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mem: Add tRTP to the DRAM controller

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This patch adds the tRTP timing constraint, governing the minimum time
between a read command and a precharge. Default values are provided
for the existing DRAM types.
This commit is contained in:
Andreas Hansson
2014-05-09 18:58:48 -04:00
parent 60799dc552
commit 6753cb705e
3 changed files with 23 additions and 8 deletions
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17
src/mem/dram_ctrl.cc
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@@ -76,7 +76,7 @@ DRAMCtrl::DRAMCtrl(const DRAMCtrlParams* p) :
writesThisTime(0), readsThisTime(0),
tWTR(p->tWTR), tRTW(p->tRTW), tBURST(p->tBURST),
tRCD(p->tRCD), tCL(p->tCL), tRP(p->tRP), tRAS(p->tRAS), tWR(p->tWR),
tRFC(p->tRFC), tREFI(p->tREFI), tRRD(p->tRRD),
tRTP(p->tRTP), tRFC(p->tRFC), tREFI(p->tREFI), tRRD(p->tRRD),
tXAW(p->tXAW), activationLimit(p->activation_limit),
memSchedPolicy(p->mem_sched_policy), addrMapping(p->addr_mapping),
pageMgmt(p->page_policy),
@@ -560,9 +560,10 @@ DRAMCtrl::printParams() const
"tWTR %d ticks\n" \
"tRTW %d ticks\n" \
"tWR %d ticks\n" \
"tRTP %d ticks\n" \
"tXAW (%d) %d ticks\n",
name(), tRCD, tCL, tRP, tBURST, tRFC, tREFI, tWTR,
tRTW, tWR, activationLimit, tXAW);
tRTW, tWR, tRTP, activationLimit, tXAW);
}
void
@@ -993,12 +994,12 @@ DRAMCtrl::doDRAMAccess(DRAMPacket* dram_pkt)
// read/write (add a max with tCCD here)
bank.colAllowedAt = cmd_at + tBURST;
// If this is a write, we also need to respect the write
// recovery time before a precharge
if (!dram_pkt->isRead) {
bank.preAllowedAt = std::max(bank.preAllowedAt,
dram_pkt->readyTime + tWR);
}
// If this is a write, we also need to respect the write recovery
// time before a precharge, in the case of a read, respect the
// read to precharge constraint
bank.preAllowedAt = std::max(bank.preAllowedAt,
dram_pkt->isRead ? cmd_at + tRTP :
dram_pkt->readyTime + tWR);
// increment the bytes accessed and the accesses per row
bank.bytesAccessed += burstSize;