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[/] [ht_tunnel/] [trunk/] [rtl/] [systemc/] [errorhandler_l2/] [errorhandler_l2.cpp] - Rev 2
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//ht_errorHandler.cpp /* ***** BEGIN LICENSE BLOCK ***** * Version: MPL 1.1 * * The contents of this file are subject to the Mozilla Public License Version * 1.1 (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.mozilla.org/MPL/ * * Software distributed under the License is distributed on an "AS IS" basis, * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License * for the specific language governing rights and limitations under the * License. * * The Original Code is HyperTransport Tunnel IP Core. * * The Initial Developer of the Original Code is * Ecole Polytechnique de Montreal. * Portions created by the Initial Developer are Copyright (C) 2005 * the Initial Developer. All Rights Reserved. * * Contributor(s): * Martin Corriveau * Ami Castonguay <acastong@grm.polymtl.ca> * * Alternatively, the contents of this file may be used under the terms * of the Polytechnique HyperTransport Tunnel IP Core Source Code License * (the "PHTICSCL License", see the file PHTICSCL.txt), in which case the * provisions of PHTICSCL License are applicable instead of those * above. If you wish to allow use of your version of this file only * under the terms of the PHTICSCL License and not to allow others to use * your version of this file under the MPL, indicate your decision by * deleting the provisions above and replace them with the notice and * other provisions required by the PHTICSCL License. If you do not delete * the provisions above, a recipient may use your version of this file * under either the MPL or the PHTICSCL License." * * ***** END LICENSE BLOCK ***** */ #include "errorhandler_l2.h" errorhandler_l2::errorhandler_l2( sc_module_name name) :sc_module(name) { //This is combinatory to it's sensitive to all the variables read by the process SC_METHOD(stateMachine); sensitive << csr_end_of_chain << csr_initcomplete << csr_drop_uninit_link << csr_unit_id << ro_available_fwd << ro_packet_fwd << fc_ack_eh << inputRegister << eh_cmd_data_fc << eh_available_fc << dataLeftToSendm1 << state; //This represents registers, so it's only sensitive to clk and reset SC_METHOD(clockAndReset); sensitive_neg << resetx; sensitive_pos << clk; } void errorhandler_l2::clockAndReset(){ if(resetx.read() == false){ //We have no data to send dataLeftToSendm1 = 0; //Go back to idle state state = IdleState; eh_cmd_data_fc = 0; eh_available_fc = false; syn_ControlPacketComplete defaultPkt; initialize_syn_ControlPacketComplete(defaultPkt); inputRegister = defaultPkt; } else{ eh_available_fc = next_outputReq; dataLeftToSendm1 = next_dataLeftToSendm1; state = next_state; eh_cmd_data_fc = next_outputData; inputRegister = next_inputRegister; } } bool errorhandler_l2::checkEOCError() const { /** End of chain can happen for two reasons : - csr_end_of_chain is asserted, either because we truly are the last element of the chain or because it is set by software - The link is not initialized yet and csr_drop_uninit_link is set. */ if( csr_end_of_chain.read() == true || ( csr_initcomplete.read() == false && csr_drop_uninit_link.read() == true ) ) { return true; } return false; } #ifdef SYSTEMC_SIM /// Trace external function void sc_trace( sc_trace_file *tf, const errorhandler_l2& v, const sc_string& NAME ) { sc_trace(tf,v.clk, NAME + ".clk"); sc_trace(tf,v.ro_packet_fwd, NAME + ".ro_packet_fwd"); sc_trace(tf,v.ro_available_fwd, NAME + ".ro_available_fwd"); sc_trace(tf,v.eh_ack_ro, NAME + ".eh_ack_ro"); sc_trace(tf,v.fc_ack_eh, NAME + ".fc_ack_eh"); sc_trace(tf,v.eh_cmd_data_fc, NAME + ".eh_cmd_data_fc"); sc_trace(tf,v.eh_available_fc, NAME + ".eh_available_fc"); sc_trace(tf,v.eh_address_db, NAME + ".eh_address_db"); sc_trace(tf,v.eh_erase_db, NAME + ".eh_erase_db"); sc_trace(tf,v.eh_vctype_db, NAME + ".eh_vctype_db"); sc_trace(tf,v.csr_end_of_chain, NAME + ".csr_end_of_chain"); sc_trace(tf,v.csr_initcomplete, NAME + ".csr_initcomplete"); sc_trace(tf,v.csr_drop_uninit_link, NAME + ".csr_drop_uninit_link"); sc_trace(tf,v.resetx, NAME + ".resetx"); sc_trace(tf,v.dataLeftToSendm1, NAME + ".dataLeftToSendm1"); } #endif void errorhandler_l2::stateMachine(){ /////////////////////////////////////////////// // Default outputs /////////////////////////////////////////////// eh_ack_ro = false; next_dataLeftToSendm1 = 0; //All 1's because response packets for end of chain errors must only contain 1's next_outputData = "11111111111111111111111111111111"; next_outputReq = false; next_state = IdleState; next_inputRegister = ro_packet_fwd.read(); eh_address_db.write( 0 ); eh_vctype_db.write( VC_NONE ); eh_erase_db = false; //No need for this, reading the packet at the input is a signal that we //received a eoc packet, so no need for an extra signal. //eh_received_eoc_error_csr = false; //General variables that can be used in multiple states sc_bv<64> input_register_pkt = inputRegister.read().packet; PacketCommand input_register_cmd = getPacketCommand(input_register_pkt.range(5,0)); VirtualChannel input_register_vc = getVirtualChannel(input_register_pkt,input_register_cmd); bool dataAssociated = hasDataAssociated(input_register_cmd); switch(state){ /////////////////////////////////////////////// // IDLE STATE /////////////////////////////////////////////// case IdleState : /**If there is a packet and it is a an end of chain error The same packets "signal" goes to both the flow control and the error handler. What dicates who consumes that packet is if we are currently in a end of chain states */ if((checkEOCError() || ro_packet_fwd.read().error64BitExtension) && ro_available_fwd == true){ next_state = AnalyzePacketStateOutputFree; eh_ack_ro = true; } break; /////////////////////////////////////////////// // AnalyzePacketStateOutputLoaded STATE /////////////////////////////////////////////// /** This state means that we have a new packet to analyze in the input buffer but that there is also data in the output buffer waiting to be sent */ case AnalyzePacketStateOutputLoaded : next_outputReq = true; next_outputData = eh_cmd_data_fc.read(); next_state = AnalyzePacketStateOutputLoaded; //This state does roughly he same thing as the next state, but can only //update the output buffers if the FC acks what in the output buffer //If there is no ack, we stop right here and wait for the ack. if(fc_ack_eh.read() == false) break; /** This state means that we have a new packet to analyze in the input buffer and that we can output data to the flow control immediately. */ /////////////////////////////////////////////// // AnalyzePacketStateOutputFree STATE /////////////////////////////////////////////// case AnalyzePacketStateOutputFree : //When we reveice non posted packets, we generate a response with //the MASTER_ABORT bit on if(input_register_vc == VC_NON_POSTED ){ // Construct Response Packet and activate the sending process bool passPW = getPassPW(input_register_pkt); sc_uint<5> dataLengthm1 = getDataLengthm1(input_register_pkt); //sc_uint<5> dataLength = dataLengthm1 + 1; sc_bv<5> reqUID = getUnitID(input_register_pkt); sc_bv<5> srcTag = request_getSrcTag(input_register_pkt); switch( input_register_cmd ){ case READ: case ATOMIC: { /** In the case we received READ or ATOMIC request, we must reply with a response that has the right amount of data requested. */ sc_bv<32> readResponse = generateReadResponse( csr_unit_id.read(), srcTag, reqUID.range(1,0), dataLengthm1, false, RE_MASTER_ABORT, passPW, false); next_outputData = readResponse; next_outputReq = true; next_dataLeftToSendm1 = dataLengthm1; next_state = SendingDataStateInputFree; } break; //case WRITE: default: { /** In the case of a WRITE, we simply respond with a TargetDone */ next_outputData = generateTargetDone( csr_unit_id.read(), srcTag, reqUID.range(1,0), false, RE_MASTER_ABORT, passPW, false); next_outputReq = true; next_state = InputFreeOutputLoaded; } break; } } //In the case of POSTED and RESPONSE vc's, we can't response //We simply flag a bit in the CSR saying that we received an error. else if(input_register_cmd != BROADCAST){ //eh_received_eoc_error_csr = true; } /** If the received packet contained data, we drop it */ if(dataAssociated){ eh_address_db.write( inputRegister.read().data_address ); eh_vctype_db.write( input_register_vc); eh_erase_db = true; } break; /////////////////////////////////////////////// // SendingDataStateInputFree STATE /////////////////////////////////////////////// case SendingDataStateInputFree : next_outputReq = true; next_dataLeftToSendm1 = dataLeftToSendm1; next_state = SendingDataStateInputFree; //If there is a new packet at the input if((checkEOCError() || ro_packet_fwd.read().error64BitExtension) && ro_available_fwd == true){ //If we only have one more data to send and the current data //is being read, load the last data and analyze the new packet if(dataLeftToSendm1.read() == 0 && fc_ack_eh.read() == true) { next_state = AnalyzePacketStateOutputLoaded; } //If we only have one more data to send and the current data //is not being read, we stay else if(dataLeftToSendm1.read() == 0){ next_state = SendingDataStateInputLoaded; next_outputData = eh_cmd_data_fc.read(); } else { next_state = SendingDataStateInputLoaded; if(fc_ack_eh.read() == true){ next_dataLeftToSendm1 = dataLeftToSendm1.read() - 1; } else{ next_outputData = eh_cmd_data_fc.read(); } } eh_ack_ro = true; } else if(fc_ack_eh.read() == true){ if(dataLeftToSendm1.read() == 0){ next_state = InputFreeOutputLoaded; } else{ next_dataLeftToSendm1 = dataLeftToSendm1.read() - 1; } } else{ next_outputData = eh_cmd_data_fc.read(); } break; /////////////////////////////////////////////// // SendingDataStateInputLoaded STATE /////////////////////////////////////////////// case SendingDataStateInputLoaded : next_outputReq = true; next_dataLeftToSendm1 = dataLeftToSendm1; next_state = SendingDataStateInputLoaded; next_inputRegister = inputRegister; if(fc_ack_eh.read() == true){ if(dataLeftToSendm1.read() == 0) next_state = AnalyzePacketStateOutputLoaded; else next_dataLeftToSendm1 = dataLeftToSendm1.read() - 1; } else{ next_outputData = eh_cmd_data_fc.read(); } break; /////////////////////////////////////////////// // InputFreeOutputLoaded STATE /////////////////////////////////////////////// case InputFreeOutputLoaded : next_outputData = eh_cmd_data_fc.read(); next_outputReq = true; if((checkEOCError() || ro_packet_fwd.read().error64BitExtension) && ro_available_fwd == true){ if(fc_ack_eh.read() == true){ next_state = AnalyzePacketStateOutputFree; next_outputReq = false; } else{ next_state = AnalyzePacketStateOutputLoaded; next_outputData = eh_cmd_data_fc.read(); } } else if(fc_ack_eh.read() == true){ next_state = IdleState; next_outputReq = false; } else{ next_state = InputFreeOutputLoaded; next_outputData = eh_cmd_data_fc.read(); } break; } } #ifndef SYSTEMC_SIM #include "../core_synth/synth_control_packet.cpp" #endif
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