Signal Descriptions
ARM DDI 0500D Copyright © 2013-2014 ARM. All rights reserved. A-9
ID021414 Non-Confidential
A.7 Power management signals
Table A-6 shows the non-Retention power management signals.
Table A-7 on page A-10 shows the Retention power management signals.
Table A-6 Non-Retention power management signals
Signal Direction Description
CLREXMONREQ Input Clearing of the external global exclusive monitor request. When this signal is asserted,
it acts as a WFE wake-up event to all the cores in the MPCore device. See CLREXMON
request and acknowledge signaling on page 2-20 for more information.
CLREXMONACK Output Clearing of the external global exclusive monitor acknowledge. See CLREXMON
request and acknowledge signaling on page 2-20 for more information.
EVENTI Input Event input for processor wake-up from WFE state. See Event communication using
WFE or SEV on page 2-25 for more information.
EVENTO Output Event output. Active when a
SEV
instruction is executed. See Event communication using
WFE or SEV on page 2-25 for more information.
STANDBYWFI[CN:0] Output Indicates whether a core is in WFI low-power state:
0
Core not in WFI low-power state.
1
Core in WFI low-power state. This is the reset condition.
STANDBYWFE[CN:0] Output Indicates whether a core is in WFE low-power state:
0
Core not in WFE low-power state.
1
Core in WFE low-power state.
STANDBYWFIL2 Output Indicates whether the L2 memory system is in WFI low-power state. This signal is active
when the following conditions are met:
• All cores are in WFI low-power state, held in reset, or nL2RESET is asserted
LOW.
• In an ACE configuration, ACINACTM is asserted HIGH.
• In a CHI configuration, SINACT is asserted HIGH.
• If ACP has been configured, AINACTS is asserted HIGH.
• L2 memory system is idle.
L2FLUSHREQ Input L2 hardware flush request.
L2FLUSHDONE Output L2 hardware flush complete.
SMPEN[CN:0] Output Indicates whether a core is taking part in coherency.
DBGNOPWRDWN[CN:0] Output Processor no powerdown request
0
Do not request that the processor stays powered up.
1
Request that the processor stays powered up.
DBGPWRUPREQ[CN:0] Output Processor powerup request
0
Do not request processor to power up.
1
Request that the processor is not powered up.
DBGPWRDUP[CN:0] Input Processor powered up
0
Processor is powered down.
1
Processor is powered up.
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