xbar.cc (10414:3dabe649f1df) xbar.cc (10694:1a6785e37d81)
1/*
2 * Copyright (c) 2011-2014 ARM Limited
3 * All rights reserved
4 *
5 * The license below extends only to copyright in the software and shall
6 * not be construed as granting a license to any other intellectual
7 * property including but not limited to intellectual property relating
8 * to a hardware implementation of the functionality of the software

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104void
105BaseXBar::calcPacketTiming(PacketPtr pkt)
106{
107 // the crossbar will be called at a time that is not necessarily
108 // coinciding with its own clock, so start by determining how long
109 // until the next clock edge (could be zero)
110 Tick offset = clockEdge() - curTick();
111
1/*
2 * Copyright (c) 2011-2014 ARM Limited
3 * All rights reserved
4 *
5 * The license below extends only to copyright in the software and shall
6 * not be construed as granting a license to any other intellectual
7 * property including but not limited to intellectual property relating
8 * to a hardware implementation of the functionality of the software

--- 95 unchanged lines hidden (view full) ---

104void
105BaseXBar::calcPacketTiming(PacketPtr pkt)
106{
107 // the crossbar will be called at a time that is not necessarily
108 // coinciding with its own clock, so start by determining how long
109 // until the next clock edge (could be zero)
110 Tick offset = clockEdge() - curTick();
111
112 // determine how many cycles are needed to send the data
112 // Determine how many cycles are needed to send the data
113 // If the packet has no data we take into account just the cycle to send
114 // the header.
113 unsigned dataCycles = pkt->hasData() ? divCeil(pkt->getSize(), width) : 0;
114
115 // before setting the bus delay fields of the packet, ensure that
116 // the delay from any previous crossbar has been accounted for
115 unsigned dataCycles = pkt->hasData() ? divCeil(pkt->getSize(), width) : 0;
116
117 // before setting the bus delay fields of the packet, ensure that
118 // the delay from any previous crossbar has been accounted for
117 if (pkt->firstWordDelay != 0 || pkt->lastWordDelay != 0)
119 if (pkt->headerDelay != 0 || pkt->payloadDelay != 0)
118 panic("Packet %s already has delay (%d, %d) that should be "
120 panic("Packet %s already has delay (%d, %d) that should be "
119 "accounted for.\n", pkt->cmdString(), pkt->firstWordDelay,
120 pkt->lastWordDelay);
121 "accounted for.\n", pkt->cmdString(), pkt->headerDelay,
122 pkt->payloadDelay);
121
123
122 // The first word will be delivered on the cycle after the header.
123 pkt->firstWordDelay = (headerCycles + 1) * clockPeriod() + offset;
124 // The headerDelay takes into account the relative time to deliver the
125 // header of the packet. It will be charged of the additional delay of
126 // the xbar if the packet goes through it.
127 pkt->headerDelay = (headerCycles + 1) * clockPeriod() + offset;
124
128
125 // Note that currently lastWordDelay can be smaller than
126 // firstWordDelay if the packet has no data
127 pkt->lastWordDelay = (headerCycles + dataCycles) * clockPeriod() +
128 offset;
129 // The payloadDelay takes into account the relative time to deliver the
130 // payload of the packet. If the packet has no data its value is just one
131 // tick (due to header) plus the offset value.
132 pkt->payloadDelay = (headerCycles + dataCycles) * clockPeriod() + offset;
129}
130
131template <typename SrcType, typename DstType>
132BaseXBar::Layer<SrcType,DstType>::Layer(DstType& _port, BaseXBar& _xbar,
133 const std::string& _name) :
134 port(_port), xbar(_xbar), _name(_name), state(IDLE), drainManager(NULL),
135 waitingForPeer(NULL), releaseEvent(this)
136{

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134
135template <typename SrcType, typename DstType>
136BaseXBar::Layer<SrcType,DstType>::Layer(DstType& _port, BaseXBar& _xbar,
137 const std::string& _name) :
138 port(_port), xbar(_xbar), _name(_name), state(IDLE), drainManager(NULL),
139 waitingForPeer(NULL), releaseEvent(this)
140{

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