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antanguay |
/**
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* 10 GE MAC Core verification environment driver file.
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* @file: driver.sv
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* @author: Pratik Mahajan
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* @par Contact: pratik@e-pigeonpost.com
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* @par Company: UCSC (SV 1896 Systemverilog for advanced verification course)
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*
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* @version: $LastChangedRevision$
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* @par Last Changed Date:
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* $LastChangedDate$
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* @par Last Changed By:
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* $LastChangedBy$
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*/
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/**
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* Driver class to send packet from test environment to DUT (10GE MAC Core).
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* Driver only talks with Tx interface of 10 GE MAC Core, This class will provide
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* packet data to MAC Core as represented in specification requirement.
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* @class driver
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* @par virtual macCoreInterface to connect class objects with DUT
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*/
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class driver;
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virtual macCoreInterface virtualMacCoreInterface; ///< Virtual interface to connect class types with RTL.
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mailbox driver2Scoreboard;
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const bit ASSERT = 1'b1; ///< to assert sequence while transsion of packet
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const bit DEASSERT = 1'b0; ///< to deassert sequence while transmission of packet
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// packetFrame driverPacket;
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/**
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* Constructor for driver class -- main purpose is to connect design interface with class virtual interface.
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* @param virtualInterface -- virtual interface passed down from env class
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* @return: NA (creates object of type class and returns handle
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*/
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function new (virtual macCoreInterface virtualInterface,
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input mailbox driver2Scoreboard
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);
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this.virtualMacCoreInterface = virtualInterface;
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this.driver2Scoreboard = driver2Scoreboard;
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endfunction // new
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/**
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* Task to send complete packet data to the input of RTL (10 GE MAC Core).
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* send_packet should follow protocol requirements specified in requirement specifications (except if it is used for error injection)
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* protocol requirement:
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* assert: packetValid
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* make sure sop, eop and mod are set to 0 at start of packet (do it at the end of each packet transmission or right here)
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* if sending 0th frame assert sop
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* if sending last fram assert eop and mod
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* put all data on packetData
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* wait for a clock edge and de-assert packetValid, eop and mod (at this point sop is still asserted ??)
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* packet class itself will take care of keeping track of number of objects created.
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*/
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task send_packet (input int lengthOfFrame);
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packet macCore; ///< object of type packet that will be transmitted to DUT
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virtualMacCoreInterface.clockingTxRx.transmitValid <= ASSERT;
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for (int i = 0; i < lengthOfFrame; i+=8)
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begin
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macCore = new (TRANSMIT);
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assert (macCore.randomize ());
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macCore.startOfPacket = DEASSERT;
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macCore.endOfPacket = DEASSERT;
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macCore.packetLengthModulus = 3'b0;
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if (i == 0) macCore.startOfPacket = ASSERT;
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//virtualMacCoreInterface.clockingTxRx.transmitStartOfPacket <= ASSERT;
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if (i+8 >= lengthOfFrame) begin
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macCore.endOfPacket = ASSERT;
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macCore.packetLengthModulus = lengthOfFrame % 8;
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// virtualMacCoreInterface.clockingTxRx.transmitEndOfPacket <= ASSERT;
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// virtualMacCoreInterface.clockingTxRx.transmitPacketLengthModulus <= lengthOfFrame % 8;
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end
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virtualMacCoreInterface.clockingTxRx.transmitStartOfPacket <= macCore.startOfPacket;
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virtualMacCoreInterface.clockingTxRx.transmitEndOfPacket <= macCore.endOfPacket;
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virtualMacCoreInterface.clockingTxRx.transmitPacketLengthModulus <= macCore.packetLengthModulus;
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virtualMacCoreInterface.clockingTxRx.transmitData <= { macCore.packetData [7],
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macCore.packetData [6],
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macCore.packetData [5],
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macCore.packetData [4],
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macCore.packetData [3],
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macCore.packetData [2],
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macCore.packetData [1],
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macCore.packetData [0] };
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macCore.print (TRANSMIT);
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driver2Scoreboard.put (macCore);
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@(virtualMacCoreInterface.clockingTxRx);
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end // for (int i = 0; i < lengthOfFrame; i+=8)
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virtualMacCoreInterface.clockingTxRx.transmitValid <= DEASSERT;
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virtualMacCoreInterface.clockingTxRx.transmitEndOfPacket <= DEASSERT;
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virtualMacCoreInterface.clockingTxRx.transmitPacketLengthModulus <= 3'b0;
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endtask // send_packet
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endclass // driver
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