ARM Cortex-A15 MPCore Processor Technical Reference Manual

System Control31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0Table 4-53 shows the ACTLR bit assignments.Bits Name FunctionEnable invalidatesof BTBDisable loop bufferLimit to one loop bufferDisable micro-BTBDisable indirect predictorExecute PLD instructions as a NOPSMPExecute WFE instruction as a NOPExecute WFI instruction as a NOPDisable flag renaming optimizationForce serialization after each groupLimit to one instruction per instruction groupForce push of CP14/CP15 registersFlush after CP14/CP15 writesForce limit of one group commit/deallocate per cycleForce in-order issue in branch execution unitEnable full Strongly Ordered and Device load replayDisable L2 TLB performance optimizationDisable L2 stage 1 translation table walk L2 PA cacheDisable L2 stage 1 translation table walk cacheDisable L2 translation table walk IPA PA cacheDisable L2 TLB prefetchingForce in-order load issueForce in-order requests to the same set and wayNon-cacheable streaming enhancementWrite streaming no L1-allocate thresholdWrite streaming no-allocate thresholdForce NEON/VFP clock enable activeForce main clock enable activeSnoop-delayed exclusive handlingFigure 4-24 ACTLR bit assignmentsTable 4-53 ACTLR bit assignments[31] Snoop-delayed exclusive handling Snoop-delayed exclusive handling. You must set this bit to 1'b1 in any systemwith three or more processors that can execute exclusive accesses:0 Normal exclusive handling behavior. This is the reset value.1 Modifies exclusive handling behavior by delaying certainsnoop requests.[30] a Force main clock enable active Forces main processor clock enable active:0 Does not prevent the clock generator from stopping theprocessor clock. This is the reset value.1 Prevents the clock generator from stopping the processor clock.[29] a Force NEON/VFP clock enable active Forces NEON and VFP unit clock enable active:0 Does not prevent the clock generator from stopping the NEONand VFP unit clock. This is the reset value.1 Prevents the clock generator from stopping the NEON and VFPunit clock.ARM DDI 0438I Copyright © 2011-2013 ARM. All rights reserved. 4-58ID062913Non-Confidential