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[/] [uart2bus_testbench/] [trunk/] [tb/] [uvm_src/] [seq/] [uvm_sequence.svh] - Rev 16
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//----------------------------------------------------------------------
// Copyright 2007-2011 Mentor Graphics Corporation
// Copyright 2007-2010 Cadence Design Systems, Inc.
// Copyright 2010 Synopsys, Inc.
// Copyright 2013 Cisco Systems, Inc.
// All Rights Reserved Worldwide
//
// Licensed under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in
// compliance with the License. You may obtain a copy of
// the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in
// writing, software distributed under the License is
// distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
// CONDITIONS OF ANY KIND, either express or implied. See
// the License for the specific language governing
// permissions and limitations under the License.
//----------------------------------------------------------------------
//------------------------------------------------------------------------------
//
// CLASS: uvm_sequence #(REQ,RSP)
//
// The uvm_sequence class provides the interfaces necessary in order to create
// streams of sequence items and/or other sequences.
//
//------------------------------------------------------------------------------
virtual class uvm_sequence #(type REQ = uvm_sequence_item,
type RSP = REQ) extends uvm_sequence_base;
typedef uvm_sequencer_param_base #(REQ, RSP) sequencer_t;
sequencer_t param_sequencer;
// Variable: req
//
// The sequence contains a field of the request type called req. The user
// can use this field, if desired, or create another field to use. The
// default ~do_print~ will print this field.
REQ req;
// Variable: rsp
//
// The sequence contains a field of the response type called rsp. The user
// can use this field, if desired, or create another field to use. The
// default ~do_print~ will print this field.
RSP rsp;
// Function: new
//
// Creates and initializes a new sequence object.
function new (string name = "uvm_sequence");
super.new(name);
endfunction
// Function: send_request
//
// This method will send the request item to the sequencer, which will forward
// it to the driver. If the rerandomize bit is set, the item will be
// randomized before being sent to the driver. The send_request function may
// only be called after <uvm_sequence_base::wait_for_grant> returns.
function void send_request(uvm_sequence_item request, bit rerandomize = 0);
REQ m_request;
if (m_sequencer == null) begin
uvm_report_fatal("SSENDREQ", "Null m_sequencer reference", UVM_NONE);
end
if (!$cast(m_request, request)) begin
uvm_report_fatal("SSENDREQ", "Failure to cast uvm_sequence_item to request", UVM_NONE);
end
m_sequencer.send_request(this, m_request, rerandomize);
endfunction
// Function: get_current_item
//
// Returns the request item currently being executed by the sequencer. If the
// sequencer is not currently executing an item, this method will return ~null~.
//
// The sequencer is executing an item from the time that get_next_item or peek
// is called until the time that get or item_done is called.
//
// Note that a driver that only calls get will never show a current item,
// since the item is completed at the same time as it is requested.
function REQ get_current_item();
if (!$cast(param_sequencer, m_sequencer))
uvm_report_fatal("SGTCURR", "Failure to cast m_sequencer to the parameterized sequencer", UVM_NONE);
return (param_sequencer.get_current_item());
endfunction
// Task: get_response
//
// By default, sequences must retrieve responses by calling get_response.
// If no transaction_id is specified, this task will return the next response
// sent to this sequence. If no response is available in the response queue,
// the method will block until a response is received.
//
// If a transaction_id is parameter is specified, the task will block until
// a response with that transaction_id is received in the response queue.
//
// The default size of the response queue is 8. The get_response method must
// be called soon enough to avoid an overflow of the response queue to prevent
// responses from being dropped.
//
// If a response is dropped in the response queue, an error will be reported
// unless the error reporting is disabled via
// set_response_queue_error_report_disabled.
virtual task get_response(output RSP response, input int transaction_id = -1);
uvm_sequence_item rsp;
get_base_response( rsp, transaction_id);
$cast(response,rsp);
endtask
// Function- put_response
//
// Internal method.
virtual function void put_response(uvm_sequence_item response_item);
RSP response;
if (!$cast(response, response_item)) begin
uvm_report_fatal("PUTRSP", "Failure to cast response in put_response", UVM_NONE);
end
put_base_response(response_item);
endfunction
// Function- do_print
//
function void do_print (uvm_printer printer);
super.do_print(printer);
printer.print_object("req", req);
printer.print_object("rsp", rsp);
endfunction
endclass