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/*
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* .--------------. .----------------. .------------.
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* | .------------. | .--------------. | .----------. |
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* | | ____ ____ | | | ____ ____ | | | ______ | |
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* | ||_ || _|| | ||_ \ / _|| | | .' ___ || |
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* ___ _ __ ___ _ __ | | | |__| | | | | | \/ | | | |/ .' \_|| |
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* / _ \| '_ \ / _ \ '_ \ | | | __ | | | | | |\ /| | | | || | | |
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* (_) | |_) | __/ | | || | _| | | |_ | | | _| |_\/_| |_ | | |\ `.___.'\| |
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* \___/| .__/ \___|_| |_|| ||____||____|| | ||_____||_____|| | | `._____.'| |
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* | | | | | | | | | | | |
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* |_| | '------------' | '--------------' | '----------' |
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* '--------------' '----------------' '------------'
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*
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* openHMC - An Open Source Hybrid Memory Cube Controller
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* (C) Copyright 2014 Computer Architecture Group - University of Heidelberg
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* www.ziti.uni-heidelberg.de
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* B6, 26
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* 68159 Mannheim
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* Germany
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*
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* Contact: openhmc@ziti.uni-heidelberg.de
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* http://ra.ziti.uni-heidelberg.de/openhmc
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*
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* This source file is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This source file is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this source file. If not, see .
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*
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*
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*/
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`ifndef HMC_REQUESTER_SEQUENCE_SV
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`define HMC_REQUESTER_SEQUENCE_SV
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/* sequence is incomplete and not tested */
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/* Use at your own risk */
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class hmc_requester_sequence extends uvm_sequence;
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rand int delay;
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rand hmc_packet response;
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rand bit error_response;
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event item_available;
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hmc_packet response_queue[$];
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constraint delay_c {
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delay dist {0:=4, [0:9]:=8, [10:30]:=2, [31:100]:=1};
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}
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`uvm_object_utils(hmc_requester_sequence)
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`uvm_declare_p_sequencer(hmc_requester_sequencer)
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function new(string name="hmc_requester_sequence");
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super.new(name);
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endfunction : new
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task create_response_packet(hmc_packet request);
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int response_length = 1;
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int new_timestamp;
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bit [127:0] rand_flit;
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bit [127:0] payload_flits [$];
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`uvm_info(get_type_name(),$psprintf("Generating response for a %s @%0x",request.command.name(), request.address),UVM_HIGH)
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`uvm_create(response);
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void'(this.randomize(error_response));
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void'(this.randomize(delay));
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new_timestamp = delay * 500ps + $time;
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if (request.get_command_type() == HMC_READ_TYPE) begin : read
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case (request.command)
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HMC_READ_16 : response_length = 2;
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HMC_READ_32 : response_length = 3;
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HMC_READ_48 : response_length = 4;
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HMC_READ_64 : response_length = 5;
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HMC_READ_80 : response_length = 6;
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HMC_READ_96 : response_length = 7;
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HMC_READ_112 : response_length = 8;
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HMC_READ_128 : response_length = 9;
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endcase
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// Randomize the packet
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void'(response.randomize() with {
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command == HMC_READ_RESPONSE;
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address == request.address; // for debugging
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packet_length == response_length;
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duplicate_length == response_length;
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tag == request.tag;
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error_status == 0 || error_response;
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});
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for (int i=0; i
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randomize_flit_successful : assert (std::randomize(rand_flit))
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payload_flits.push_front(rand_flit);
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end
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response.payload = payload_flits;
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response.timestamp = new_timestamp;
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enqueue_response_packet(response);
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end : read
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else if (request.get_command_type() == HMC_WRITE_TYPE) begin : write
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response_length = 1;
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void'(response.randomize() with {
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command == HMC_WRITE_RESPONSE;
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address == request.address; // for debugging
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packet_length == response_length;
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duplicate_length == response_length;
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tag == request.tag;
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error_status == 0 || error_response;
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});
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response.timestamp = new_timestamp;
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enqueue_response_packet(response);
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end : write
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// Posted Writes are allowed, but get no response
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else if ( request.get_command_type() != HMC_POSTED_WRITE_TYPE ||
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request.get_command_type() != HMC_POSTED_MISC_WRITE_TYPE
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) begin : error
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uvm_report_fatal(get_type_name(), $psprintf("Unsupported command type %s", request.command.name()));
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end : error
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endtask : create_response_packet
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task enqueue_response_packet(hmc_packet response);
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// Insert at the end when the queue is empty or
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if (response_queue.size() == 0 ||
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// when the timestamp is larger than the tail of the queue
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response.timestamp >= response_queue[response_queue.size()-1].timestamp) begin
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response_queue.push_back(response);
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// Insert at the beginning of the queue when the timestamp is small
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end else if (response.timestamp <= response_queue[0].timestamp) begin
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response_queue.push_front(response);
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end else begin
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for (int position=1;position < response_queue.size(); position++) begin
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if (response.timestamp < response_queue[position].timestamp) begin
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response_queue = {response_queue[0:position-1], response, response_queue[position:$]};
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position = response_queue.size(); // Break
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end
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end
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end
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// Signal via event that a response has been added
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-> item_available;
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endtask : enqueue_response_packet
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task body();
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void'(this.randomize());
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fork
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// Convert requests to responses
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forever begin : tranlsate_loop
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hmc_packet packet;
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p_sequencer.req_mailbox.get(packet);
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create_response_packet(packet);
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end : tranlsate_loop
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//
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begin
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hmc_packet packet;
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forever begin : send_loop
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if (response_queue.size() > 0) begin
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int time_to_wait;
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time_to_wait = response_queue[0].timestamp - $time;
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if (time_to_wait <= 0) begin
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packet = response_queue.pop_front();
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uvm_report_info(get_type_name(), $psprintf("Sending response packet: %s", packet.command.name()), UVM_HIGH);
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`uvm_send(packet)
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end else begin
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#time_to_wait;
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end
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end
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else begin
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// Wait for items to get added to the queue
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if (response_queue.size() == 0)
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@(item_available);
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end
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end : send_loop
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end
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join
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endtask : body
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endclass : hmc_requester_sequence
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`endif // HMC_REQUESTER_SEQUENCE_SV
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