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//
// Copyright 2018 Ettus Research, a National Instruments Company
//
// SPDX-License-Identifier: LGPL-3.0-or-later
//
// Description:
// This module is instantiated in parallel with a FIFO with AXI4-STREAM interfaces.
// It tracks how many complete packets are contained within the FIFO, and also indicates
// when the first word of a packet is presented on the FIFO outputs.
module axis_fifo_monitor #(
parameter COUNT_W = 32
)(
// Clocks and resets
input wire clk,
input wire reset,
// FIFO Input
input wire i_tlast,
input wire i_tvalid,
input wire i_tready,
// FIFO Output
input wire o_tlast,
input wire o_tvalid,
input wire o_tready,
// FIFO Stats
output wire i_sop,
output wire i_eop,
output wire o_sop,
output wire o_eop,
output wire [COUNT_W-1:0] occupied,
output wire [COUNT_W-1:0] occupied_pkts
);
wire [COUNT_W-1:0] i_pkt_count, o_pkt_count;
wire [COUNT_W-1:0] i_xfer_count, o_xfer_count;
axis_strm_monitor #(
.WIDTH(1), .COUNT_W(COUNT_W),
.PKT_LENGTH_EN(0), .PKT_CHKSUM_EN(0),
.PKT_COUNT_EN(1), .XFER_COUNT_EN(1)
) input_monitor (
.clk(clk), .reset(reset),
.axis_tdata(1'b0), .axis_tlast(i_tlast), .axis_tvalid(i_tvalid), .axis_tready(i_tready),
.sop(i_sop), .eop(i_eop),
.pkt_length(), .pkt_chksum(),
.pkt_count(i_pkt_count), .xfer_count(i_xfer_count)
);
axis_strm_monitor #(
.WIDTH(1), .COUNT_W(COUNT_W),
.PKT_LENGTH_EN(0), .PKT_CHKSUM_EN(0),
.PKT_COUNT_EN(1), .XFER_COUNT_EN(1)
) output_monitor (
.clk(clk), .reset(reset),
.axis_tdata(1'b0), .axis_tlast(o_tlast), .axis_tvalid(o_tvalid), .axis_tready(o_tready),
.sop(o_sop), .eop(o_eop),
.pkt_length(), .pkt_chksum(),
.pkt_count(o_pkt_count), .xfer_count(o_xfer_count)
);
// Count packets in FIFO.
// No protection on counter wrap,
assign occupied = (i_xfer_count - o_xfer_count);
assign occupied_pkts = (i_pkt_count - o_pkt_count);
endmodule
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