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dgisselq |
////////////////////////////////////////////////////////////////////////////////
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//
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// Filename: faxi_slave.v (Formal properties of an AXI slave)
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//
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// Project: Pipelined Wishbone to AXI converter
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//
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// Purpose:
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//
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// Creator: Dan Gisselquist, Ph.D.
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// Gisselquist Technology, LLC
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//
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////////////////////////////////////////////////////////////////////////////////
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//
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// Copyright (C) 2017, Gisselquist Technology, LLC
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//
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// This program is free software (firmware): you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as published
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// by the Free Software Foundation, either version 3 of the License, or (at
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// your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with this program. (It's in the $(ROOT)/doc directory, run make with no
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// target there if the PDF file isn't present.) If not, see
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// <http://www.gnu.org/licenses/> for a copy.
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//
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// License: GPL, v3, as defined and found on www.gnu.org,
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// http://www.gnu.org/licenses/gpl.html
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//
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//
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////////////////////////////////////////////////////////////////////////////////
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//
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//
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`default_nettype none
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//
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module faxi_slave #(
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parameter C_AXI_ID_WIDTH = 3, // The AXI id width used for R&W
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// This is an int between 1-16
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parameter C_AXI_DATA_WIDTH = 128,// Width of the AXI R&W data
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parameter C_AXI_ADDR_WIDTH = 28, // AXI Address width (log wordsize)
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localparam DW = C_AXI_DATA_WIDTH,
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localparam AW = C_AXI_ADDR_WIDTH,
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parameter [(C_AXI_ID_WIDTH-1):0] F_AXI_MAXSTALL = 3,
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parameter [(C_AXI_ID_WIDTH-1):0] F_AXI_MAXDELAY = 3,
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parameter [0:0] F_STRICT_ORDER = 0, // Reorder, or not? 0 -> Reorder
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parameter [0:0] F_CONSECUTIVE_IDS= 0, // 0=ID's must be consecutive
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parameter [0:0] F_OPT_BURSTS = 1'b1, // Check burst lengths
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parameter [0:0] F_CHECK_IDS = 1'b1 // Check ID's upon issue&return
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) (
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input i_clk, // System clock
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input i_axi_reset_n,
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// AXI write address channel signals
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input i_axi_awready, // Slave is ready to accept
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input wire [C_AXI_ID_WIDTH-1:0] i_axi_awid, // Write ID
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input wire [AW-1:0] i_axi_awaddr, // Write address
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input wire [7:0] i_axi_awlen, // Write Burst Length
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input wire [2:0] i_axi_awsize, // Write Burst size
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input wire [1:0] i_axi_awburst, // Write Burst type
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input wire [0:0] i_axi_awlock, // Write lock type
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input wire [3:0] i_axi_awcache, // Write Cache type
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input wire [2:0] i_axi_awprot, // Write Protection type
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input wire [3:0] i_axi_awqos, // Write Quality of Svc
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input wire i_axi_awvalid, // Write address valid
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// AXI write data channel signals
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input wire i_axi_wready, // Write data ready
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input wire [DW-1:0] i_axi_wdata, // Write data
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input wire [DW/8-1:0] i_axi_wstrb, // Write strobes
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input wire i_axi_wlast, // Last write transaction
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input wire i_axi_wvalid, // Write valid
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// AXI write response channel signals
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input wire [C_AXI_ID_WIDTH-1:0] i_axi_bid, // Response ID
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input wire [1:0] i_axi_bresp, // Write response
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input wire i_axi_bvalid, // Write reponse valid
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input wire i_axi_bready, // Response ready
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// AXI read address channel signals
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input wire i_axi_arready, // Read address ready
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input wire [C_AXI_ID_WIDTH-1:0] i_axi_arid, // Read ID
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input wire [AW-1:0] i_axi_araddr, // Read address
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input wire [7:0] i_axi_arlen, // Read Burst Length
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input wire [2:0] i_axi_arsize, // Read Burst size
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input wire [1:0] i_axi_arburst, // Read Burst type
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input wire [0:0] i_axi_arlock, // Read lock type
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input wire [3:0] i_axi_arcache, // Read Cache type
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input wire [2:0] i_axi_arprot, // Read Protection type
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input wire [3:0] i_axi_arqos, // Read Protection type
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input wire i_axi_arvalid, // Read address valid
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// AXI read data channel signals
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input wire [C_AXI_ID_WIDTH-1:0] i_axi_rid, // Response ID
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input wire [1:0] i_axi_rresp, // Read response
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input wire i_axi_rvalid, // Read reponse valid
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input wire [DW-1:0] i_axi_rdata, // Read data
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input wire i_axi_rlast, // Read last
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input wire i_axi_rready, // Read Response ready
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//
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output reg [(C_AXI_ID_WIDTH-1):0] f_axi_rd_outstanding,
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output reg [(C_AXI_ID_WIDTH-1):0] f_axi_wr_outstanding,
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output reg [(C_AXI_ID_WIDTH-1):0] f_axi_awr_outstanding,
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output reg [((1<<C_AXI_ID_WIDTH)-1):0] f_axi_rd_id_outstanding,
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output reg [((1<<C_AXI_ID_WIDTH)-1):0] f_axi_awr_id_outstanding,
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output reg [((1<<C_AXI_ID_WIDTH)-1):0] f_axi_wr_id_outstanding
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);
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reg [((1<<C_AXI_ID_WIDTH)-1):0] f_axi_wr_id_complete;
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//*****************************************************************************
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// Parameter declarations
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//*****************************************************************************
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localparam LG_AXI_DW = ( C_AXI_DATA_WIDTH == 8) ? 3
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: ((C_AXI_DATA_WIDTH == 16) ? 4
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: ((C_AXI_DATA_WIDTH == 32) ? 5
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: ((C_AXI_DATA_WIDTH == 64) ? 6
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: ((C_AXI_DATA_WIDTH == 128) ? 7
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: 8))));
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localparam LG_WB_DW = ( DW == 8) ? 3
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: ((DW == 16) ? 4
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: ((DW == 32) ? 5
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: ((DW == 64) ? 6
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: ((DW == 128) ? 7
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: 8))));
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localparam LGFIFOLN = C_AXI_ID_WIDTH;
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localparam FIFOLN = (1<<LGFIFOLN);
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//*****************************************************************************
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// Internal register and wire declarations
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//*****************************************************************************
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// Things we're not changing ...
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always @(*)
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begin
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assume(i_axi_awlen == 8'h0); // Burst length is one
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assume(i_axi_awsize == 3'b101); // maximum bytes per burst is 32
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assume(i_axi_awburst == 2'b01); // Incrementing address (ignored)
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assume(i_axi_arburst == 2'b01); // Incrementing address (ignored)
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assume(i_axi_awlock == 1'b0); // Normal signaling
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assume(i_axi_arlock == 1'b0); // Normal signaling
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assume(i_axi_awcache == 4'h2); // Normal: no cache, no buffer
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assume(i_axi_arcache == 4'h2); // Normal: no cache, no buffer
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assume(i_axi_awprot == 3'b010);// Unpriviledged, unsecure, data access
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assume(i_axi_arprot == 3'b010);// Unpriviledged, unsecure, data access
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assume(i_axi_awqos == 4'h0); // Lowest quality of service (unused)
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assume(i_axi_arqos == 4'h0); // Lowest quality of service (unused)
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end
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// wire w_fifo_full;
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wire axi_rd_ack, axi_wr_ack, axi_ard_req, axi_awr_req, axi_wr_req,
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axi_rd_err, axi_wr_err;
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//
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assign axi_ard_req = (i_axi_arvalid)&&(i_axi_arready);
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assign axi_awr_req = (i_axi_awvalid)&&(i_axi_awready);
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assign axi_wr_req = (i_axi_wvalid )&&(i_axi_wready);
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//
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assign axi_rd_ack = (i_axi_rvalid)&&(i_axi_rready);
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assign axi_wr_ack = (i_axi_bvalid)&&(i_axi_bready);
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assign axi_rd_err = (axi_rd_ack)&&(i_axi_rresp[1]);
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assign axi_wr_err = (axi_wr_ack)&&(i_axi_bresp[1]);
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//
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// Setup
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//
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reg f_past_valid;
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integer k;
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initial f_past_valid = 1'b0;
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always @(posedge i_clk)
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f_past_valid <= 1'b1;
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always @(*)
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if (!f_past_valid)
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assume(!i_axi_reset_n);
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//
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// All signals must be synchronous with the clock
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//
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always @($global_clock)
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if (f_past_valid) begin
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// Assume our inputs will only change on the positive edge
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// of the clock
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if (!$rose(i_clk))
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begin
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// AXI inputs
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assert($stable(i_axi_awready));
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assert($stable(i_axi_wready));
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//
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assert($stable(i_axi_bid));
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assert($stable(i_axi_bresp));
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assert($stable(i_axi_bvalid));
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assert($stable(i_axi_arready));
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//
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assert($stable(i_axi_rid));
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assert($stable(i_axi_rresp));
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assert($stable(i_axi_rvalid));
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assert($stable(i_axi_rdata));
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assert($stable(i_axi_rlast));
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//
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// AXI outputs
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//
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assume($stable(i_axi_awvalid));
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assume($stable(i_axi_awid));
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assume($stable(i_axi_awlen));
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assume($stable(i_axi_awsize));
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assume($stable(i_axi_awlock));
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assume($stable(i_axi_awcache));
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assume($stable(i_axi_awprot));
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assume($stable(i_axi_awqos));
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//
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assume($stable(i_axi_wvalid));
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assume($stable(i_axi_wdata));
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assume($stable(i_axi_wstrb));
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assume($stable(i_axi_wlast));
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//
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assume($stable(i_axi_arvalid));
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assume($stable(i_axi_arid));
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assume($stable(i_axi_arlen));
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assume($stable(i_axi_arsize));
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assume($stable(i_axi_arburst));
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assume($stable(i_axi_arlock));
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assume($stable(i_axi_arprot));
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assume($stable(i_axi_arqos));
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//
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assume($stable(i_axi_bready));
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//
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assume($stable(i_axi_rready));
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//
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// Formal outputs
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//
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assume($stable(f_axi_rd_outstanding));
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assume($stable(f_axi_wr_outstanding));
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assume($stable(f_axi_awr_outstanding));
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end
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end
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////////////////////////////////////////////////////
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//
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//
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// Reset properties
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//
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//
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////////////////////////////////////////////////////
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always @(posedge i_clk)
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if ((f_past_valid)&&(!$past(i_axi_reset_n)))
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begin
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assume(!i_axi_arvalid);
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assume(!i_axi_awvalid);
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assume(!i_axi_wvalid);
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assert(!i_axi_bvalid);
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assert(!i_axi_rvalid);
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end
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////////////////////////////////////////////////////
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//
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//
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// Stability assumptions, AXI inputs/responses
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//
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//
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////////////////////////////////////////////////////
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// Assume any response from the bus will not change prior to that
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// response being accepted
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always @(posedge i_clk)
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if (f_past_valid)
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begin
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if ((f_past_valid)&&($past(i_axi_rvalid))&&(!$past(i_axi_rready)))
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begin
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assert(i_axi_rid == $past(i_axi_rid));
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assert(i_axi_rresp == $past(i_axi_rresp));
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assert(i_axi_rdata == $past(i_axi_rdata));
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assert(i_axi_rlast == $past(i_axi_rlast));
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end
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if ((f_past_valid)&&($past(i_axi_bvalid))&&(!$past(i_axi_bready)))
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begin
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assert(i_axi_bid == $past(i_axi_bid));
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assert(i_axi_bresp == $past(i_axi_bresp));
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end
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end
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// Nothing should be returning a result on the first clock
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initial assert(!i_axi_bvalid);
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initial assert(!i_axi_rvalid);
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//
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initial assume(!i_axi_arvalid);
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initial assume(!i_axi_awvalid);
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initial assume(!i_axi_wvalid);
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//////////////////////////////////////////////
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//
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//
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// Stability assumptions, AXI outputs/requests
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//
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//
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//////////////////////////////////////////////
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// Read address chanel
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always @(posedge i_clk)
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|
|
if ((f_past_valid)&&($past(i_axi_arvalid))&&(!$past(i_axi_arready)))
|
| 308 |
|
|
begin
|
| 309 |
|
|
assume(i_axi_arvalid);
|
| 310 |
|
|
assume($stable(i_axi_arid));
|
| 311 |
|
|
assume($stable(i_axi_araddr));
|
| 312 |
|
|
assume($stable(i_axi_arlen));
|
| 313 |
|
|
assume($stable(i_axi_arsize));
|
| 314 |
|
|
assume($stable(i_axi_arburst));
|
| 315 |
|
|
assume($stable(i_axi_arlock));
|
| 316 |
|
|
assume($stable(i_axi_arcache));
|
| 317 |
|
|
assume($stable(i_axi_arprot));
|
| 318 |
|
|
assume($stable(i_axi_arqos));
|
| 319 |
|
|
assume($stable(i_axi_arvalid));
|
| 320 |
|
|
end
|
| 321 |
|
|
|
| 322 |
|
|
// If valid, but not ready, on any channel is true, nothing changes
|
| 323 |
|
|
// until valid && ready
|
| 324 |
|
|
always @(posedge i_clk)
|
| 325 |
|
|
if ((f_past_valid)&&($past(i_axi_awvalid))&&(!$past(i_axi_awready)))
|
| 326 |
|
|
begin
|
| 327 |
|
|
assume($stable(i_axi_awid));
|
| 328 |
|
|
assume($stable(i_axi_awaddr));
|
| 329 |
|
|
assume($stable(i_axi_awlen));
|
| 330 |
|
|
assume($stable(i_axi_awsize));
|
| 331 |
|
|
assume($stable(i_axi_awburst));
|
| 332 |
|
|
assume($stable(i_axi_awlock));
|
| 333 |
|
|
assume($stable(i_axi_awcache));
|
| 334 |
|
|
assume($stable(i_axi_awprot));
|
| 335 |
|
|
assume($stable(i_axi_awqos));
|
| 336 |
|
|
assume($stable(i_axi_awvalid));
|
| 337 |
|
|
end
|
| 338 |
|
|
|
| 339 |
|
|
always @(posedge i_clk)
|
| 340 |
|
|
if ((f_past_valid)&&($past(i_axi_wvalid))&&(!$past(i_axi_wready)))
|
| 341 |
|
|
begin
|
| 342 |
|
|
// AXI write data channel signals
|
| 343 |
|
|
assume($stable(i_axi_wdata));
|
| 344 |
|
|
assume($stable(i_axi_wstrb));
|
| 345 |
|
|
assume($stable(i_axi_wlast));
|
| 346 |
|
|
assume($stable(i_axi_wvalid));
|
| 347 |
|
|
end
|
| 348 |
|
|
|
| 349 |
|
|
//
|
| 350 |
|
|
//
|
| 351 |
|
|
|
| 352 |
|
|
///////////////////////////////////////////////////////////////////
|
| 353 |
|
|
//
|
| 354 |
|
|
//
|
| 355 |
|
|
// Insist upon a maximum delay before a request is accepted
|
| 356 |
|
|
//
|
| 357 |
|
|
//
|
| 358 |
|
|
///////////////////////////////////////////////////////////////////
|
| 359 |
|
|
|
| 360 |
|
|
//
|
| 361 |
|
|
// AXI write address channel
|
| 362 |
|
|
//
|
| 363 |
|
|
//
|
| 364 |
|
|
reg [(C_AXI_ID_WIDTH):0] f_axi_awstall;
|
| 365 |
|
|
initial f_axi_awstall = 0;
|
| 366 |
|
|
always @(posedge i_clk)
|
| 367 |
|
|
if ((!i_axi_reset_n)||(!i_axi_awvalid)||(i_axi_awready))
|
| 368 |
|
|
f_axi_awstall <= 0;
|
| 369 |
|
|
else
|
| 370 |
|
|
f_axi_awstall <= f_axi_awstall + 1'b1;
|
| 371 |
|
|
always @(*)
|
| 372 |
|
|
assert((F_AXI_MAXSTALL==0)||(f_axi_awstall < F_AXI_MAXSTALL));
|
| 373 |
|
|
|
| 374 |
|
|
//
|
| 375 |
|
|
// AXI write data channel
|
| 376 |
|
|
//
|
| 377 |
|
|
//
|
| 378 |
|
|
// AXI explicitly allows write bursts with zero strobes. This is part
|
| 379 |
|
|
// of how a transaction is aborted (if at all).
|
| 380 |
|
|
//always @(*) if (i_axi_wvalid) assume(|i_axi_wstrb);
|
| 381 |
|
|
|
| 382 |
|
|
reg [(C_AXI_ID_WIDTH):0] f_axi_wstall;
|
| 383 |
|
|
initial f_axi_wstall = 0;
|
| 384 |
|
|
always @(posedge i_clk)
|
| 385 |
|
|
if ((!i_axi_reset_n)||(!i_axi_wvalid)||(i_axi_wready))
|
| 386 |
|
|
f_axi_wstall <= 0;
|
| 387 |
|
|
else
|
| 388 |
|
|
f_axi_wstall <= f_axi_wstall + 1'b1;
|
| 389 |
|
|
always @(*)
|
| 390 |
|
|
assert((F_AXI_MAXSTALL==0)||(f_axi_wstall < F_AXI_MAXSTALL));
|
| 391 |
|
|
|
| 392 |
|
|
|
| 393 |
|
|
//
|
| 394 |
|
|
// AXI read address channel
|
| 395 |
|
|
//
|
| 396 |
|
|
//
|
| 397 |
|
|
reg [(C_AXI_ID_WIDTH):0] f_axi_arstall;
|
| 398 |
|
|
initial f_axi_arstall = 0;
|
| 399 |
|
|
always @(posedge i_clk)
|
| 400 |
|
|
if ((!i_axi_reset_n)||(!i_axi_arvalid)||(i_axi_arready))
|
| 401 |
|
|
f_axi_arstall <= 0;
|
| 402 |
|
|
else
|
| 403 |
|
|
f_axi_arstall <= f_axi_arstall + 1'b1;
|
| 404 |
|
|
always @(*)
|
| 405 |
|
|
assert((F_AXI_MAXSTALL==0)||(f_axi_arstall < F_AXI_MAXSTALL));
|
| 406 |
|
|
|
| 407 |
|
|
|
| 408 |
|
|
////////////////////////////////////////////////////////////////////////
|
| 409 |
|
|
//
|
| 410 |
|
|
//
|
| 411 |
|
|
// Count outstanding transactions. With these measures, we count
|
| 412 |
|
|
// once per any burst.
|
| 413 |
|
|
//
|
| 414 |
|
|
//
|
| 415 |
|
|
////////////////////////////////////////////////////////////////////////
|
| 416 |
|
|
initial f_axi_awr_outstanding = 0;
|
| 417 |
|
|
always @(posedge i_clk)
|
| 418 |
|
|
if (!i_axi_reset_n)
|
| 419 |
|
|
f_axi_awr_outstanding <= 0;
|
| 420 |
|
|
else case({ (axi_awr_req), (axi_wr_ack) })
|
| 421 |
|
|
2'b10: f_axi_awr_outstanding <= f_axi_awr_outstanding + 1'b1;
|
| 422 |
|
|
2'b01: f_axi_awr_outstanding <= f_axi_awr_outstanding - 1'b1;
|
| 423 |
|
|
default: begin end
|
| 424 |
|
|
endcase
|
| 425 |
|
|
|
| 426 |
|
|
initial f_axi_wr_outstanding = 0;
|
| 427 |
|
|
always @(posedge i_clk)
|
| 428 |
|
|
if (!i_axi_reset_n)
|
| 429 |
|
|
f_axi_wr_outstanding <= 0;
|
| 430 |
|
|
else case({ (axi_wr_req)&&(i_axi_wlast), (axi_wr_ack) })
|
| 431 |
|
|
2'b01: f_axi_wr_outstanding <= f_axi_wr_outstanding - 1'b1;
|
| 432 |
|
|
2'b10: f_axi_wr_outstanding <= f_axi_wr_outstanding + 1'b1;
|
| 433 |
|
|
endcase
|
| 434 |
|
|
|
| 435 |
|
|
initial f_axi_rd_outstanding = 0;
|
| 436 |
|
|
always @(posedge i_clk)
|
| 437 |
|
|
if (!i_axi_reset_n)
|
| 438 |
|
|
f_axi_rd_outstanding <= 0;
|
| 439 |
|
|
else case({ (axi_ard_req), (axi_rd_ack)&&(i_axi_rlast) })
|
| 440 |
|
|
2'b01: f_axi_rd_outstanding <= f_axi_rd_outstanding - 1'b1;
|
| 441 |
|
|
2'b10: f_axi_rd_outstanding <= f_axi_rd_outstanding + 1'b1;
|
| 442 |
|
|
endcase
|
| 443 |
|
|
|
| 444 |
|
|
// Do not let the number of outstanding requests overflow
|
| 445 |
|
|
always @(posedge i_clk)
|
| 446 |
|
|
assume(f_axi_wr_outstanding < {(C_AXI_ID_WIDTH){1'b1}});
|
| 447 |
|
|
always @(posedge i_clk)
|
| 448 |
|
|
assume(f_axi_awr_outstanding < {(C_AXI_ID_WIDTH){1'b1}});
|
| 449 |
|
|
always @(posedge i_clk)
|
| 450 |
|
|
assume(f_axi_rd_outstanding < {(C_AXI_ID_WIDTH){1'b1}});
|
| 451 |
|
|
|
| 452 |
|
|
////////////////////////////////////////////////////////////////////////
|
| 453 |
|
|
//
|
| 454 |
|
|
//
|
| 455 |
|
|
// Insist that all responses are returned in less than a maximum delay
|
| 456 |
|
|
// In this case, we count responses within a burst, rather than entire
|
| 457 |
|
|
// bursts.
|
| 458 |
|
|
//
|
| 459 |
|
|
//
|
| 460 |
|
|
////////////////////////////////////////////////////////////////////////
|
| 461 |
|
|
|
| 462 |
|
|
reg [(C_AXI_ID_WIDTH):0] f_axi_wr_ack_delay,
|
| 463 |
|
|
f_axi_awr_ack_delay,
|
| 464 |
|
|
f_axi_rd_ack_delay;
|
| 465 |
|
|
|
| 466 |
|
|
initial f_axi_rd_ack_delay = 0;
|
| 467 |
|
|
always @(posedge i_clk)
|
| 468 |
|
|
if ((!i_axi_reset_n)||(axi_rd_ack))
|
| 469 |
|
|
f_axi_rd_ack_delay <= 0;
|
| 470 |
|
|
else if (f_axi_rd_outstanding > 0)
|
| 471 |
|
|
f_axi_rd_ack_delay <= f_axi_rd_ack_delay + 1'b1;
|
| 472 |
|
|
|
| 473 |
|
|
initial f_axi_wr_ack_delay = 0;
|
| 474 |
|
|
always @(posedge i_clk)
|
| 475 |
|
|
if ((!i_axi_reset_n)||(axi_wr_ack))
|
| 476 |
|
|
f_axi_wr_ack_delay <= 0;
|
| 477 |
|
|
else if (f_axi_wr_outstanding > 0)
|
| 478 |
|
|
f_axi_wr_ack_delay <= f_axi_wr_ack_delay + 1'b1;
|
| 479 |
|
|
|
| 480 |
|
|
initial f_axi_awr_ack_delay = 0;
|
| 481 |
|
|
always @(posedge i_clk)
|
| 482 |
|
|
if ((!i_axi_reset_n)||(axi_wr_ack))
|
| 483 |
|
|
f_axi_awr_ack_delay <= 0;
|
| 484 |
|
|
else if (f_axi_awr_outstanding > 0)
|
| 485 |
|
|
f_axi_awr_ack_delay <= f_axi_awr_ack_delay + 1'b1;
|
| 486 |
|
|
|
| 487 |
|
|
always @(posedge i_clk)
|
| 488 |
|
|
assert((F_AXI_MAXDELAY==0)||(f_axi_rd_ack_delay < F_AXI_MAXDELAY));
|
| 489 |
|
|
|
| 490 |
|
|
always @(posedge i_clk)
|
| 491 |
|
|
assert((F_AXI_MAXDELAY==0)||(f_axi_wr_ack_delay < F_AXI_MAXDELAY));
|
| 492 |
|
|
|
| 493 |
|
|
always @(posedge i_clk)
|
| 494 |
|
|
assert((F_AXI_MAXDELAY==0)||(f_axi_awr_ack_delay < F_AXI_MAXDELAY));
|
| 495 |
|
|
|
| 496 |
|
|
////////////////////////////////////////////////////////////////////////
|
| 497 |
|
|
//
|
| 498 |
|
|
//
|
| 499 |
|
|
// Assume all acknowledgements must follow requests
|
| 500 |
|
|
//
|
| 501 |
|
|
// The outstanding count is a count of bursts, but the acknowledgements
|
| 502 |
|
|
// we are looking for are individual. Hence, there should be no
|
| 503 |
|
|
// individual acknowledgements coming back if there's no outstanding
|
| 504 |
|
|
// burst.
|
| 505 |
|
|
//
|
| 506 |
|
|
//
|
| 507 |
|
|
////////////////////////////////////////////////////////////////////////
|
| 508 |
|
|
|
| 509 |
|
|
//
|
| 510 |
|
|
// AXI write response channel
|
| 511 |
|
|
//
|
| 512 |
|
|
always @(posedge i_clk)
|
| 513 |
|
|
if ((!axi_awr_req)&&(axi_wr_ack))
|
| 514 |
|
|
assert(f_axi_awr_outstanding > 0);
|
| 515 |
|
|
always @(posedge i_clk)
|
| 516 |
|
|
if ((!axi_wr_req)&&(axi_wr_ack))
|
| 517 |
|
|
assert(f_axi_wr_outstanding > 0);
|
| 518 |
|
|
|
| 519 |
|
|
//
|
| 520 |
|
|
// AXI read data channel signals
|
| 521 |
|
|
//
|
| 522 |
|
|
initial f_axi_rd_outstanding = 0;
|
| 523 |
|
|
always @(posedge i_clk)
|
| 524 |
|
|
if ((!axi_ard_req)&&(axi_rd_ack))
|
| 525 |
|
|
assert(f_axi_rd_outstanding > 0);
|
| 526 |
|
|
|
| 527 |
|
|
///////////////////////////////////////////////////////////////////
|
| 528 |
|
|
//
|
| 529 |
|
|
//
|
| 530 |
|
|
// Manage the ID buffer. Basic rules apply such as you can't
|
| 531 |
|
|
// make a request of an already requested ID # before that ID
|
| 532 |
|
|
// is returned, etc.
|
| 533 |
|
|
//
|
| 534 |
|
|
// Elements in this buffer reference transactions--possibly burst
|
| 535 |
|
|
// transactions and not necessarily the individual values.
|
| 536 |
|
|
//
|
| 537 |
|
|
//
|
| 538 |
|
|
///////////////////////////////////////////////////////////////////
|
| 539 |
|
|
// Now, let's look into that FIFO. Without it, we know nothing about
|
| 540 |
|
|
// the ID's
|
| 541 |
|
|
|
| 542 |
|
|
initial f_axi_rd_id_outstanding = 0;
|
| 543 |
|
|
initial f_axi_wr_id_outstanding = 0;
|
| 544 |
|
|
initial f_axi_awr_id_outstanding = 0;
|
| 545 |
|
|
initial f_axi_wr_id_complete = 0;
|
| 546 |
|
|
always @(posedge i_clk)
|
| 547 |
|
|
if (!i_axi_reset_n)
|
| 548 |
|
|
begin
|
| 549 |
|
|
f_axi_rd_id_outstanding <= 0;
|
| 550 |
|
|
f_axi_wr_id_outstanding <= 0;
|
| 551 |
|
|
f_axi_wr_id_complete <= 0;
|
| 552 |
|
|
f_axi_awr_id_outstanding <= 0;
|
| 553 |
|
|
end else begin
|
| 554 |
|
|
// When issuing a write
|
| 555 |
|
|
if (axi_awr_req)
|
| 556 |
|
|
begin
|
| 557 |
|
|
if ((F_CONSECUTIVE_IDS)&&(F_CHECK_IDS))
|
| 558 |
|
|
assume(f_axi_awr_id_outstanding[i_axi_awid+1'b1] == 1'b0);
|
| 559 |
|
|
assume((!F_CHECK_IDS)
|
| 560 |
|
|
||(f_axi_awr_id_outstanding[i_axi_awid] == 1'b0));
|
| 561 |
|
|
assume((!F_CHECK_IDS)
|
| 562 |
|
|
||(f_axi_wr_id_complete[i_axi_awid] == 1'b0));
|
| 563 |
|
|
f_axi_awr_id_outstanding[i_axi_awid] <= 1'b1;
|
| 564 |
|
|
f_axi_wr_id_complete[i_axi_awid] <= 1'b0;
|
| 565 |
|
|
end
|
| 566 |
|
|
|
| 567 |
|
|
if (axi_wr_req)
|
| 568 |
|
|
begin
|
| 569 |
|
|
if ((F_CONSECUTIVE_IDS)&&(F_CHECK_IDS))
|
| 570 |
|
|
assume(f_axi_wr_id_outstanding[i_axi_awid+1'b1] == 1'b0);
|
| 571 |
|
|
assume((!F_CHECK_IDS)
|
| 572 |
|
|
||(f_axi_wr_id_outstanding[i_axi_awid] == 1'b0));
|
| 573 |
|
|
f_axi_wr_id_outstanding[i_axi_awid] <= 1'b1;
|
| 574 |
|
|
if (i_axi_wlast)
|
| 575 |
|
|
begin
|
| 576 |
|
|
assert(f_axi_wr_id_complete[i_axi_awid] == 1'b0);
|
| 577 |
|
|
f_axi_wr_id_complete[i_axi_awid] <= 1'b1;
|
| 578 |
|
|
end
|
| 579 |
|
|
end
|
| 580 |
|
|
|
| 581 |
|
|
// When issuing a read
|
| 582 |
|
|
if (axi_ard_req)
|
| 583 |
|
|
begin
|
| 584 |
|
|
if ((F_CONSECUTIVE_IDS)&&(F_CHECK_IDS))
|
| 585 |
|
|
assume(f_axi_rd_id_outstanding[i_axi_arid+1'b1] == 1'b0);
|
| 586 |
|
|
assume((!F_CHECK_IDS)
|
| 587 |
|
|
||(f_axi_rd_id_outstanding[i_axi_arid] == 1'b0));
|
| 588 |
|
|
f_axi_rd_id_outstanding[i_axi_arid] <= 1'b1;
|
| 589 |
|
|
end
|
| 590 |
|
|
|
| 591 |
|
|
// When a write is acknowledged
|
| 592 |
|
|
if (axi_wr_ack)
|
| 593 |
|
|
begin
|
| 594 |
|
|
if (F_CHECK_IDS)
|
| 595 |
|
|
begin
|
| 596 |
|
|
assert(f_axi_awr_id_outstanding[i_axi_bid]);
|
| 597 |
|
|
assert(f_axi_wr_id_outstanding[i_axi_bid]);
|
| 598 |
|
|
assert((!F_STRICT_ORDER)||(!F_CONSECUTIVE_IDS)
|
| 599 |
|
|
||(!f_axi_wr_id_outstanding[i_axi_bid-1'b1]));
|
| 600 |
|
|
assert((!F_STRICT_ORDER)||(!F_CONSECUTIVE_IDS)
|
| 601 |
|
|
||(!f_axi_awr_id_outstanding[i_axi_bid-1'b1]));
|
| 602 |
|
|
assert(f_axi_wr_id_complete[i_axi_bid]);
|
| 603 |
|
|
end
|
| 604 |
|
|
f_axi_awr_id_outstanding[i_axi_bid] <= 1'b0;
|
| 605 |
|
|
f_axi_wr_id_outstanding[i_axi_bid] <= 1'b0;
|
| 606 |
|
|
f_axi_wr_id_complete[i_axi_bid] <= 1'b0;
|
| 607 |
|
|
end
|
| 608 |
|
|
|
| 609 |
|
|
// When a read is acknowledged
|
| 610 |
|
|
if (axi_rd_ack)
|
| 611 |
|
|
begin
|
| 612 |
|
|
if (F_CHECK_IDS)
|
| 613 |
|
|
begin
|
| 614 |
|
|
assert(f_axi_rd_id_outstanding[i_axi_rid]);
|
| 615 |
|
|
assert((!F_STRICT_ORDER)||(!F_CONSECUTIVE_IDS)
|
| 616 |
|
|
||(!f_axi_rd_id_outstanding[i_axi_rid-1'b1]));
|
| 617 |
|
|
end
|
| 618 |
|
|
|
| 619 |
|
|
if (i_axi_rlast)
|
| 620 |
|
|
f_axi_rd_id_outstanding[i_axi_rid] <= 1'b0;
|
| 621 |
|
|
end
|
| 622 |
|
|
end
|
| 623 |
|
|
|
| 624 |
|
|
|
| 625 |
|
|
reg [LGFIFOLN:0] f_axi_rd_id_outstanding_count,
|
| 626 |
|
|
f_axi_awr_id_outstanding_count,
|
| 627 |
|
|
f_axi_wr_id_outstanding_count;
|
| 628 |
|
|
|
| 629 |
|
|
initial f_axi_rd_id_outstanding_count = 0;
|
| 630 |
|
|
initial f_axi_awr_id_outstanding_count = 0;
|
| 631 |
|
|
initial f_axi_wr_id_outstanding_count = 0;
|
| 632 |
|
|
always @(*)
|
| 633 |
|
|
begin
|
| 634 |
|
|
//
|
| 635 |
|
|
f_axi_rd_id_outstanding_count = 0;
|
| 636 |
|
|
for(k=0; k< FIFOLN; k=k+1)
|
| 637 |
|
|
if (f_axi_rd_id_outstanding[k])
|
| 638 |
|
|
f_axi_rd_id_outstanding_count
|
| 639 |
|
|
= f_axi_rd_id_outstanding_count +1;
|
| 640 |
|
|
//
|
| 641 |
|
|
f_axi_wr_id_outstanding_count = 0;
|
| 642 |
|
|
for(k=0; k< FIFOLN; k=k+1)
|
| 643 |
|
|
if (f_axi_wr_id_outstanding[k])
|
| 644 |
|
|
f_axi_wr_id_outstanding_count = f_axi_wr_id_outstanding_count +1;
|
| 645 |
|
|
f_axi_awr_id_outstanding_count = 0;
|
| 646 |
|
|
for(k=0; k< FIFOLN; k=k+1)
|
| 647 |
|
|
if (f_axi_awr_id_outstanding[k])
|
| 648 |
|
|
f_axi_awr_id_outstanding_count = f_axi_awr_id_outstanding_count +1;
|
| 649 |
|
|
end
|
| 650 |
|
|
|
| 651 |
|
|
always @(*)
|
| 652 |
|
|
assume((!F_CHECK_IDS)||(f_axi_awr_outstanding== f_axi_awr_id_outstanding_count));
|
| 653 |
|
|
|
| 654 |
|
|
always @(*)
|
| 655 |
|
|
assume((!F_CHECK_IDS)||(f_axi_wr_outstanding == f_axi_wr_id_outstanding_count));
|
| 656 |
|
|
|
| 657 |
|
|
always @(*)
|
| 658 |
|
|
assume((!F_CHECK_IDS)||(f_axi_rd_outstanding == f_axi_rd_id_outstanding_count));
|
| 659 |
|
|
|
| 660 |
|
|
always @(*)
|
| 661 |
|
|
assume( ((f_axi_wr_id_complete)&(~f_axi_awr_id_outstanding)) == 0);
|
| 662 |
|
|
|
| 663 |
|
|
generate if (F_OPT_BURSTS)
|
| 664 |
|
|
begin
|
| 665 |
|
|
reg [(8-1):0] f_rd_pending [0:(FIFOLN-1)];
|
| 666 |
|
|
reg [(8-1):0] f_wr_pending,
|
| 667 |
|
|
f_rd_count, f_wr_count;
|
| 668 |
|
|
|
| 669 |
|
|
reg r_last_rd_id_valid,
|
| 670 |
|
|
r_last_wr_id_valid;
|
| 671 |
|
|
|
| 672 |
|
|
reg [(C_AXI_ID_WIDTH-1):0] r_last_wr_id, r_last_rd_id;
|
| 673 |
|
|
|
| 674 |
|
|
initial r_last_wr_id_valid = 1'b0;
|
| 675 |
|
|
initial r_last_rd_id_valid = 1'b0;
|
| 676 |
|
|
always @(posedge i_clk)
|
| 677 |
|
|
if (!i_axi_reset_n)
|
| 678 |
|
|
begin
|
| 679 |
|
|
r_last_wr_id_valid <= 1'b0;
|
| 680 |
|
|
r_last_rd_id_valid <= 1'b0;
|
| 681 |
|
|
f_wr_count <= 0;
|
| 682 |
|
|
f_rd_count <= 0;
|
| 683 |
|
|
end else begin
|
| 684 |
|
|
if (axi_awr_req)
|
| 685 |
|
|
begin
|
| 686 |
|
|
f_wr_pending <= i_axi_awlen+9'h1;
|
| 687 |
|
|
assume(f_wr_pending == 0);
|
| 688 |
|
|
r_last_wr_id_valid <= 1'b1;
|
| 689 |
|
|
end
|
| 690 |
|
|
|
| 691 |
|
|
if (axi_ard_req)
|
| 692 |
|
|
f_rd_pending[i_axi_arid] <= i_axi_arlen+9'h1;
|
| 693 |
|
|
|
| 694 |
|
|
|
| 695 |
|
|
if ((axi_wr_req)&&(i_axi_wlast))
|
| 696 |
|
|
begin
|
| 697 |
|
|
f_wr_count <= 0;
|
| 698 |
|
|
r_last_wr_id_valid <= 1'b0;
|
| 699 |
|
|
assume(
|
| 700 |
|
|
// Either this is the last
|
| 701 |
|
|
// of a series of requests we've
|
| 702 |
|
|
// been waiting for,
|
| 703 |
|
|
(f_wr_pending == f_wr_count - 9'h1)
|
| 704 |
|
|
// *or* the only value
|
| 705 |
|
|
// associated with an as yet
|
| 706 |
|
|
// to be counted request
|
| 707 |
|
|
||((axi_awr_req)&&(i_axi_awlen == 0)));
|
| 708 |
|
|
end else if (axi_wr_req)
|
| 709 |
|
|
f_wr_count <= f_wr_count + 1'b1;
|
| 710 |
|
|
|
| 711 |
|
|
if (axi_rd_ack)
|
| 712 |
|
|
begin
|
| 713 |
|
|
if (i_axi_rlast)
|
| 714 |
|
|
r_last_rd_id_valid <= 1'b0;
|
| 715 |
|
|
else
|
| 716 |
|
|
r_last_rd_id_valid <= 1'b1;
|
| 717 |
|
|
|
| 718 |
|
|
r_last_rd_id <= i_axi_rid;
|
| 719 |
|
|
if ((axi_rd_ack)&&(r_last_rd_id_valid))
|
| 720 |
|
|
assert(i_axi_rid == r_last_rd_id);
|
| 721 |
|
|
end
|
| 722 |
|
|
|
| 723 |
|
|
if ((axi_rd_ack)&&(i_axi_rlast))
|
| 724 |
|
|
assume(f_rd_count == f_rd_pending[i_axi_rid]-9'h1);
|
| 725 |
|
|
if ((axi_rd_ack)&&(i_axi_rlast))
|
| 726 |
|
|
f_rd_count <= 0;
|
| 727 |
|
|
else if (axi_rd_ack)
|
| 728 |
|
|
f_rd_count <= f_rd_count + 1'b1;
|
| 729 |
|
|
end
|
| 730 |
|
|
end else begin
|
| 731 |
|
|
always @(*) begin
|
| 732 |
|
|
// Since we aren't allowing bursts, *every*
|
| 733 |
|
|
// write data and read data must always be the last
|
| 734 |
|
|
// value
|
| 735 |
|
|
assume((i_axi_wlast)||(!i_axi_wvalid));
|
| 736 |
|
|
assert((i_axi_rlast)||(!i_axi_rvalid));
|
| 737 |
|
|
|
| 738 |
|
|
assume((!i_axi_arvalid)||(i_axi_arlen==0));
|
| 739 |
|
|
assume((!i_axi_awvalid)||(i_axi_awlen==0));
|
| 740 |
|
|
end
|
| 741 |
|
|
|
| 742 |
|
|
always @(posedge i_clk)
|
| 743 |
|
|
if (i_axi_awvalid)
|
| 744 |
|
|
assume(i_axi_awlen == 0);
|
| 745 |
|
|
always @(posedge i_clk)
|
| 746 |
|
|
if (i_axi_arvalid)
|
| 747 |
|
|
assume(i_axi_arlen == 0);
|
| 748 |
|
|
always @(posedge i_clk)
|
| 749 |
|
|
if (i_axi_wvalid)
|
| 750 |
|
|
assume(i_axi_wlast);
|
| 751 |
|
|
always @(posedge i_clk)
|
| 752 |
|
|
if (i_axi_rvalid)
|
| 753 |
|
|
assert(i_axi_rlast);
|
| 754 |
|
|
end endgenerate
|
| 755 |
|
|
|
| 756 |
|
|
`endif
|
| 757 |
|
|
endmodule
|
