_table_write_complete_en = 1'b0;
op_table_write_complete_ptr = m_axi_rid;
m_axi_rdata_int_next = m_axi_rdata_int_reg;
m_axi_rvalid_int_next = 1'b0;
status_fifo_finish_next = 1'b0;
status_fifo_we_next = 1'b0;
out_done_ack = {RAM_SEG_COUNT{1'b0}};
// Write generation
ram_wr_cmd_sel_int = {RAM_SEG_COUNT{ram_sel_reg}};
if (!ram_wrap_reg) begin
ram_wr_cmd_be_int = ({RAM_SEG_COUNT*RAM_SEG_BE_WIDTH{1'b1}} << start_offset_reg) & ({RAM_SEG_COUNT*RAM_SEG_BE_WIDTH{1'b1}} >> (RAM_SEG_COUNT*RAM_SEG_BE_WIDTH-1-end_offset_reg));
end else begin
ram_wr_cmd_be_int = ({RAM_SEG_COUNT*RAM_SEG_BE_WIDTH{1'b1}} << start_offset_reg) | ({RAM_SEG_COUNT*RAM_SEG_BE_WIDTH{1'b1}} >> (RAM_SEG_COUNT*RAM_SEG_BE_WIDTH-1-end_offset_reg));
end
for (i = 0; i < RAM_SEG_COUNT; i = i + 1) begin
ram_wr_cmd_addr_int[i*RAM_SEG_ADDR_WIDTH +: RAM_SEG_ADDR_WIDTH] = addr_delay_reg[RAM_ADDR_WIDTH-1:RAM_ADDR_WIDTH-RAM_SEG_ADDR_WIDTH];
if (ram_mask_1_reg[i]) begin
ram_wr_cmd_addr_int[i*RAM_SEG_ADDR_WIDTH +: RAM_SEG_ADDR_WIDTH] = addr_delay_reg[RAM_ADDR_WIDTH-1:RAM_ADDR_WIDTH-RAM_SEG_ADDR_WIDTH]+1;
end
end
ram_wr_cmd_data_int = {3{m_axi_rdata_int_reg}} >> (AXI_DATA_WIDTH - offset_reg*AXI_WORD_SIZE);
ram_wr_cmd_valid_int = {RAM_SEG_COUNT{1'b0}};
if (m_axi_rvalid_int_reg) begin
ram_wr_cmd_valid_int = ram_mask_reg;
end
// AXI read response handling
case (axi_state_reg)
AXI_STATE_IDLE: begin
// idle state, wait for read data
m_axi_rready_next = &ram_wr_cmd_ready_int && !status_fifo_half_full_reg;
op_tag_next = m_axi_rid[OP_TAG_WIDTH-1:0];
ram_sel_next = op_table_ram_sel[op_tag_next];
addr_next = op_table_ram_addr[op_tag_next];
op_count_next = op_table_len[op_tag_next];
offset_next = op_table_ram_addr[op_tag_next][RAM_OFFSET_WIDTH-1:0]-(op_table_axi_addr[op_tag_next] & OFFSET_MASK);
if (m_axi_rready && m_axi_rvalid) begin
if (op_count_next > AXI_WORD_WIDTH-(op_table_axi_addr[m_axi_rid[OP_TAG_WIDTH-1:0]] & OFFSET_MASK)) begin
cycle_byte_count_next = AXI_WORD_WIDTH-(op_table_axi_addr[m_axi_rid[OP_TAG_WIDTH-1:0]] & OFFSET_MASK);
end else begin
cycle_byte_count_next = op_count_next;
end
start_offset_next = addr_next;
{ram_wrap_next, end_offset_next} = start_offset_next+cycle_byte_count_next-1;
ram_mask_0_next = {RAM_SEG_COUNT{1'b1}} << (start_offset_next >> $clog2(RAM_SEG_BE_WIDTH));
ram_mask_1_next = {RAM_SEG_COUNT{1'b1}} >> (RAM_SEG_COUNT-1-(end_offset_next >> $clog2(RAM_SEG_BE_WIDTH)));
if (!ram_wrap_next) begin
ram_mask_next = ram_mask_0_next & ram_mask_1_next;
ram_mask_0_next = ram_mask_0_next & ram_mask_1_next;
ram_mask_1_next = 0;
end else begin
ram_mask_next = ram_mask_0_next | ram_mask_1_next;
end
addr_delay_next = addr_next;
addr_next = addr_next + cycle_byte_count_next;
op_count_next = op_count_next - cycle_byte_count_next;
m_axi_rdata_int_next = m_axi_rdata;
m_axi_rvalid_int_next = 1'b1;
status_fifo_finish_next = 1'b0;
status_fifo_we_next = 1'b1;
if (m_axi_rlast) begin
status_fifo_finish_next = 1'b1;
axi_state_next = AXI_STATE_IDLE;
end else begin
axi_state_next = AXI_STATE_WRITE;
end
end else begin
axi_state_next = AXI_STATE_IDLE;
end
end
AXI_STATE_WRITE: begin
// write state - generate write operations
m_axi_rready_next = &ram_wr_cmd_ready_int && !status_fifo_half_full_reg;
if (m_axi_rready && m_axi_rvalid) begin
if (op_count_next > AXI_WORD_WIDTH) begin
cycle_byte_count_next = AXI_WORD_WIDTH;
end else begin
cycle_byte_count_next = op_count_next;
end
start_offset_next = addr_next;
{ram_wrap_next, end_offset_next} = start_offset_next+cycle_byte_count_next-1;
ram_mask_0_next = {RAM_SEG_COUNT{1'b1}} << (start_offset_next >> $clog2(RAM_SEG_BE_WIDTH));
ram_mask_1_next = {RAM_SEG_COUNT{1'b1}} >> (RAM_SEG_COUNT-1-(end_offset_next >> $clog2(RAM_SEG_BE_WIDTH)));
if (!ram_wrap_next) begin
ram_mask_next = ram_mask_0_next & ram_mask_1_next;
ram_mask_0_next = ram_mask_0_next & ram_mask_1_next;
ram_mask_1_next = 0;
end else begin
ram_mask_next = ram_mask_0_next | ram_mask_1_next;
end
addr_delay_next = addr_next;
addr_next = addr_next + cycle_byte_count_next;
op_count_next = op_count_next - cycle_byte_count_next;
m_axi_rdata_int_next = m_axi_rdata;
m_axi_rvalid_int_next = 1'b1;
status_fifo_finish_next = 1'b0;
status_fifo_we_next = 1'b1;
if (m_axi_rlast) begin
status_fifo_finish_next = 1'b1;
axi_state_next = AXI_STATE_IDLE;
end else begin
axi_state_next = AXI_STATE_WRITE;
end
end else begin
axi_state_next = AXI_STATE_WRITE;
end
end
endcase
status_fifo_rd_ptr_next = status_fifo_rd_ptr_reg;
status_fifo_wr_op_tag = op_tag_reg;
status_fifo_wr_mask = ram_mask_reg;
status_fifo_wr_finish = status_fifo_finish_reg;
status_fifo_we = 1'b0;
if (status_fifo_we_reg) begin
status_fifo_wr_op_tag = op_tag_reg;
status_fifo_wr_mask = ram_mask_reg;
status_fifo_wr_finish = status_fifo_finish_reg;
status_fifo_we = 1'b1;
end
status_fifo_rd_op_tag_next = status_fifo_rd_op_tag_reg;
status_fifo_rd_mask_next = status_fifo_rd_mask_reg;
status_fifo_rd_finish_next = status_fifo_rd_finish_reg;
status_fifo_rd_valid_next = status_fifo_rd_valid_reg;
op_table_write_complete_ptr = status_fifo_rd_op_tag_reg;
op_table_write_complete_en = 1'b0;
if (status_fifo_rd_valid_reg && (status_fifo_rd_mask_reg & ~out_done) == 0) begin
// got write completion, pop and return status
status_fifo_rd_valid_next = 1'b0;
out_done_ack = status_fifo_rd_mask_reg;
if (status_fifo_rd_finish_reg) begin
// mark done
op_table_write_complete_ptr = status_fifo_rd_op_tag_reg;
op_table_write_complete_en = 1'b1;
end
end
if (!status_fifo_rd_valid_next && status_fifo_rd_ptr_reg != status_fifo_wr_ptr_reg) begin
// status FIFO not empty
status_fifo_rd_op_tag_next = status_fifo_op_tag[status_fifo_rd_ptr_reg[STATUS_FIFO_ADDR_WIDTH-1:0]];
status_fifo_rd_mask_next = status_fifo_mask[status_fifo_rd_ptr_reg[STATUS_FIFO_ADDR_WIDTH-1:0]];
status_fifo_rd_finish_next = status_fifo_finish[status_fifo_rd_ptr_reg[STATUS_FIFO_ADDR_WIDTH-1:0]];
status_fifo_rd_valid_next = 1'b1;
status_fifo_rd_ptr_next = status_fifo_rd_ptr_reg + 1;
end
// commit operations in-order
op_table_finish_en = 1'b0;
m_axis_read_desc_status_tag_next = op_table_tag[op_table_finish_ptr_reg[OP_TAG_WIDTH-1:0]];
m_axis_read_desc_status_error_next = 0;
m_axis_read_desc_status_valid_next = 1'b0;
if (op_table_active[op_table_finish_ptr_reg[OP_TAG_WIDTH-1:0]] && op_table_write_complete[op_table_finish_ptr_reg[OP_TAG_WIDTH-1:0]] && op_table_finish_ptr_reg != op_table_start_ptr_reg) begin
op_table_finish_en = 1'b1;
if (op_table_last[op_table_finish_ptr_reg[OP_TAG_WIDTH-1:0]]) begin
m_axis_read_desc_status_tag_next = op_table_tag[op_table_finish_ptr_reg[OP_TAG_WIDTH-1:0]];
m_axis_read_desc_status_error_next = 0;
m_axis_read_desc_status_valid_next = 1'b1;
end
end
end
always @(posedge clk) begin
req_state_reg <= req_state_next;
axi_state_reg <= axi_state_next;
req_axi_addr_reg <= req_axi_addr_next;
req_ram_sel_reg <= req_ram_sel_next;
req_ram_addr_reg <= req_ram_addr_next;
req_op_count_reg <= req_op_count_next;
req_tr_count_reg <= req_tr_count_next;
req_tag_reg <= req_tag_next;
ram_sel_reg <= ram_sel_next;
addr_reg <= addr_next;
addr_delay_reg <= addr_delay_next;
op_count_reg <= op_count_next;
ram_mask_reg <= ram_mask_next;
ram_mask_0_reg <= ram_mask_0_next;
ram_mask_1_reg <= ram_mask_1_next;
ram_wrap_reg <= ram_wrap_next;
cycle_byte_count_reg <= cycle_byte_count_next;
start_offset_reg <= start_offset_next;
end_offset_reg <= end_offset_next;
offset_reg <= offset_next;
op_tag_reg <= op_tag_next;
m_axi_rdata_int_reg <= m_axi_rdata_int_next;
m_axi_rvalid_int_reg <= m_axi_rvalid_int_next;
m_axi_arid_reg <= m_axi_arid_next;
m_axi_araddr_reg <= m_axi_araddr_next;
m_axi_arlen_reg <= m_axi_arlen_next;
m_axi_arvalid_reg <= m_axi_arvalid_next;
m_axi_rready_reg <= m_axi_rready_next;
s_axis_read_desc_ready_reg <= s_axis_read_desc_ready_next;
m_axis_read_desc_status_tag_reg <= m_axis_read_desc_status_tag_next;
m_axis_read_desc_status_error_reg <= m_axis_read_desc_status_error_next;
m_axis_read_desc_status_valid_reg <= m_axis_read_desc_status_valid_next;
if (status_fifo_we) begin
status_fifo_op_tag[status_fifo_wr_ptr_reg[STATUS_FIFO_ADDR_WIDTH-1:0]] <= status_fifo_wr_op_tag;
status_fifo_mask[status_fifo_wr_ptr_reg[STATUS_FIFO_ADDR_WIDTH-1:0]] <= status_fifo_wr_mask;
status_fifo_finish[status_fifo_wr_ptr_reg[STATUS_FIFO_ADDR_WIDTH-1:0]] <= status_fifo_wr_finish;
status_fifo_wr_ptr_reg <= status_fifo_wr_ptr_reg + 1;
end
status_fifo_rd_ptr_reg <= status_fifo_rd_ptr_next;
status_fifo_finish_reg <= status_fifo_finish_next;
status_fifo_we_reg <= status_fifo_we_next;
status_fifo_rd_op_tag_reg <= status_fifo_rd_op_tag_next;
status_fifo_rd_mask_reg <= status_fifo_rd_mask_next;
status_fifo_rd_finish_reg <= status_fifo_rd_finish_next;
status_fifo_rd_valid_reg <= status_fifo_rd_valid_next;
status_fifo_half_full_reg <= $unsigned(status_fifo_wr_ptr_reg - status_fifo_rd_ptr_reg) >= 2**(STATUS_FIFO_ADDR_WIDTH-1);
if (op_table_start_en) begin
op_table_start_ptr_reg <= op_table_start_ptr_reg + 1;
op_table_active[op_table_start_ptr_reg[OP_TAG_WIDTH-1:0]] <= 1'b1;
op_table_axi_addr[op_table_start_ptr_reg[OP_TAG_WIDTH-1:0]] <= op_table_start_axi_addr;
op_table_ram_sel[op_table_start_ptr_reg[OP_TAG_WIDTH-1:0]] <= op_table_start_ram_sel;
op_table_ram_addr[op_table_start_ptr_reg[OP_TAG_WIDTH-1:0]] <= op_table_start_ram_addr;
op_table_len[op_table_start_ptr_reg[OP_TAG_WIDTH-1:0]] <= op_table_start_len;
op_table_cycle_count[op_table_start_ptr_reg[OP_TAG_WIDTH-1:0]] <= op_table_start_cycle_count;
op_table_tag[op_table_start_ptr_reg[OP_TAG_WIDTH-1:0]] <= op_table_start_tag;
op_table_last[op_table_start_ptr_reg[OP_TAG_WIDTH-1:0]] <= op_table_start_last;
op_table_write_complete[op_table_start_ptr_reg[OP_TAG_WIDTH-1:0]] <= 1'b0;
end
if (op_table_write_complete_en) begin
op_table_write_complete[op_table_write_complete_ptr] <= 1'b1;
end
if (op_table_finish_en) begin
op_table_finish_ptr_reg <= op_table_finish_ptr_reg + 1;
op_table_active[op_table_finish_ptr_reg[OP_TAG_WIDTH-1:0]] <= 1'b0;
end
if (rst) begin
req_state_reg <= REQ_STATE_IDLE;
axi_state_reg <= AXI_STATE_IDLE;
m_axi_rdata_int_reg <= 1'b0;
m_axi_arvalid_reg <= 1'b0;
m_axi_rready_reg <= 1'b0;
s_axis_read_desc_ready_reg <= 1'b0;
m_axis_read_desc_status_valid_reg <= 1'b0;
status_fifo_wr_ptr_reg <= 0;
status_fifo_rd_ptr_reg <= 0;
status_fifo_we_reg <= 1'b0;
status_fifo_rd_valid_reg <= 1'b0;
op_table_active <= 0;
end
end
// output datapath logic (write data)
generate
genvar n;
for (n = 0; n < RAM_SEG_COUNT; n = n + 1) begin
reg [RAM_SEL_WIDTH-1:0] ram_wr_cmd_sel_reg = {RAM_SEL_WIDTH{1'b0}};
reg [RAM_SEG_BE_WIDTH-1:0] ram_wr_cmd_be_reg = {RAM_SEG_BE_WIDTH{1'b0}};
reg [RAM_SEG_ADDR_WIDTH-1:0] ram_wr_cmd_addr_reg = {RAM_SEG_ADDR_WIDTH{1'b0}};
reg [RAM_SEG_DATA_WIDTH-1:0] ram_wr_cmd_data_reg = {RAM_SEG_DATA_WIDTH{1'b0}};
reg ram_wr_cmd_valid_reg = 1'b0;
reg [OUTPUT_FIFO_ADDR_WIDTH-1:0] out_fifo_wr_ptr_reg = 0;
reg [OUTPUT_FIFO_ADDR_WIDTH-1:0] out_fifo_rd_ptr_reg = 0;
reg out_fifo_half_full_reg = 1'b0;
wire out_fifo_full = out_fifo_wr_ptr_reg == (out_fifo_rd_ptr_reg ^ {1'b1, {OUTPUT_FIFO_ADDR_WIDTH{1'b0}}});
wire out_fifo_empty = out_fifo_wr_ptr_reg == out_fifo_rd_ptr_reg;
(* ram_style = "distributed", ramstyle = "no_rw_check, mlab" *)
reg [RAM_SEL_WIDTH-1:0] out_fifo_wr_cmd_sel[2**OUTPUT_FIFO_ADDR_WIDTH-1:0];
(* ram_style = "distributed", ramstyle = "no_rw_check, mlab" *)
reg [RAM_SEG_BE_WIDTH-1:0] out_fifo_wr_cmd_be[2**OUTPUT_FIFO_ADDR_WIDTH-1:0];
(* ram_style = "distributed", ramstyle = "no_rw_check, mlab" *)
reg [RAM_SEG_ADDR_WIDTH-1:0] out_fifo_wr_cmd_addr[2**OUTPUT_FIFO_ADDR_WIDTH-1:0];
(* ram_style = "distributed", ramstyle = "no_rw_check, mlab" *)
reg [RAM_SEG_DATA_WIDTH-1:0] out_fifo_wr_cmd_data[2**OUTPUT_FIFO_ADDR_WIDTH-1:0];
reg [OUTPUT_FIFO_ADDR_WIDTH+1-1:0] done_count_reg = 0;
reg done_reg = 1'b0;
assign ram_wr_cmd_ready_int[n +: 1] = !out_fifo_half_full_reg;
assign ram_wr_cmd_sel[n*RAM_SEL_WIDTH +: RAM_SEL_WIDTH] = ram_wr_cmd_sel_reg;
assign ram_wr_cmd_be[n*RAM_SEG_BE_WIDTH +: RAM_SEG_BE_WIDTH] = ram_wr_cmd_be_reg;
assign ram_wr_cmd_addr[n*RAM_SEG_ADDR_WIDTH +: RAM_SEG_ADDR_WIDTH] = ram_wr_cmd_addr_reg;
assign ram_wr_cmd_data[n*RAM_SEG_DATA_WIDTH +: RAM_SEG_DATA_WIDTH] = ram_wr_cmd_data_reg;
assign ram_wr_cmd_valid[n +: 1] = ram_wr_cmd_valid_reg;
assign out_done[n] = done_reg;
always @(posedge clk) begin
ram_wr_cmd_valid_reg <= ram_wr_cmd_valid_reg && !ram_wr_cmd_ready[n +: 1];
out_fifo_half_full_reg <= $unsigned(out_fifo_wr_ptr_reg - out_fifo_rd_ptr_reg) >= 2**(OUTPUT_FIFO_ADDR_WIDTH-1);
if (!out_fifo_full && ram_wr_cmd_valid_int[n +: 1]) begin
out_fifo_wr_cmd_sel[out_fifo_wr_ptr_reg[OUTPUT_FIFO_ADDR_WIDTH-1:0]] <= ram_wr_cmd_sel_int[n*RAM_SEL_WIDTH +: RAM_SEL_WIDTH];
out_fifo_wr_cmd_be[out_fifo_wr_ptr_reg[OUTPUT_FIFO_ADDR_WIDTH-1:0]] <= ram_wr_cmd_be_int[n*RAM_SEG_BE_WIDTH +: RAM_SEG_BE_WIDTH];
out_fifo_wr_cmd_addr[out_fifo_wr_ptr_reg[OUTPUT_FIFO_ADDR_WIDTH-1:0]] <= ram_wr_cmd_addr_int[n*RAM_SEG_ADDR_WIDTH +: RAM_SEG_ADDR_WIDTH];
out_fifo_wr_cmd_data[out_fifo_wr_ptr_reg[OUTPUT_FIFO_ADDR_WIDTH-1:0]] <= ram_wr_cmd_data_int[n*RAM_SEG_DATA_WIDTH +: RAM_SEG_DATA_WIDTH];
out_fifo_wr_ptr_reg <= out_fifo_wr_ptr_reg + 1;
end
if (!out_fifo_empty && (!ram_wr_cmd_valid_reg || ram_wr_cmd_ready[n +: 1])) begin
ram_wr_cmd_sel_reg <= out_fifo_wr_cmd_sel[out_fifo_rd_ptr_reg[OUTPUT_FIFO_ADDR_WIDTH-1:0]];
ram_wr_cmd_be_reg <= out_fifo_wr_cmd_be[out_fifo_rd_ptr_reg[OUTPUT_FIFO_ADDR_WIDTH-1:0]];
ram_wr_cmd_addr_reg <= out_fifo_wr_cmd_addr[out_fifo_rd_ptr_reg[OUTPUT_FIFO_ADDR_WIDTH-1:0]];
ram_wr_cmd_data_reg <= out_fifo_wr_cmd_data[out_fifo_rd_ptr_reg[OUTPUT_FIFO_ADDR_WIDTH-1:0]];
ram_wr_cmd_valid_reg <= 1'b1;
out_fifo_rd_ptr_reg <= out_fifo_rd_ptr_reg + 1;
end
if (done_count_reg < 2**OUTPUT_FIFO_ADDR_WIDTH && ram_wr_done[n] && !out_done_ack[n]) begin
done_count_reg <= done_count_reg + 1;
done_reg <= 1;
end else if (done_count_reg > 0 && !ram_wr_done[n] && out_done_ack[n]) begin
done_count_reg <= done_count_reg - 1;
done_reg <= done_count_reg > 1;
end
if (rst) begin
out_fifo_wr_ptr_reg <= 0;
out_fifo_rd_ptr_reg <= 0;
ram_wr_cmd_valid_reg <= 1'b0;
done_count_reg <= 0;
done_reg <= 1'b0;
end
end
end
endgenerate
endmodule
`resetall
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